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Contrast Checker

Check WCAG color contrast ratios between any two colors

Inspect HTTP response headers for any URL

Analyze SSL/TLS certificate details and chain

Look up DNS records for any domain

Redirect Checker

Trace the full redirect chain for any URL

Real-user INP and Core Web Vitals from Google's Chrome UX Report.

RESTful API for programmatic website audits

Embed an auto-updating health score badge on your site

https://stackexchange.com

Accessibility

· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.

SCORE

65

GRADE

D

FIX

4

REVIEW

3

PASS

6

INFO

0

Checks

13

6 PASS 3 REVIEW 4 FIX

F

Favicon & Branding

Action

1 icon(s) detected

FIX

1 icon(s) detected

favicon.ico present at site root

No apple-touch-icon detected

iOS devices use this when users add your site to their home screen. Add <link rel='apple-touch-icon' sizes='180x180' href='/apple-touch-icon.png'>.

✓ favicon.ico Present

✗ PNG Icons Missing

✗ Apple Touch Missing

✗ SVG Favicon Missing

✗ Manifest Icons Missing

✗ Multiple Sizes Missing

D

Web Manifest

Action

Not found

FIX

Not found

No web manifest found

No manifest at standard paths (/manifest.json, /site.webmanifest). A manifest is optional but enables PWA features like home screen installation and standalone display.

No web manifest found.

D

Print Stylesheet

Action

No print styles

FIX

No print styles

No print-specific styles detected

When users print this page, they get the screen layout including navigation and non-essential elements. Add @media print rules to hide navigation and optimize layout for paper.

Print Stylesheet No Print Styles

Print stylesheet Not found ✗Inline @media print Not detected ✗

B

Landmark Structure

2 landmarks

REVIEW

2 landmarks

<main> landmark present

No <nav> landmark found

No banner (header) landmark

Skip navigation link is missing (WCAG 2.4.1)

Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.

Page Structure — as a screen reader sees it

Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.

Why this matters

Without a skip-nav link, keyboard users tab through every nav item before reaching content — every page, every visit.

Learn more ▾

WCAG 2.4.1 (Bypass Blocks) requires a mechanism to skip past repeated content. The standard implementation is a 'Skip to main content' link that's the first focusable element, visually hidden until focused. Three lines of HTML + four of CSS.

Source: WCAG 2.1 SC 2.4.1

B

Dark Mode Support

Dark mode detected

REVIEW

Dark mode detected

prefers-color-scheme CSS detected in inline styles

Detection limited to meta tags and inline styles

External CSS files may contain prefers-color-scheme rules not visible to this scan.

Dark Mode✓ Dark Mode Supported

color-scheme meta Not set ✗Dark theme-color Not set ✗CSS indicators Detected ✓

Detection limited to meta tags and inline styles.

B

Lighthouse Accessibility Audits

Score 80/100 — 6 failing, 22 passed

REVIEW

80

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.

ARIA

Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Search `div.s-topbar--container > form#search > div.s-topbar--searchbar--input-group > input.s-input`

