Cap
A lightweight, modern open-source captcha
In plain words
Cap is an open-source CAPTCHA alternative that uses SHA-256 proof-of-work verification instead of traditional image recognition. Significantly smaller than competing solutions, it prioritizes privacy and customization while remaining fully invisible to users. Built with JavaScript instrumentation and available as free and open-source software, Cap is designed for developers seeking a lightweight, privacy-focused security option for their applications.
written from the facts on this page · September 2026
From the sources
Cap is a lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work and JS instrumentation. It's: - ⚡️ 250x smaller than hCaptcha - 🔒️ Private - 🌈 Fully customizable - 🤖 PoW-based - 🌳 Fully FOSS - 💨 Invisible
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