Free outside-in tools
Free Website Security Tools
Choose a focused entry point, enter a domain you own or are authorized to assess, and review the full public-evidence report produced by the Sentryx scan backend.
Free SSL Certificate Checker
Check a domain's public TLS certificate, expiry, hostname coverage, and HTTPS evidence, then review the complete outside-in report.
Free DNS Checker
Check public DNS records and outside-in security signals for a domain, then review changes and monitoring options.
Free DMARC Checker
Check whether a domain publishes a DMARC record and understand p=none, p=quarantine, p=reject, SPF, and DKIM alignment.
Free Security Header Checker
Check observable HTTP security headers such as HSTS and CSP without logging in or storing response bodies.
Free TLS Checker
Check public TLS and HTTPS evidence for a domain, including certificate health and observable protocol behavior.
Free Domain Security Checker
Run a read-only outside-in domain security check across public hosts, DNS, HTTPS, TLS, email security, and baseline headers.