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The original was posted on /r/opensource by /u/Moist_Brick2073 on 2025-04-12 08:05:21+00:00.
hi everyone!
i’ve been working on Cap, an open-source proof-of-work CAPTCHA alternative, for quite a while — and i think it’s finally at a point where i think it’s ready.
Cap is tiny. the entire widget is just 12kb (minified and brotli’d), making it about 250x smaller than hCaptcha. it’s also completely private: no tracking, no fingerprinting, no data collection.
you can self-host it and tweak pretty much everything — the backend, the frontend, or just use CSS variables if you want something quick. it plays nicely in all kinds of environments too: use it invisibly in the background, have it float until needed, or run it standalone via Docker if you’re not using JS.
everything is open source, licensed under AGPL-3.0, with no enterprise tiers or premium gates. just a clean, fast, and privacy-friendly CAPTCHA.
give it a try and let me know what you think :)