tiagozip /cap
privacy-first, open-source and self-hosted CAPTCHA alternative with PoW and instrumentation challenges.
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README
a privacy-first and self-hosted CAPTCHA.
read the docs or try the demo
what's cap?
cap is a self-hosted and privacy-first captcha alternative that doesn't force your users to click on traffic lights. there are no puzzles, no tracking, and no third parties watching your visitors.
instead, the user's browser quietly solves a few small challenges in the background, such as gpu-resistant proof-of-work and instrumentation, which can also be configured to stop autonomous AI agents from using up your resources.
it has no dependencies by default, is 200x smaller than hCaptcha, and you can run it with docker, on workers or on railway. it's already used in production by large companies like bunny.net and adguard.
license
cap is licensed under apache 2.0.Top issues
#320Build and publish Docker image through CI with provenance4 comments · 2026-09-22#356False positive: behavior_agent0 comments · 2026-11-11#355False positive: behavior_agent0 comments · 2026-11-11#354remove AVX2 requirement0 comments · 2026-11-10
Latest release
[email protected] [email protected] 2026-11-09Uses capjs-core 0.1.14. Docker: tiago2/cap:4.0.7