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.







This is great. I will use it on my next project as it seems really straightforward and easy to implement. Congrats for the launch & good luck!
Cap
@aeromaniax thanks!
Pontoon
Congrats on the launch, looks great!
kool
I like the lightweight and privacy-focused approach! 😄
Migma AI
We'll use this, looks so good and modern. Can we customize the style?
Cap
@migma yep! everything is customizable through css variables
Blastable
👏👏