https://github.com/tiagorangel1/cap

A modern, lightning-quick PoW captcha
https://github.com/tiagorangel1/cap

bun captcha javascript proof-of-work

Last synced: 6 months ago
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A modern, lightning-quick PoW captcha

• Host: GitHub
• URL: https://github.com/tiagorangel1/cap
• Owner: tiagorangel1
• License: other
• Created: 2025-01-11T17:35:52.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2025-04-09T17:01:44.000Z (6 months ago)
• Last Synced: 2025-04-09T18:21:46.721Z (6 months ago)
• Topics: bun, captcha, javascript, proof-of-work
• Language: JavaScript
• Homepage: https://cap.tiagorangel.com/
• Size: 1.52 MB
• Stars: 14
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

          


# cap — modern, lightning-quick PoW captcha

Cap is a lightweight, modern open-source CAPTCHA alternative designed using SHA-256 PoW.

| [Learn more](https://capjs.js.org)

|----------|

[![npm @cap.js/server](https://img.shields.io/badge/@cap.js/-server-CB0200?logo=npm)](https://www.npmjs.com/package/@cap.js/server) [![npm @cap.js/widget](https://img.shields.io/badge/@cap.js/-widget-CB0200?logo=npm)](https://www.npmjs.com/package/@cap.js/widget) [![OpenSSF Best Practices](https://www.bestpractices.dev/projects/9920/badge)](https://www.bestpractices.dev/projects/9920)



## Why Cap?

- ⚡️ **250x smaller than hCaptcha**  

  Cap's widget library is extremely small, only 12kb minified and brotli'd.

- 🔒️ **Private**  

   Cap's usage of proof-of-work eliminates the need for any tracking, fingerprinting or data collection.

- 🌈 **Fully customizable**  

   Cap is self-hostable so you can customize both the backend & frontend — or you can just use CSS variables

- 🤖 **PoW-based**  

   Cap uses proof-of-work instead of complex puzzles, making it easier for humans and harder for bots

- 🧩 **Standalone mode**  

   Cap offers a standalone mode with Docker, allowing you to use it with languages other than JS.

- 💨 **Invisible mode**  

   Cap can run invisibly in the background using a simple JS API.

- ☁️ **Floating mode**  

   Floating mode keeps your CAPTCHA hidden until it's needed

- 🌳 **Fully FOSS**  

   Completely open source under AGPL-3.0, with no premium versions.

## Star History

[![Star History Chart](https://api.star-history.com/svg?repos=tiagorangel1/cap&type=Date)](https://www.star-history.com/#tiagorangel1/cap&Date)