Alternatives

AcuityScan vs Mozilla Observatory

Mozilla Observatory is a respected, free security scanner. AcuityScan covers that security ground as one of eight scored categories.

Mozilla Observatory is a free, well-regarded tool that scores a site's web security configuration, security headers, cookies, TLS, and related best practices. It's a great free check for hardening. AcuityScan covers the same security surface inside its threat module, then reports it next to email, DNS, performance, SEO, accessibility, privacy, and mobile for a full-site view.

AcuityScan vs Mozilla Observatory, side by side

Free web security scanner.

	AcuityScan	Mozilla Observatory
Primary focus	Full website audit	Web security config
Categories covered	8	Security
Security headers grade	Yes	Yes (detailed)
TLS / cookie checks	Yes	Yes
Email auth + DNS + blacklists	Yes	No
Performance + SEO	Yes	No
Accessibility (WCAG)	Yes (axe-core)	No
Unified 0-100 health score	Yes	Security grade
Monitoring & alerts	Included in Pro	No
Starting paid tier	$29/mo	Free
Plain-English fix for every issue	Yes	No
Native Claude / MCP integration	Yes	No

Comparison based on Mozilla Observatory's publicly listed features and pricing as of 2026. Competitor capabilities change, so if anything here is outdated, let us know.

Where AcuityScan goes further

Security scored alongside seven other categories, not on its own.
Email authentication, blacklist checks, performance, and accessibility Observatory does not run.
Monitoring that re-checks your security posture over time.
A plain-English fix and shareable report for every finding.

When Mozilla Observatory is the better choice

We would rather you pick the right tool than the wrong one. Mozilla Observatory is the better fit when:

You want a free, focused security-configuration grade from a trusted source.
You're hardening one site's headers, cookies, and TLS and want security-specific feedback.
Security is the only category you're assessing right now.

Questions

Does AcuityScan cover what Mozilla Observatory checks?

Largely yes, AcuityScan grades security headers, TLS, cookies, and related best practices in its threat module. Observatory goes deep on security alone; AcuityScan reports it inside a full audit.

Is AcuityScan's security scan free?

Yes. The relevant standalone tools and the full scan run without an account. Paid tiers add monitoring and history.

Why scan more than security?

A hardened site can still fail email authentication, load slowly, or be inaccessible. AcuityScan scores security next to those so nothing hides.

See your own score.

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Mozilla Observatory is a trademark of its respective owner. AcuityScan is independent and is not affiliated with or endorsed by Mozilla Observatory. This comparison reflects publicly available information as of 2026 and may change, verify current features and pricing on each provider's own site.