tiago
62 lines
2.9 KiB
Markdown
62 lines
2.9 KiB
Markdown
# <img src="https://github.com/tiagozip/cap/blob/main/docs/public/logo-small.webp?raw=true" alt="" align="left" width="40" height="40"> Cap
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Cap is a lightweight, modern open-source CAPTCHA alternative using <a href="https://capjs.js.org/guide/effectiveness.html">SHA-256 proof-of-work</a>. It's fast, private, and extremely simple to integrate.
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<a href="https://capjs.js.org/guide/demo.html"><img src="./assets/captcha.svg" alt="Cap widget" width="250"></a>
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## Documentation
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**[Read the docs](https://capjs.js.org)**, try the [demo](https://capjs.js.org/guide/demo.html) or read the [feature comparison](https://capjs.js.org/guide/alternatives.html)
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## What is Cap?
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Cap replaces visual captchas with modern, accessible and privacy-preserving <a href="https://capjs.js.org/guide/effectiveness.html">proof-of-work challenges</a>. No images, no tracking, no dependencies, works everywhere.
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You can either run it on any JavaScript runtime, or use the standalone mode with Docker. [Learn more about how Cap works](https://capjs.js.org/guide/)
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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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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/)
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## License
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This project is licensed under the Apache-2.0 License, please see the [LICENSE](https://github.com/tiagozip/cap/blob/main/LICENSE) file for details.
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Copyright ©2025 - present [tiago](https://tiago.zip)
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---
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<a href="https://www.digitalocean.com/">
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<img src="https://opensource.nyc3.cdn.digitaloceanspaces.com/attribution/assets/SVG/DO_Logo_icon_blue.svg" width="30px">
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</a>
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Cap's free instance is supported by DigitalOcean for open-source. <a href="https://www.digitalocean.com/?refcode=7e41cf645be3&utm_campaign=Referral_Invite&utm_medium=Referral_Program&utm_source=badge">Try DigitalOcean</a> and get $250 worth of credits.
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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)
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