SiteGuardian
EU-hosted continuous security, compliance & monitoring platform
Scope: TLS + DNS + email + headers + accessibility + cookies + compliance
Mozilla Observatory
HTTP response headers + basic TLS
Pricing: Free, no account required
Visit their site →Feature-by-feature
Each row verified against the competitor's public documentation.
| Capability | Mozilla Observatory | SiteGuardian |
|---|---|---|
| HTTP security headers score | Yes | Yes |
| Subresource Integrity (SRI) audit | Yes | Yes |
| Mixed-content detection | Yes | Yes |
| TLS depth (cipher suites, OCSP…) | Partial | Yes |
| TLS 1.3 0-RTT (early_data) detection | No | Yes |
| DNS / CAA / DNSSEC | No | Yes |
| Nameserver redundancy (RFC 2182) | No | Yes |
| Email authentication (SPF/DKIM/DMARC/BIMI) | No | Yes |
| MTA-STS + TLS-RPT | No | Yes |
| Accessibility (WCAG 2.2 / EAA) | No | Yes |
| Cookie / GDPR consent scanner | No | Yes |
| Continuous monitoring | No | Yes |
|
EU-hosted (GDPR-friendly)
Observatory runs on Mozilla infrastructure (US/global). |
No | Yes |
| Compliance mapping (NIS2, GDPR, DORA) | No | Yes |
When Mozilla Observatory is the better choice
We'd rather be honest than waste your time.
A quick pass/fail grade for the HTTP security headers on a single page.
- You want a simple A+/F grade for HTTP headers without signing up.
- You're teaching students about web-security basics.
- You don't need monitoring, DNS, email or compliance output.
When SiteGuardian is the better choice
- You want continuous monitoring and alerts, not one-off scans.
- You need EU data residency and GDPR-by-design processing.
- You need TLS + DNS + email + headers + accessibility + cookies in one report.
- You need findings mapped to NIS2, GDPR, DORA, DSA, EAA, CRA articles.
- You want to benchmark your score against 700k EU sites.
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