Pre-deployment frontend quality check

Audit before you deploy.

Analyze HTML, CSS and JavaScript in seconds. Detect SEO, accessibility, performance and best-practice issues before publishing.

audit.html

<html>
  <head>
    <title></title>
  </head>
  <body>
    <h1>Welcome</h1>
    <h1>Products</h1>
    <img src="/hero.jpg">
    <input placeholder="Email">
    <script src="/app.js"></script>
  </body>
</html>

SEONeeds attention

A11yCritical

PerformanceNeeds attention

Best PracticesNeeds attention

The Tool

Paste. Audit. Ship.

Works with plain HTML, CSS or JavaScript. Nothing leaves your browser until you share a report.

audit.html

0 chars · 1 lines · auto-saved

What you get

Four lenses. One pre-flight checklist.

Frontend Auditor isn't a replacement for Lighthouse — it's the final pass before you hit publish, surfacing the issues real teams ship every day.

SEO

Titles, descriptions, headings, empty links, viewport.

Accessibility

Labels, alt text, ARIA, heading order, contrast.

Performance

Render-blocking scripts, DOM depth, lazy images.

Best Practices

Duplicate IDs, inline handlers, deprecated tags.