CapA modern, lightning-quick PoW captcha

Cap is the modern open-source ReCAPTCHA alternative designed for speed. FOSS, lightweight, private and secure.

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250x smaller than hCaptcha

Cap is lightning fast, so your pages load instantly and users don't wait around

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No more tracking or data collection. Cap is GDPR compliant and keeps your users' data private

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

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Cap uses PoW instead of frustrating image puzzles, making it easier for humans and harder for bots

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Need silent protection? Cap can run invisibly in the background without any user interface

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The floating mode keeps your CAPTCHA hidden until it's needed, creating a smoother experience

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Completely open source under AGPL-3.0. No hidden costs, no premium features, no surprises and completely FOSS

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Cap's web component & server-side library are super easy to integrate into your website