Skip to main content

Confirm

Are you sure?

Compare

SSL Labs, securityheaders.com and PageSpeed, in one scheduled report

They are excellent free tools. They also test one thing, for one URL, once. Full Stack Audit runs the same kinds of tests together, on a schedule, and tells you when a result gets worse.

The free testers in short

Qualys SSL Labs grades a server's TLS setup in depth, down to every cipher suite and how dozens of real clients would connect. securityheaders.com grades the HTTP security headers of a single response. PageSpeed Insights runs Lighthouse on one page and shows the Core Web Vitals Google has collected from real visitors. All three are free and need no account.

What they don't do is remember. Every run is a one-off, so a certificate that is about to expire, a header lost in a deploy or a slipping Lighthouse score goes unnoticed until somebody thinks of testing again. Full Stack Audit checks TLS, security headers and Lighthouse alongside SEO, email authentication, DNS and accessibility, re-runs them on a schedule and emails you when a passing check starts failing.

Feature by feature

Feature comparison
FeatureFull Stack AuditSSL Labs + securityheaders.com + PageSpeed
Security headers and TLS configuration
YesHSTS, CSP and other headers, TLS versions and grade, certificate validity
YesSSL Labs and securityheaders.com, one host at a time
Lighthouse and Core Web Vitals
YesLighthouse in real Chrome, Core Web Vitals from Chrome UX Report data
YesPageSpeed Insights, one page at a time
SEO: titles, canonicals, robots.txt, sitemaps, structured data
Yes
PartlyThe Lighthouse SEO score in PageSpeed Insights
Email authentication: SPF, DKIM, DMARC
YesPlus BIMI and MTA-STS
No
DNS and domain expiry
YesDNSSEC, CAA, nameservers and domain expiry
No
Broken links and redirects
Yes
No
Uptime checks every minute
No
No
Cron jobs, servers and status pages
No
No
Scheduled re-checks
YesWeekly, every two weeks or monthly on the Free plan
NoYou re-run each test by hand
Alerts
YesEmail, when a passing check starts failing
No
API and AI agents
YesMCP server for AI agents such as Claude or Cursor
PartlyPer-test APIs, no history
Price
YesFree plan for one site
YesFree

Other tools' features and prices as listed on their own websites on October 30, 2026. Prices exclude VAT.

Stick with the free testers if

  • You need a one-off answer about a single host or page, right now.
  • You are tuning TLS and need SSL Labs' cipher-by-cipher and client-by-client detail.
  • You don't need anyone to tell you when a result changes.

Pick Full Stack Audit if

  • You keep forgetting to re-run the tests until something has already broken.
  • You want TLS, headers, Lighthouse, SEO, email and DNS in one report per site.
  • You want an email when a check that used to pass starts failing.

Audit your site free and compare the results yourself

Run all 126 checks on your own site, then put the report next to the tools you use today.

Or run a free quick check first, no account needed

More comparisons