SecurityHeaders.com Alternative
SecurityHeaders.com popularized header grading — but after the Snyk acquisition, its API is being discontinued in April 2026, and it has always been a one-off scanner. HTTPS Checker scans the same headers (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) as part of a full HTTPS report with an A+–F grade — and can keep watching your domain, emailing you when a deploy silently drops a header.
A scanner tells you how things looked when you remembered to check. A monitor tells you when they change. You get both here — free scan below, no signup.
Enter any domain — headers, grade, certificate and redirects in seconds.
HTTPS Checker vs SecurityHeaders.com
| Feature | HTTPS Checker | SecurityHeaders.com |
|---|---|---|
| Security headers scan (HSTS, CSP, X-Frame-Options, …) | Yes | Yes |
| Letter grade (A+ to F) | Yes | Yes |
| Continuous monitoring with email alerts on changes | Yes | No |
| SSL certificate, expiry & TLS versions in the same report | Yes | No |
| HTTP → HTTPS redirect chain | Yes | No |
| HTTP/2 & HTTP/3 (QUIC) | Yes | No |
| Certificate Transparency alerts (new cert issued) | Paid plans | No |
| Bulk check | Up to 10 domains | No |
| Public JSON API | Yes | Sunset April 2026 |
| PDF / JSON export | Yes | No |
Alerts on regressions
A framework update removes your CSP, a CDN change drops HSTS — your site keeps working, so nobody notices. Monitoring emails you when any of the six headers appears or disappears, or your grade drops.
More than headers
The same report covers the SSL certificate and expiry, TLS versions, redirect chain, HTTP/2 and HTTP/3, mixed content, CAA and DNSSEC — one grade for your whole HTTPS setup. Paid plans add Certificate Transparency alerts when anyone issues a certificate for your domain.
API that stays
Replacing the SecurityHeaders.com API? Our free public API returns the full report — headers, grade, certificate — as JSON for CI pipelines and dashboards. See the API docs.
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