B — https://lichess.org | BeaverCheck Audit

Site Health

Score: 80 / 100

Based on 8 categories, 0 sections

Fast site — your users get a smooth experience.

Good foundation, but a few gaps could be exploited.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Solid infrastructure — fast server responses across the board.

Mostly compliant — a few items need attention.

Good content signals with minor gaps.

Lean and efficient — low environmental impact per visit.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Cloudflare · 1894 peers

You 80

Avg 74

+6 above average

0 50 100

Better than 92% of Cloudflare sites See full Cloudflare benchmark →

Google Play app · 169 peers

You 80

Avg 73

+7 above average

0 50 100

Better than 98% of Google Play app sites See full Google Play app benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

10 image(s) missing alt attribute

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality

10 image-in-link without alt text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Alt Text Quality

2 button(s) with no accessible text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Flichess.org)](https://beavercheck.com/results/ec163b57-46f4-4879-9fbd-7af87758a5f4)

HTML

<a href="https://beavercheck.com/results/ec163b57-46f4-4879-9fbd-7af87758a5f4"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Flichess.org" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Flichess.org

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Addressing the critical issues below would have the most immediate impact on your user trust.

2 security gaps detected — browsers may warn visitors about your site.

3 accessibility issues exclude users who rely on assistive technology.

Conversion Barriers

1 critical 4 warning

5 barrier(s) likely increasing bounce by ~22%.

Speed (1)

Page takes 4.9s to load

+12% bounce

Users abandon at ~3s — you're 2.4s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Trust (1)

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Content (1)

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Navigation (2)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

1 broken link(s) on the page

+2% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

£413 investment → £2,875/month returns + GBP 18,050,000 risk avoided

Payback period: < 1 month First-year ROI: +8262%

Investment

£413

6h · 5 findings

Monthly returns

£2,875 /mo

~£34,495 / year

Conversions recovered £2,874
Bandwidth savings £0.11

Regulatory risk avoided

GBP 18,050,000

if kept compliant

UK GDPR GBP 17,500,000
PECR GBP 500,000
Equality Act 2010 GBP 50,000

Payback period

0 12mo 24mo

£75 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

£413

5.5 developer hours at £75/hr

Based on United Kingdom rates (£75/hr)

Quick wins

£75 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

£ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

£1,504,167 / month at risk

~£18,050,001 / year if left unfixed

Compliance Risk

£18,050,000

UK GDPRPECREquality Act 2010

No privacy policy link detected
UK GDPR: GBP 10,000 – GBP 17,500,000
Trackers detected but no cookie policy found
UK GDPR: GBP 10,000 – GBP 17,500,000
Trackers detected but no cookie policy found
PECR: GBP 1,000 – GBP 500,000

+5 more

Bandwidth Waste

£0.11 /mo

1754.8 MB/mo × 0.063 GBP/GB

Optimize transfer: save ~175 KB per page load
Saves £0.11/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.90 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

4.89 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.90 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

4.90 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
lichess1.org/assets/css/lobby.ad862683.css	7.2 KiB	805 ms
lichess1.org/assets/css/site.5a923922.css	10.5 KiB	964 ms
lichess1.org/assets/css/lib.theme.all.1689358c.css	5.8 KiB	805 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
Woman looking through magnifying glass `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`	/display?fmt=webp&h=250&op=thumbnail&path=LaMJfBLx3j96.we...	12.3 KiB	9.2 KiB
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`	/display?fmt=webp&h=250&op=thumbnail&path=ZODj-wMq0_B8.we...	9.0 KiB	6.8 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages with WebSocket cannot enter back/forward cache.	Pending browser support
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because WebSocket has been used.	Not actionable

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Use efficient cache lifetimes

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 30 ms

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 571 KiB

●JavaScript execution time 0.2 s

●Minimizes main-thread work 1.3 s

●Avoid long main-thread tasks 5 long tasks found

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 40 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__prev `main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__prev`
main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__next `main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__next`

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
REGISTER `header#top > div.site-buttons > div.signin-or-signup > a.button`
31 hours ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
45 hours ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
2 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
2 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
3 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
3 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
4 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
All updates » `div.daily-feed__updates > div.daily-feed__update > div > a.daily-feed__update__day`
≤2000 Bullet `tbody > tr > td > a.text`
Hourly SuperBlitz `tbody > tr > td > a.text`
Hourly HyperBullet `tbody > tr > td > a.text`
Hourly Blitz `tbody > tr > td > a.text`
≤1500 Blitz `tbody > tr > td > a.text`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Chess Digital League Final `div.daily-feed__update > div > p > a`
UAE Chess Federation `div.daily-feed__update > div > p > a`
Watch the interview on YouTube `div.daily-feed__update > div > p > a`
Roman Dehtiarov `div.daily-feed__update > div > p > a`
European Individual Chess Championship 2026 `div.daily-feed__update > div > p > a`
@GlasnostPerestroika `div.daily-feed__update > div > p > a`
2026 Spring Marathon `div.daily-feed__update > div > p > a`
Dimitrios Makridis `div.daily-feed__update > div > p > a`
next Marathon `div.daily-feed__update > div > p > a`
Watch the interview on YouTube `div.daily-feed__update > div > p > a`
YouTube `div.daily-feed__update > div > p > a`
Twitch `div.daily-feed__update > div > p > a`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Streamers » `main.lobby > div.lobby__side > section.lobby__streams > a.more`

These items highlight common accessibility best practices.

