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Building Perimeter — daily security and accessibility monitoring for websites.

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Gone streaking
Gone streaking

Maker History

  • Perimeter
    PerimeterCheck your site's TLS, headers, DNS and accessibility
    Aug 2026
  • 🎉
    Joined Product HuntAugust 25th, 2026

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20h ago

Perimeter - Check your site's TLS, headers, DNS and accessibility

Most website problems stay invisible until they cost you: a certificate quietly expires because auto-renewal broke, a deploy drops a security header, a redesign ships images with no alt text. Perimeter checks four things in one scan and grades them — TLS certificate, security headers, DNS/email auth (SPF/DMARC), and WCAG accessibility. Free, no signup. Paid plans re-check daily, alert you when something breaks, and show how to fix each finding. Compliance adds a dated, auditor-ready report.
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