Compare · 2026
Glook vs Mozilla Observatory
Free security best practices checker from Mozilla with 47M+ scans
Mozilla Observatory audits security. Glook audits security plus everything else your site needs to be found by Google and AI.
Glook
$14/mo
Free tier — no credit card
Mozilla Observatory
Free
Paid plans only
Why Glook wins vs Mozilla Observatory
Full site audit vs security-only — Glook covers SEO, performance (Lighthouse), AI visibility, mobile readiness, and 90+ checks. Mozilla Observatory checks security best practices only.
AI visibility coverage — llms.txt, per-bot crawler access (GPTBot, ClaudeBot), schema.org, trust signals. Mozilla Observatory has none of this.
AI fix prompts — paste into Cursor or Claude Code immediately. Mozilla Observatory shows a score and grade but no code to fix issues.
Feature comparison
Try Glook free
No credit card required. Full report in under a minute.
What Mozilla Observatorydoesn't cover
- ⚠Security-only — no SEO, performance, AI visibility, or mobile checks
- ⚠No AI fix prompts — provides grades but not the code to fix issues
- ⚠No monitoring — single-run check only
- ⚠No Lighthouse or Core Web Vitals data
- ⚠No AI visibility checks whatsoever
Common questions about Glook vs Mozilla Observatory
Is Mozilla Observatory still relevant in 2026?
Mozilla Observatory remains a solid quick-check for HTTP security headers. Glook runs all the same security checks plus a full Lighthouse audit, AI visibility (llms.txt, AI crawlers, schema.org), SEO audit, and generates AI fix prompts for every issue — making it a complete replacement for Observatory plus much more.
Does Glook score the same security headers Mozilla Observatory does?
Yes. Glook checks CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and all headers Mozilla Observatory covers. It also adds SSL Labs TLS grading, cookie security flags, and detection of exposed secrets that Observatory does not audit.
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