Mozilla Observatory Alternatives 2026 — Enterno, Hardenize

Enterno.io Editorial Team

Mozilla Observatory Alternatives

By Anatoly Oshmanovsky · Updated Apr 17, 2026

Key idea:

Mozilla Observatory (observatory.mozilla.org) has been an open-source web security analyzer since 2016. Built by Mozilla Foundation, covers HTTP headers, CSP, redirection, CAA, SRI. 2026 pain points: no monitoring (one-shot only), no API in the open-source v2, minimalist UI without action items. Alternatives: Enterno.io Security Scanner, SecurityHeaders.com, Hardenize, ImmuniWeb.

Below: competitor overview, feature-by-feature comparison, when Enterno.io wins, FAQ.

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About the Competitor

Mozilla Observatory was built by Mozilla Foundation in 2016. Open-source (GitHub mozilla/http-observatory). Grade A+ to F. 11 tests: HTTP headers + SRI + CAA + Redirection. Free, but no continuous monitoring, no API in v2.

Enterno.io vs Competitor — Feature Comparison

Feature	Enterno.io	Competitor
HTTP security header grade	✅	✅
CAA record analysis	⚠️	✅
Subresource Integrity (SRI)	⚠️	✅
Continuous monitoring	✅	❌
Action items (how to fix)	✅	⚠️
Automation API	✅ Pro	❌
RU localisation	✅	❌
Cost	Free + Pro	Free (open-source)

When to Pick Enterno.io

You need automation — Mozilla Observatory v2 removed the public API
You want continuous monitoring and alerts
You want a UI with clear remediation items
If you want to self-host open-source — Observatory is ideal

HeadersCSP, HSTS, X-Frame-Options, etc.

SSL/TLSEncryption and certificate

ConfigurationServer settings and leaks

Grade A-FOverall security score

Why teams trust us

OWASP

guidelines

15+

security headers

<2s

result

A–F

security grade

How it works

Enter site URL

Security headers analyzed

Get grade A–F

What Does the Security Analysis Check?

The tool checks HTTP security headers, SSL/TLS configuration, server info leaks, and protection against common attacks (XSS, clickjacking, MIME sniffing). A grade fromA to F shows overall security level.

Header Analysis

Checking Content-Security-Policy, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and more.

SSL Check

TLS version, certificate expiry, chain of trust, HSTS support.

Leak Detection

Finding exposed server versions, debug modes, open configs, and directories.

Report with Recommendations

Detailed report explaining each issue with specific steps to fix it.

Who uses this

Security teams

HTTP header audit

DevOps

config verification

Developers

CSP & HSTS setup

Auditors

compliance checks

Common Mistakes

❌

Missing Content-Security-PolicyCSP is the primary XSS defense. Without it, script injection is much easier.

❌

Missing HSTS headerWithout HSTS, HTTPS-to-HTTP downgrade attacks are possible. Enable Strict-Transport-Security.

❌

Server header exposes versionServer: Apache/2.4.52 helps attackers find exploits. Hide the version.

❌

X-Frame-Options not setSite can be embedded in iframe for clickjacking. Set DENY or SAMEORIGIN.

❌

Missing X-Content-Type-OptionsWithout nosniff, browsers may misinterpret file types (MIME sniffing).

Best Practices

✓

Start with basic headersMinimum: HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy. Takes 5 minutes.

✓

Implement CSP graduallyStart with Content-Security-Policy-Report-Only, monitor violations, then enforce.

✓

Hide server headersRemove Server, X-Powered-By, X-AspNet-Version from responses.

✓

Configure Permissions-PolicyRestrict camera, microphone, geolocation access — only what is actually used.

✓

Check after every deploySecurity headers can be overwritten during server configuration updates.

Get more with a free account

Security check history and HTTP security header monitoring.

Learn more

How-to

Glossary

Research

Alternatives

Frequently Asked Questions

Mozilla Observatory v2 — what changed?

In 2024 Mozilla rewrote it in Python 3, dropping the API and scan history. It is now a web UI for one-off checks only. That narrowed applicability.

Can I self-host Mozilla Observatory?

Yes. GitHub: mozilla/http-observatory. Needs Python + PostgreSQL. 2-4 hours to set up.

Do Enterno and Observatory complement each other?

Yes. Observatory = deeper static analysis of individual headers. Enterno = continuous monitoring + broader scope (cookies, TLS, CORS).

Is the Observatory grade equivalent to Enterno?

The algorithm differs (Observatory strict-scoring, Enterno weighted). Grade A on Observatory ≈ A- on Enterno. Both flag critical issues consistently.