Cap
Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry.
6,197
Unknown
Alternative to: hCaptcha
BackPage 1 of 1
Best alternative software
Best Open Source hCaptcha Alternatives
Privacy-focused CAPTCHA service that protects websites from bots and spam while respecting user data and offering machine learning training rewards.
hCaptcha6 tools
Open-source tools
Showing 6 of 6 curated projects from this topic.
mCaptcha
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
2,445
AGPL-3.0
Alternative to: hCaptcha
ALTCHA
ALTCHA offers cutting-edge spam and abuse protection for websites and apps, with privacy-friendly CAPTCHA alternatives designed for GDPR compliance.
2,203
MIT
Alternative to: hCaptcha
Procaptcha
A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications.
294
Apache-2.0
Alternative to: hCaptcha
Private Captcha
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
167
Unknown
Alternative to: hCaptcha
Friendly Captcha
Privacy-compliant CAPTCHA alternative using proof-of-work technology. Protects websites from bots and spam without user interaction or data tracking.
24
MPL-2.0
Alternative to: hCaptcha