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OpenAlternative

Open Source hCaptcha Alternatives

A curated collection of the 6 best open source alternatives to hCaptcha.

The best open source alternative to hCaptcha is Cap. If that does not suit you, we have compiled a ranked list of other open source hCaptcha alternatives to help you find a suitable replacement.

hCaptcha alternatives are mainly CAPTCHA & Bot Protection. Browse these if you want a narrower list of alternatives or are looking for a specific functionality of hCaptcha.

Written by OpenAlternative Last updated: June 2, 2026
#1

Cap

Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero te

Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x...

#2

ALTCHA

ALTCHA offers cutting-edge spam and abuse protection for websites and apps, with privacy-friendly CAPTCHA alternatives designed for GDPR compliance.

ALTCHA offers cutting-edge spam and abuse protection for websites and apps...

#3

mCaptcha

Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement fo

Privacy-focused proof-of-work CAPTCHA system that silently protects websit...

#4

Procaptcha

A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications.

A blockchain-based CAPTCHA solution offering improved security, user exper...

#5

Private Captcha

Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic prot

Privacy-first CAPTCHA service that blocks bots while keeping forms accessi...

#6

Friendly Captcha

Privacy-compliant CAPTCHA alternative using proof-of-work technology. Protects websites from bots and spam without user interaction or data tracking.

Privacy-compliant CAPTCHA alternative using proof-of-work technology. Prot...