Tiago
78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
---
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# https://vitepress.dev/reference/default-theme-home-page
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layout: home
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hero:
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name: "Cap"
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text: "A modern, lightning-quick PoW captcha"
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tagline: "Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work"
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image:
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src: /logo.png
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alt: VitePress
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actions:
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- theme: brand
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text: Quickstart & docs
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link: /guide
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- theme: alt
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text: Demo
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link: https://cap-starter.glitch.me/
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- theme: alt
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text: GitHub
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link: https://github.com/tiagorangel1/cap
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features:
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- icon: ⚡️
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title: 250x smaller than hCaptcha
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details: Cap's widget library is extremely small, only 12kb minified and brotli'd.
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- icon: 🔒️
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title: Private
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details: Cap's usage of proof-of-work eliminates the need for any tracking, fingerprinting or data collection.
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- icon: 🌈
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title: Fully customizable
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details: Cap is self-hostable so you can customize both the backend & frontend — or you can just use CSS variables
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- icon: 🤖
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title: PoW-based
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details: Cap uses proof-of-work instead of complex puzzles, making it easier for humans and harder for bots
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- icon: 🧩
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title: Standalone mode
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details: Cap offers a standalone mode with Docker, allowing you to use it with languages other than JS.
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- icon: 💨
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title: Invisible mode
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details: Cap can run invisibly in the background using a simple JS API.
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- icon: ☁️
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title: Floating mode
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details: Floating mode keeps your CAPTCHA hidden until it's needed
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- icon: 🌳
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title: Fully FOSS
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details: Completely open source under the Apache license 2.0 license
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---
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## What is Cap?
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Cap is a lightweight, open-source CAPTCHA alternative that uses SHA-256-based proof-of-work to verify real users and block bots — no cookies, no trackers.
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- ✅ Privacy-friendly
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- ⚡ Fast and lightweight
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- 🔓 Fully open source (Apache 2.0)
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- 🧩 Pluggable widget + solver + backend
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It's ideal for:
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- Protecting APIs from bots
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- Preventing spam on forms
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- Blocking automated login attempts
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- Securing free-tier abuse
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Cap is built with JavaScript, runs on any JS runtime (Bun, Node.js, Deno), and has no dependencies. If you're not using any JS runtime, you can also use the standalone mode with Docker, which relies entirely on a simple REST API to create and validate challenges.
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Zero dependencies, developer-friendly, and effective against spam, DDoS, and automation.
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## Alternatives
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Cap.js is a modern alternative to:
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- [reCAPTCHA](https://www.google.com/recaptcha/about/)
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- [hCaptcha](https://www.hcaptcha.com/)
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- [Cloudflare Turnstile](https://developers.cloudflare.com/turnstile/)
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But unlike them, Cap is **computation-bound, not tracking-bound**. |