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Capjs
Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry.
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HCaptcha
A curated collection of the best open source alternatives to hCaptcha. Each listing includes a website screenshot along with a detailed review of its features.
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mCaptcha
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
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ALTCHA
ALTCHA offers cutting-edge spam and abuse protection for websites and apps, with privacy-friendly CAPTCHA alternatives designed for GDPR compliance.
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Procaptcha
A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications.
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Privatecaptcha
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
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