These are opportunities to improve the usage of ARIA in your application which 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
hot `div#mainArea > div.subheader > div.tabs > a.youarehere`
4 answers \| asked 10 hours ago by vsz on scifi `div.question-container > div.question > div.metaInfo > span.va-middle`
by vsz on `div.question > div.metaInfo > span.va-middle > span.owner`
4 answers \| asked 13 hours ago by Erwann on tex `div.question-container > div.question > div.metaInfo > span.va-middle`
by Erwann on `div.question > div.metaInfo > span.va-middle > span.owner`
4 answers \| asked 18 hours ago by pie on matheducators `div.question-container > div.question > div.metaInfo > span.va-middle`
by pie on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 22 hours ago by Rafał Mach on mathoverflow `div.question-container > div.question > div.metaInfo > span.va-middle`
by Rafał Mach on `div.question > div.metaInfo > span.va-middle > span.owner`
1 answers \| asked 9 hours ago by RidiculousRichard on space `div.question-container > div.question > div.metaInfo > span.va-middle`
by RidiculousRichard on `div.question > div.metaInfo > span.va-middle > span.owner`
1 answers \| asked 17 hours ago by honestSalami on history `div.question-container > div.question > div.metaInfo > span.va-middle`
by honestSalami on `div.question > div.metaInfo > span.va-middle > span.owner`
3 answers \| asked 20 hours ago by Sebastiano on tex `div.question-container > div.question > div.metaInfo > span.va-middle`
by Sebastiano on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by Mike on rpg `div.question-container > div.question > div.metaInfo > span.va-middle`
by Mike on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by Italian Philosopher on politics `div.question-container > div.question > div.metaInfo > span.va-middle`
by Italian Philosopher on `div.question > div.metaInfo > span.va-middle > span.owner`
3 answers \| asked 14 hours ago by Rio C on puzzling `div.question-container > div.question > div.metaInfo > span.va-middle`
by Rio C on `div.question > div.metaInfo > span.va-middle > span.owner`
1 answers \| asked yesterday by Raj on scifi `div.question-container > div.question > div.metaInfo > span.va-middle`
by Raj on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 22 hours ago by karlh on tex `div.question-container > div.question > div.metaInfo > span.va-middle`
by karlh on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 21 hours ago by TomY on physics `div.question-container > div.question > div.metaInfo > span.va-middle`
by TomY on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 18 hours ago by Trevor on english `div.question-container > div.question > div.metaInfo > span.va-middle`
by Trevor on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 9 hours ago by Zachary Barbanell on crypto `div.question-container > div.question > div.metaInfo > span.va-middle`
by Zachary Barbanell on `div.question > div.metaInfo > span.va-middle > span.owner`
3 answers \| asked 22 hours ago by Alma Arjuna on math `div.question-container > div.question > div.metaInfo > span.va-middle`
by Alma Arjuna on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by Rajorshi Chattopadhyay on academia `div.question-container > div.question > div.metaInfo > span.va-middle`
by Rajorshi Chattopadhyay on `div.question > div.metaInfo > span.va-middle > span.owner`
1 answers \| asked 12 hours ago by robertspierre on superuser `div.question-container > div.question > div.metaInfo > span.va-middle`
by robertspierre on `div.question > div.metaInfo > span.va-middle > span.owner`
6 answers \| asked Apr 18 at 15:36 by Dmyt on worldbuilding `div.question-container > div.question > div.metaInfo > span.va-middle`
by Dmyt on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by Mike on rpg `div.question-container > div.question > div.metaInfo > span.va-middle`
by Mike on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by Jay Bee on space `div.question-container > div.question > div.metaInfo > span.va-middle`
by Jay Bee on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 18 hours ago by Student_Number_249812341 on physics `div.question-container > div.question > div.metaInfo > span.va-middle`
