Free tool
Security headers check
A fast, non-intrusive grade of the HTTP security headers your origin serves. We fetch your URL, inspect every major security header, and return a letter grade plus a list of specific issues and what to do about each.
Typical run time: Under 5 seconds
We fetch your URL once, read its response headers, and grade them. Nothing is stored on our side.
More free tools
Performance check
Measure Core Web Vitals on your site using Google Lighthouse — LCP, INP, CLS and more.
Try itAccessibility check
A 60-second accessibility scan — Lighthouse score plus our own static HTML checks, framed against WCAG 2.2.
Try itColour contrast checker
Test foreground / background colour combinations against WCAG 2.1 and 2.2, with a nearest-passing-colour suggestion.
Try it