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.
I was very pessimistic about this product—at some point, I thought it wouldn’t help at all. Now I’m happy. It just stopped the spam (registration attempts and contact form submissions) Good job!
Cap
thank you!