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Self-hosted, invisible CAPTCHA that detects AI agents driving real browsers. GDPR, WCAG 2.2 AA, and EAA: no cookies, no third-party data sharing, and no visual or audio puzzle. With a false-positive budget enforced in CI. Proof of work, drop-in for Turnstile and reCAPTCHA.
Open-source, frictionless CAPTCHA and bot defense. A privacy-focused alternative to reCAPTCHA and hCaptcha.
Very simple captcha with Rails 3 & 4 & 5 & 6 & 7 support
The PHP pragmatic forms library
Cloudflare Turnstile challenge internals: the live request flow, the challenge bundle, and a capture toolkit.
Text-based logic question captcha's for Rails 🚫🤖
Use a CAPTCHA challenge to protect DokuWiki against automated spam