Cap is a fast, lightweight, and modern open-source CAPTCHA alternative based on SHA-256 proof-of-work (PoW). It’s 250x smaller than hCaptcha, privacy-focused, fully customizable, and easy to self-host. Cap helps prevent spam and abuse without tracking users, making it ideal for privacy-conscious developers. Built for speed and simplicity, Cap is perfect for modern web apps, forms, and APIs that need secure, lightweight human verification.
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