这是一篇迁移自 Cap: The Fast, Privacy-First CAPTCHA That Cuts Through the Clutter 的文章。
Tired of bloated CAPTCHAs that track users, slow down websites, or force you into restrictive ecosystems? Cap.js is the modern alternative—lightweight, open-source, and built on proof-of-work (PoW) to stop bots without sacrificing privacy or performance.
Cap.js redefines what a CAPTCHA can be.
Github • Website • Quickstart • Demo
Why I those Cap.js
✅ 250x Smaller, 100% Faster
The core widget clocks in at 12KB, making it 250x smaller than hCaptcha. No intrusive puzzles—just a quick computational challenge that’s easy for humans but exhausting for bots.
🔒 Privacy by Design
Zero tracking, fingerprinting, or data collection. Unlike competitors, Cap.js relies on math, not surveillance, to verify users.
🔧 Unmatched Flexibility
Deploy with any language/framework via a simple REST API. Customize the backend and frontend to fit your stack.
Feature comparison
Alternatives
Cap is a modern alternative to:
FAQs
What is Cap and what does it offer?
Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work. It’s fast, private, and extremely simple to integrate.
Is Cap completely free?
Yes, Cap.js is completely free. Cap is an open source project that you can deploy on your own server (as a standalone server) or integrate into your backend application.
How difficult is it to integrate Cap.js?
Integrating Cap is very simple! All you need to do is import a JavaScript file into your client and set up the widget component to get started! For more information, please refer to the Quickstart.
Conclusion
Cap.js isn’t just another tool—it’s a shift toward privacy-first, developer-friendly security.
Based on my experience over the past few days, Cap.js is very easy to integrate. It can be tested and deployed with many of my projects and frameworks in just ten minutes.
I have recommended Cap.js to my friends and also shared it with friends on the Fediverse (like you!) through articles/posts.