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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| PageSpeed Insightspagespeed.web.dev | WebPageTestwebpagetest.org | Qualys SSL Labs Server Testssllabs.com | Security Headerssecurityheaders.com | |
|---|---|---|---|---|
| What it does | Scores a page on real-user Core Web Vitals and lab measurements | Loads your page from a chosen city and browser and films the result | Grades a site's TLS configuration from A+ down to F and says why | Grades the HTTP security headers a site sends and names the missing ones |
| What it costs you | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on their server |
| Where it stops | Field data is missing for low-traffic pages, and repeat lab runs vary by several points on unchanged code. | Free tests sit in a shared queue at busy times, and the results need interpreting rather than reading. | Results appear on a public board unless you opt out, and it only tests public hosts on port 443. | Checks that headers exist, not that they are correct — a permissive CSP still scores well. |
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| Category | Web, Domain & Network | Web, Domain & Network | Web, Domain & Network | Web, Domain & Network |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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