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CapJS is a privacy-first, proof-of-work CAPTCHA alternative designed to protect your applications from bots, spam, and abuse without relying on tracking, fingerprinting, or invasive challenges. Unlike traditional CAPTCHA providers, CapJS is completely free and open-source, with no usage limits or paid tiers. Even better, when using Atomd, you do not need to generate or manage any keys — everything is securely self-hosted and handled for you. While CapJS is an excellent choice for full control, privacy, and cost efficiency, you may still consider Cloudflare Turnstile if you prefer a fully managed, plug-and-play solution with global infrastructure.

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In Atomd

To enable CapJS, navigate to your Atomd dashboard and toggle CapJS on.