DEVELOPER TOOLKIT
FREE SECURITY TOOLS
Instant security checks for your domain. No signup, no limits, no BS.
SSL CERTIFICATE CHECKER
Check SSL/TLS certificate validity, protocol support, and security grade.
EMAIL SECURITY CHECKER
Analyze SPF, DKIM, and DMARC email authentication records.
DNS SECURITY CHECKER
Verify DNSSEC, CAA records, nameservers, and DNS health.
SECURITY.TXT VALIDATOR
Validate your security.txt file against RFC 9116 standard.
WANT THE FULL PICTURE?
These tools check individual aspects. Start with 149 bounded public checks. Current ownership verification unlocks the 428-check surface suite. The 721-check full suite requires current ownership proof plus explicit active-testing authorization.
RUN BOUNDED PUBLIC CHECKAll tools are free, unlimited, and require no signup. Your data is never stored.