Cap-Worker - Showcase Project

CAP CAPTCHA is a next-generation, open-source CAPTCHA service built on Cloudflare Workers, designed to replace outdated puzzle-based CAPTCHAs with a lightweight SHA-256 Proof-of-Work (PoW) challenge. By leveraging Cloudflare’s global edge network, CAP delivers sub-100ms response times, automatic scaling, and seamless integration for developers—without compromising privacy. Unlike traditional CAPTCHAs that frustrate users and collect data, CAP CAPTCHA is privacy-first, collecting no personal information and requiring minimal setup. Its distributed architecture powered by Durable Objects ensures strong consistency, conflict-free state management, and massive concurrency across 250+ edge locations. With a RESTful API, SDK support, and a quick 5-minute integration flow, CAP CAPTCHA makes it easy for developers to add bot protection that is both developer-friendly and user-respectful. 🔑 Key Highlights ⚡ Ultra-low latency: <100ms responses via Cloudflare Edge 🔒 Proof-of-Work: Cryptographically secure SHA-256 challenge-response 🌍 Global reach: Deployed across 250+ cities worldwide 👨‍💻 Developer-first: Simple APIs, SDKs, and easy validation pipeline 🛡 Privacy-focused: No tracking, no data collection 🚀 Auto-scaling: Cloudflare Workers + Durable Objects for massive concurrency Live Demo → captcha.gurl.eu.org