by Student_Number_249812341 on `div.question > div.metaInfo > span.va-middle > span.owner`
4 answers \| asked 2 days ago by qwerty on mathematica `div.question-container > div.question > div.metaInfo > span.va-middle`
by qwerty on `div.question > div.metaInfo > span.va-middle > span.owner`
7 answers \| asked 2 days ago by Alex on electronics `div.question-container > div.question > div.metaInfo > span.va-middle`
by Alex on `div.question > div.metaInfo > span.va-middle > span.owner`
1 answers \| asked 23 hours ago by Howard Hinnant on stackoverflow `div.question-container > div.question > div.metaInfo > span.va-middle`
by Howard Hinnant on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked yesterday by dsollen on law `div.question-container > div.question > div.metaInfo > span.va-middle`
by dsollen on `div.question > div.metaInfo > span.va-middle > span.owner`
9 answers \| asked 2 days ago by Syed on philosophy `div.question-container > div.question > div.metaInfo > span.va-middle`
by Syed on `div.question > div.metaInfo > span.va-middle > span.owner`
4 answers \| asked 2 days ago by Rean on academia `div.question-container > div.question > div.metaInfo > span.va-middle`
by Rean on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 15 hours ago by Vincent on tex `div.question-container > div.question > div.metaInfo > span.va-middle`
by Vincent on `div.question > div.metaInfo > span.va-middle > span.owner`
2 answers \| asked 20 hours ago by Joseph Rose on crafts `div.question-container > div.question > div.metaInfo > span.va-middle`
by Joseph Rose on `div.question > div.metaInfo > span.va-middle > span.owner`
per page `div#mainArea > div#question-list > div.page-sizer > span.page-numbers`
6.5k `div.featured-site > div.site-stats > div.stats-container > div.stats`
20k `div.featured-site > div.site-stats > div.stats-container > div.stats`
97% `div.featured-site > div.site-stats > div.stats-container > div.stats`
hot questions feed `section#content > div.contentWrapper > div#feed-link > a`
About `div.site-footer--col > ul.-list > li > a.js-gps-track`
Contact `div.site-footer--col > ul.-list > li > a.js-gps-track`
Feedback `div.site-footer--col > ul.-list > li > a.js-gps-track`
Stack Overflow `div.site-footer--col > ul.-list > li > a.js-gps-track`
Stack Internal `div.site-footer--col > ul.-list > li > a.js-gps-track`
Stack Data Licensing `div.site-footer--col > ul.-list > li > a.js-gps-track`
Stack Ads `div.site-footer--col > ul.-list > li > a.js-gps-track`
Press `div.site-footer--col > ul.-list > li > a.js-gps-track`
Legal `div.site-footer--col > ul.-list > li > a.js-gps-track`
Privacy Policy `div.site-footer--col > ul.-list > li > a.js-gps-track`
Terms of Service `div.site-footer--col > ul.-list > li > a.js-gps-track`
Cookie Settings `div.site-footer--col > ul.-list > li#consent-footer-link > button.s-btn`
Cookie Policy `div.site-footer--col > ul.-list > li > a.js-gps-track`
Technology `div > ul.-list > li > a.-link`
Culture & recreation `div > ul.-list > li > a.-link`
Life & arts `div > ul.-list > li > a.-link`
Science `div > ul.-list > li > a.-link`
Professional `div > ul.-list > li > a.-link`
Business `div > ul.-list > li > a.-link`
API `div > ul.-list > li.mt16 > a.-link`
Data `div > ul.-list > li > a.-link`
Blog `div.site-footer--copyright > ul.-list > li > a.js-gps-track`
Facebook `div.site-footer--copyright > ul.-list > li > a.-link`
Twitter `div.site-footer--copyright > ul.-list > li > a.-link`
LinkedIn `div.site-footer--copyright > ul.-list > li > a.-link`
Instagram `div.site-footer--copyright > ul.-list > li > a.-link`
Site design / logo © 2026 Stack Exchange Inc; `div.site-footer--container > div.site-footer--copyright > p.md:mb0 > span`
user contributions licensed under `div.site-footer--container > div.site-footer--copyright > p.md:mb0 > span`
CC BY-SA `div.site-footer--container > div.site-footer--copyright > p.md:mb0 > a.-link`
rev 2026.4.21.42306 `div.site-footer--container > div.site-footer--copyright > p.md:mb0 > span#svnrev`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Stack Exchange Q&A communities are different. Here's how: `div.hero-box > div.row > div.text > h3.title`
STACK EXCHANGE `div.site-footer--container > nav.site-footer--nav > div.site-footer--col > h5.-title`

