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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
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
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
8.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
21.09 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
368 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.085
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
24.90 s
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Main Thread Breakdown
Downloaded but never executed on this page.
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
~1.7 MiB of savings available
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
No green hosting detected
Web fonts
5
518 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Fixing the unchecked items could save ~228 KB and ~456 ms
Unattributable takes 355ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
How third-party costs are calculated
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375 ms
750 ms
1.1 s
1.5 s
1.9 s