What is Mozilla Observatory?
Mozilla Observatory is a free, public tool that grades a website's HTTP security (headers, cookies, redirects and related best practices). Since moving to MDN as the HTTP Observatory it no longer tests TLS. It runs on-demand scans and provides a score and recommendations.
Comparison at a glance
| Aspect | Barrion | Mozilla Observatory |
|---|---|---|
| Frequency | Continuous, scheduled scans, alerts on change | On-demand, run when you visit the site |
| Output | Per-check results, step-by-step fixes, PDF/CSV export, history | Single grade (A to F), category scores, written recommendations |
| Scope | Headers, TLS, cookies, mixed content, email config, exposure, 35+ passive checks on paid plans | HTTP headers, cookies, redirects and related best practices (no TLS checks) |
| Remediation | Step-by-step fixes per finding, stack-specific guidance | Recommendations and links to docs |
| Audit / compliance | Scan history, trends, export for auditors | Public scan history per domain, no alerts |
| Pricing | Free tier, paid for monitoring and alerts | Free |
| Continuous AI pentest, checked against the live app | Yes. AI agents test your app on a schedule or on demand, and findings are checked against the live app before the report | No. An on-demand grade of HTTP headers, with no attack traffic |
Mozilla Observatory facts checked 2026-09-26 on the vendor's own site: HTTP Observatory FAQ.
Who Barrion is best for
Teams that want to move from occasional checks to continuous assurance, get alerts when config drifts, and need exportable evidence for audits or compliance.
Who Mozilla Observatory is best for
Anyone who wants a quick, free check of their HTTP headers. Great for a first pass or ad-hoc validation.
Frequently asked questions
Is Barrion a replacement for Mozilla Observatory?
For ongoing coverage, yes. Observatory gives an on-demand grade for HTTP headers. Barrion runs scheduled scans, alerts on change, gives per-check fixes, and keeps history. If you only need the occasional snapshot, Observatory is fine. If you want continuous coverage, Barrion is the upgrade path.
Can I use Barrion and Mozilla Observatory together?
Yes. Many teams use Observatory for a quick public grade and Barrion for continuous monitoring, alerts, and audit-ready evidence. They are not in conflict, just different in scope and cadence.
How is Barrion priced vs Mozilla Observatory?
Observatory is free. Barrion has a free tier with core checks and paid plans for monitoring and alerts. You pay Barrion for continuous coverage, exportable history, and step-by-step fixes that Observatory does not provide.
Does Barrion test in production safely?
Yes. Barrion runs passive, read-only checks against your public endpoints, so it is safe to run continuously in production. Observatory is also non-invasive but runs only when you trigger it.
Summary
Observatory is a solid free starting point. Barrion adds continuous monitoring, alerts, fix guidance, and audit-ready history. If you only need an occasional grade, Observatory may be enough. If you want ongoing assurance and evidence, Barrion is the next step.
Explore Barrion further
Try the same checks Mozilla Observatory runs against your own site with the free website security scan (no signup), browse our full tool catalog covering TLS, security headers, CSP, cookies, DNS, and email auth, or read per-check explainers in /learn for the background on what each test means and why it matters. If you want a deeper look at how Barrion stacks up across the market, the full Barrion vs competitors comparison walks through the trade-offs in one place, and the pricing page shows what's included in each plan.