Screen readers have features to make navigating tables easier. Ensuring that `<td>` elements in a large table (3 or more cells in width and height) have an associated table header may improve the experience for screen reader users. Learn more about table headers.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Philidor Defense Rapid 1h 57m 165 ≤2000 Bullet 27m 130 Hourly Atomic 27m … `div.lobby__tournaments-simuls > div.lobby__tournaments > div.lobby__box__content > table.tournaments`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●No element has a `[tabindex]` value greater than 0

●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`[accesskey]` values are unique

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Ensure proper origin isolation with COOP

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
header#top > div.site-buttons > div#clinput > a.link `header#top > div.site-buttons > div#clinput > a.link`

To appear in search results, crawlers need access to your app.

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.28 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.86 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.28 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.86 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
lichess1.org/assets/css/site.5a923922.css	10.5 KiB	285 ms
lichess1.org/assets/css/lobby.ad862683.css	7.2 KiB	285 ms
lichess1.org/assets/css/lib.theme.all.1689358c.css	5.8 KiB	285 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`	/display?fmt=webp&h=250&op=thumbnail&path=ZODj-wMq0_B8.we...	9.0 KiB	6.6 KiB
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`	/display?fmt=webp&h=250&op=thumbnail&path=NPLNItREDsv-.we...	7.0 KiB	5.1 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
Pages with WebSocket cannot enter back/forward cache.	Pending browser support
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because WebSocket has been used.	Not actionable

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Time to Interactive 1.9 s

●Use efficient cache lifetimes

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●LCP request discovery

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 571 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.5 s

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 80 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 40 ms

○INP breakdown

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__prev `main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__prev`
main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__next `main.lobby > div.lobby__blog > div.carousel__controls > button.carousel__next`

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
REGISTER `header#top > div.site-buttons > div.signin-or-signup > a.button`
31 hours ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
45 hours ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
2 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
2 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
3 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
3 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
4 days ago `div.daily-feed__update > div > a.daily-feed__update__day > time.set`
All updates » `div.daily-feed__updates > div.daily-feed__update > div > a.daily-feed__update__day`
≤2000 Bullet `tbody > tr > td > a.text`
Hourly SuperBlitz `tbody > tr > td > a.text`
Hourly HyperBullet `tbody > tr > td > a.text`
Hourly Blitz `tbody > tr > td > a.text`
≤1500 Blitz `tbody > tr > td > a.text`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Chess Digital League Final `div.daily-feed__update > div > p > a`
UAE Chess Federation `div.daily-feed__update > div > p > a`
Watch the interview on YouTube `div.daily-feed__update > div > p > a`
Roman Dehtiarov `div.daily-feed__update > div > p > a`
European Individual Chess Championship 2026 `div.daily-feed__update > div > p > a`
@GlasnostPerestroika `div.daily-feed__update > div > p > a`
2026 Spring Marathon `div.daily-feed__update > div > p > a`
Dimitrios Makridis `div.daily-feed__update > div > p > a`
next Marathon `div.daily-feed__update > div > p > a`
Watch the interview on YouTube `div.daily-feed__update > div > p > a`
YouTube `div.daily-feed__update > div > p > a`
Twitch `div.daily-feed__update > div > p > a`

These are opportunities to improve the legibility of your content.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
51,812 players `main.lobby > div.lobby__table > div.lobby__counters > a`
21,929 games in play `main.lobby > div.lobby__table > div.lobby__counters > a`

These items highlight common accessibility best practices.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Philidor Defense Rapid 41 minutes remaining 1h 57m 166 ≤2000 Bullet 11 minut… `div.lobby__tournaments-simuls > div.lobby__tournaments > div.lobby__box__content > table.tournaments`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●No element has a `[tabindex]` value greater than 0

●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`[accesskey]` values are unique

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Ensure proper origin isolation with COOP

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

SEO

Crawling and Indexing

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
header#top > div.site-buttons > div#clinput > a.link `header#top > div.site-buttons > div#clinput > a.link`

To appear in search results, crawlers need access to your app.

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`
div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image `div.carousel__track > a.ublog-post-card > span.ublog-post-card__top > img.ublog-post-image`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://lichess.org

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (1)

Trust (1)

Content (1)

Navigation (2)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Contrast

Best practices

Best Practices

SEO

Crawling and Indexing

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Contrast

Best practices

Best Practices

SEO

Crawling and Indexing

Content Best Practices

Keyboard Shortcuts