Captcha Open Source Projects

Discover 1 open source Captcha repository from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Captcha projects here are most often combined with Privacy, Security and Self Hosted. Last updated November 8, 2026.

altcha: Self-Hosted CAPTCHA Alternative with Proof of Work

ALTCHA is a TypeScript web component for self-hosted, privacy-first protection against spam and abuse, using proof of work instead of visual puzzles. It avoids tracking and fingerprinting, with accessibility features and server integrations for multiple languages.

ActiveHealth 44/100

TypeScriptSecurityPrivacy

Added Nov 8, 2026 View details

altcha: Self-Hosted CAPTCHA Alternative with Proof of Work

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