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Cap: Lightweight, modern open-source CAPTCHA alternative using proof-of-work

Cap.js is a fast, privacy-friendly proof-of-work CAPTCHA alternative to reCAPTCHA and hCaptcha. Zero dependencies, developer-friendly, and effective against spam, DDoS, and automation.

It runs a simple REST API that can be used to create and validate challenges and an interactive UI to manage your keys. If you're not using any JS runtime, you can also use the standalone mode with Docker, which relies entirely on a simple REST API to create and validate challenges. Protecting APIs from bots Preventing spam on forms Blocking automated login attempts Securing free-tier abuse

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