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Qualys SSL Labs
Free public TLS/SSL grading service — de-facto standard for cipher and config audit.
Free tier: fully free public TLS/SSL audit
What it does well
- Provides an exhaustive, detailed report on certificate, protocol, and cipher suite configuration.
- The simple letter-grade summary (A+, A, B, etc.) is a widely recognized industry benchmark.
- Completely free for public use with no registration required for its primary function.
Where it falls short
- Only scans publicly accessible servers; cannot be used for internal or firewalled systems.
- Lacks features for continuous monitoring, alerting, or historical performance tracking.
- Scans can be slow, sometimes taking several minutes to complete for a single host.
Alternatives to Qualys SSL Labs
Free HTTP security header grader — checks CSP, HSTS, X-Frame-Options, cookies.
Snyk
freemiumDeveloper-first SCA + SAST — Git/IDE/CI integration, generous free tier, paid Team from $25/dev/mo.
Pentest-Tools.com
freemiumOnline toolkit of 25+ pentest scanners (web, network, recon) — paid plans from $93/mo with unlimited scans.
Wordfence
freemiumWordPress endpoint security plugin — most installed WP firewall, paid Premium from $119/yr per site.