These are opportunities to improve keyboard navigation in your application.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.wrapper > header.s-topbar > div.s-topbar--container > a.s-topbar--logo `div.wrapper > header.s-topbar > div.s-topbar--container > a.s-topbar--logo`

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.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Tour `header.s-topbar > div.s-topbar--container > ol.s-navigation > li`
About Us `header.s-topbar > div.s-topbar--container > ol.s-navigation > li`
Meta `header.s-topbar > div.s-topbar--container > ol.s-navigation > li`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○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]` values are valid

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

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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

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

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

●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 are distinguishable without relying on color.

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

●Touch targets have sufficient size and spacing.

●Skip links are focusable.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

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

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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

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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○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.

○`<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.

○Elements with visible text labels have matching accessible names.

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

○`<td>` elements in a large `<table>` have one or more table headers.

A+

Heading Hierarchy

3 headings

PASS

3 headings

Single H1 present

H1 stackexchange.com
H2 Performing security verification
H2 Verification successful. Waiting for stackexchange.com to respond

A+

Alt Text Quality

No images

PASS

No images

No images on this page

No images on this page.

A+

Form Accessibility

No form controls

PASS

No form controls

No form controls on this page

No form controls found.

A

Link & Button Quality

2 links, 0 buttons — all OK

PASS

2 links, 0 buttons — all OK

2 link(s) open in new tab without warning

Add '(opens in new tab)' to link text or aria-label.

Got: https://www.cloudflare.com?utm_source=challenge&utm_campaign=m; https://www.cloudflare.com/privacypolicy/

2 links

0 empty

0 generic text

2 new tab

0 empty buttons

Element	Text	Issue	Suggested Fix
https://www.cloudflare.com?utm_source=ch…	Cloudflare	new tab	Add '(opens in new tab)' to text
https://www.cloudflare.com/privacypolicy…	Privacy	new tab	Add '(opens in new tab)' to text

Add '(opens in new tab)' to link text or aria-label.

https://www.cloudflare.com?utm_source=challenge&utm_campaign=m; https://www.cloudflare.com/privacypolicy/

Why this matters

Links with target="_blank" without rel="noopener" leak the originating page's window context — security and UX issue.

Learn more ▾

Without rel="noopener", the new tab can navigate the original tab via window.opener (tab-nabbing attack). Modern browsers default to noopener for target=_blank but only since recent versions. Always set rel="noopener noreferrer" explicitly.

Source: MDN target / OWASP

A

404 Error Page

HTTP 404, custom page

PASS

HTTP 404, custom page

Correct 404 status code returned

Got: HTTP 404

Custom styled 404 page

Navigation links present on 404 page

Homepage link present on 404 page

Search form present on 404 page

404 Page Quality ✓ Custom 404 Page

Status Code HTTP 404 ✓Page Title Page Not Found ✓Custom Styling ✓Navigation ✓Homepage Link ✓Search Form ✓

A+

Color Contrast (Screenshot)

10 text elements analyzed, 0 fail WCAG AA

PASS

Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.

10 pass

Show all checked elements (10)

Element	Ratio	Required	FG	BG	Result
h1 stackexchange.com	21.00:1	3.0:1	#000000	#FFFFFF	Pass
h2 Performing security …	21.00:1	3.0:1	#000000	#FFFFFF	Pass
h2 Verification success…	21.00:1	3.0:1	#000000	#FFFFFF	Pass
title Just a moment...	21.00:1	4.5:1	#000000	#FFFFFF	Pass
p This website uses a …	21.00:1	4.5:1	#000000	#FFFFFF	Pass
div Ray ID:	21.00:1	4.5:1	#000000	#FFFFFF	Pass
code 9efe9f4fab157746	21.00:1	4.5:1	#000000	#FFFFFF	Pass
span Performance and Secu…	21.00:1	4.5:1	#000000	#FFFFFF	Pass
a Cloudflare	21.00:1	4.5:1	#000000	#FFFFFF	Pass
a Privacy	21.00:1	4.5:1	#000000	#FFFFFF	Pass

Methodology: The top 20 text elements by font size were checked. Background color was sampled from the desktop screenshot using a 5-point pattern. WCAG 2.1 AA requires 4.5:1 for normal text and 3:1 for large text.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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