What is Cap?
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.
Tool Details
| Categories | Safety and Privacy platforms |
|---|---|
| Website | capjs.js.org |
| Became Popular | April 21, 2025 |
| Platforms | Web |
| Social | Twitter · GitHub |
Recent Reviews (1)
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!
Frequently Asked Questions about Cap
When did Cap become popular?
Cap became popular around April 21, 2025.
What is Cap's overall user rating?
Cap has an overall rating of 5.0/5 based on 1 user reviews.
What type of tool is Cap?
Cap belongs to the following categories: Safety and Privacy platforms.
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