Scanverra vs. Mozilla Observatory: Which Security Scanner Should You Use?

We build Scanverra, so read this with that in mind - but Mozilla Observatory is a genuinely good, credible free tool, and the honest answer to "which one should I use" is more nuanced than a marketing page would prefer. Here's the real comparison.

What Mozilla Observatory Does Well

Mozilla Observatory is a free, well-respected scanner focused specifically on HTTP security headers and TLS configuration. It grades your CSP, HSTS, and related headers, explains what each one does in plain language, and links to Mozilla's own documentation for fixing what it finds. It has no account requirement, no usage limits, and the backing/credibility of Mozilla behind it. For a fast, trustworthy first pass on header configuration specifically, it's hard to fault.

What Scanverra Does Differently

Observatory's scope is deliberately narrow - headers and TLS. Scanverra's security scan covers that same ground (headers, cookie flags, TLS/SSL setup) plus DNS record checks, exposed secrets detection, and common CSRF gaps, in a single ~30-second scan. It also sits inside the same platform as performance, SEO, accessibility, browser, and code-quality scanning - so a security scan isn't a separate tool with a separate login, it's one more result on a dashboard you already have open.

Feature Comparison

• Security header analysis - both tools cover this well; Observatory has a slight edge in explanatory depth per header.
• TLS/SSL configuration - both check this; neither goes as deep as a dedicated tool like Qualys SSL Labs.
• DNS record checks - Scanverra only.
• Exposed secrets detection - Scanverra only.
• CSRF configuration checks - Scanverra only.
• Combined with performance/SEO/accessibility scanning - Scanverra only; Observatory is a standalone single-purpose tool.
• Account required - neither, for a basic scan.
• Backing/track record - Observatory has the longer history and Mozilla's name behind it.

Which Should You Actually Use?

These aren't mutually exclusive, and running both costs nothing but a few minutes. If you want the fastest, most focused check of just your security headers from a name with a long track record, Observatory is a good, honest choice. If you want that same header check plus DNS, secrets, and CSRF coverage, in the same place you're already checking performance and SEO, that's the gap Scanverra is built to fill. For a lot of teams, the practical answer is: run Scanverra as your continuous, all-in-one check, and treat Observatory as a second opinion before anything sensitive goes live.