tiago
93 lines
3.9 KiB
Markdown
93 lines
3.9 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: "The modern, open-source CAPTCHA"
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tagline: "Lightweight, self-hosted, privacy-friendly, and designed to put you first. Switch from reCAPTCHA in minutes."
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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: Get started →
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link: /guide
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- theme: alt
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text: Demo
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link: /guide/demo.md
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- theme: alt
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text: View on GitHub
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link: https://github.com/tiagozip/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: ~20kb, zero dependencies, loads in milliseconds
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- icon: 🔒️
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title: Privacy-first
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details: Cap doesn't send any telemetry back to our servers
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- icon: 🌈
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title: Fully customizable
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details: Change the colors, size, position, icons and more with CSS variables
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- icon: 💽
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title: Proof-of-work
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details: Your users no longer have to waste time solving visual puzzles.
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- icon: 🐳
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title: Standalone mode
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details: Run Cap anywhere with a Docker container with analytics & more
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- icon: 💨
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title: Invisible
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details: Hide Cap's widget and solve challenges in the background
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- icon: 🤖
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title: M2M
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details: Keep your APIs protected while accessible to friendly robots
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- icon: 🌳
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title: Open-source
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details: Completely free & open-source under the Apache 2.0 license
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---
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## What is Cap?
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Cap is the modern, open-source alternative to traditional CAPTCHAs that uses proof-of-work instead of annoying visual puzzles.
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It's built with JavaScript and Rust and has no dependencies. You can either run it on any JavaScript runtime (Bun, Node.js, Deno), or use the standalone mode with Docker.
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Cap is built into 2 main parts. The [widget](https://capjs.js.org/guide/widget.html) is a small client-side JavaScript library using custom components and WASM that renders the CAPTCHA and solves the challenge.
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The [Standalone Server](https://capjs.js.org/guide/standalone.html) is a Docker image that helps you use Cap with any language or framework. As an alternative, if your server-side uses JavaScript, you can use the lighter [server](https://capjs.js.org/guide/server.html) library.
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Cap also has a [M2M library](https://capjs.js.org/guide/solver.html) that implements a custom proof-of-work solver for protecting API endpoints that you still want public.
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## Why Cap?
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- **250x smaller than hCaptcha**
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~20kb, zero dependencies, loads in milliseconds
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- **Privacy-first**
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Cap doesn't send any telemetry back to our servers
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- **Fully customizable**
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Change the colors, size, position, icons and more with CSS variables
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- **Proof-of-work**
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Your users no longer have to waste time solving visual puzzles.
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- **Standalone mode**
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Run Cap anywhere with a Docker container with analytics & more
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- **Invisible**
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Hide Cap's widget and solve challenges in the background
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- **M2M**
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Keep your APIs protected while accessible to friendly robots
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- **Open-source**
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Completely free & open-source under the Apache 2.0 license
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It's ideal for protecting APIs from bots, preventing spam on forms, blocking automated signup attempts and securing free-tier abuse.
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Cap is a great alternative to [reCAPTCHA](https://www.google.com/recaptcha/about/), [hCaptcha](https://www.hcaptcha.com/) and [Cloudflare Turnstile](https://developers.cloudflare.com/turnstile/). Check out the [feature comparison](https://capjs.js.org/guide/alternatives.html) to see how Cap compares to other CAPTCHAs.
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## License
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Apache 2.0
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Copyright (c) 2025–present tiago
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---
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[](https://www.bestpractices.dev/projects/9920) [](https://www.producthunt.com/posts/cap-5?embed=true&utm_source=badge-top-post-topic-badge&utm_medium=badge&utm_souce=badge-cap-5) |