{"repo":"altcha-org/altcha","free":true,"listed":false,"github":"https://github.com/altcha-org/altcha","clone":"git clone https://github.com/altcha-org/altcha.git","description":"GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.","language":"TypeScript","stars":2675,"topics":["antispam","captcha","hcaptcha","recaptcha","svelte","captcha-alternative","spam-detection","spam-prevention","spam-api","ddos-protection"],"license":"MIT","category":"self-hosted-apps","readme_excerpt":"ALTCHA ALTCHA is a self-hosted, privacy-first security solution that protects your websites, APIs, and online services from spam and abuse through an innovative proof-of-work mechanism. Unlike traditional CAPTCHAs that depend on intrusive methods like cookies or fingerprinting, ALTCHA delivers robust protection while respecting user privacy. ALTCHA is fully compliant with: - Global privacy regulations : GDPR, HIPAA, CCPA, PIPEDA/CPPA, LGPD, DPDPA, and PIPL - Accessibility standards : WCAG 2.2 AA-level and the European Accessibility Act For more details, visit altcha.org. Playground Want to see it in action? Visit the official ALTCHA Playground to experiment with widget configurations, fine-tune the Proof-of-Work (PoW) settings, and see how the security mechanisms hold up in real-time. Open ALTCHA Playground Features - Frictionless Experience : Eliminates frustrating visual puzzles by using background Proof-of-Work (PoW) for a seamless user journey. - Hardware-Resistant Security : Leverages Argon2 and Scrypt memory-bound algorithms to neutralize hardware acceleration (ASICs/GPUs) and sophisticated bot farms. - Accessible Code Challenges : Provides \"Enter code from image\" fallbacks with built-in audio support for visually impaired users. - Privacy by Design : Fully GDPR compliant and cookie-free—no tracking, no fingerprinting, and no data collection. - Universal Accessibility : Engineered to exceed WCAG 2.2 AA standards, ensuring compliance with the European Accessibility Act (","default_branch":null,"files":null,"tree":[],"storefront":"/r/altcha-org","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/altcha-org/altcha/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}