6 Best Open Source hCaptcha Alternatives
A curated collection of the 6 best open source and self-hosted alternatives to hCaptcha in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for hCaptcha in 2026? The top open-source alternative is Cap — Record your screen or webcam, edit with backgrounds and effects, then share via link. Built on Rust and Tauri for native performance on macOS and Windows..
Other highly rated open-source hCaptcha alternatives include ALTCHA, mCaptcha and Procaptcha.
Record your screen or webcam, edit with backgrounds and effects, then share via link. Built on Rust and Tauri for native performance on macOS and Windows.
Record your screen or webcam, edit with backgrounds and effects, then share via link. Built on Rust and Tauri for native performance on macOS and Windows.
Self-hosted, privacy-friendly CAPTCHA alternative with proof-of-work mechanism
ALTCHA is a GDPR, WCAG 2.2 AA, and EAA compliant CAPTCHA alternative that protects websites from spam and abuse without compromising user privacy. Unlike traditional CAPTCHAs, ALTCHA uses a proof-of-work (PoW) mechanism to verify human interaction, ensuring accessibility and privacy compliance. - Privacy-Friendly: No tracking, cookies, or personal data collection, fully compliant with GDPR, WCAG 2.2 AA, and EAA. - Self-Hosted: Complete control over deployment and data, with no reliance on third-party services. - Proof-of-Work (PoW): Uses computational challenges to distinguish humans from bots without invasive checks. - Accessible: Designed to be inclusive, supporting users with disabilities and screen readers. - Lightweight & Fast: Minimal client-side footprint with efficient server-side verification. - Customizable: Supports theming, custom challenges, and integration with various frameworks. - Open Source: Free to use, modify, and distribute under the MIT license. ALTCHA is built with modern web standards and can be self-hosted on any server or platform. It supports: - Frontend Integration: Works with vanilla JavaScript, React, Vue, Svelte, and other frameworks. - Backend Verification: Compatible with Node.js, PHP, Python, Go, and more. - Docker Support: Easy deployment using Docker containers for scalable setups. - No External Dependencies: Operates independently without requiring third-party APIs or services.
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
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 experience, and resistance to bot attacks for web applications.
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
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. Protects websites from bots and spam without user interaction or data tracking.
About hCaptcha
Privacy-focused CAPTCHA service that protects websites from bots and spam while respecting user data and offering machine learning training rewards.