Cap
A free, open-source CAPTCHA solution that replaces reCAPTCHA with proof-of-work and instrumentation challenges while prioritizing user privacy and data ownership.
Cap is an open-source alternative to:
Cap is a privacy-first, self-hosted alternative to reCAPTCHA designed to protect your websites and applications from spam and abuse without compromising user data.
Key Features
- Privacy-First: No tracking, no data collection, and no reliance on third-party services.
- Proof-of-Work: Uses computational challenges to verify human interaction.
- Instrumentation Challenges: Lightweight, non-intrusive verification methods.
- Self-Hosted: Full control over your data and infrastructure.
- Open Source: Free to use, modify, and distribute under open-source licenses.
- Easy Integration: Compatible with most web frameworks and platforms.
- Customizable: Tailor verification methods to fit your specific needs.
- No AI Dependency: Does not require or rely on AI models or LLMs.
Tech / Self-Hosting
Cap is built with modern web technologies and can be deployed on any server or cloud platform. The project provides detailed documentation for self-hosting, including Docker support and step-by-step guides for various deployment scenarios. It supports stateless and stateful deployments with options for Redis, Cloudflare KV, and PostgreSQL for replay prevention and instrumentation data storage.