Open Source CAPTCHA & Bots

The CAPTCHA & Bots we recommend, filtered to Open Source. See all CAPTCHA & Bots →

Self-hosted CAPTCHA that proves a visitor is human with a background proof-of-work puzzle. No cookies, no tracking, MIT licensed.

Self-hosted, proof-of-work CAPTCHA written in Rust. Rate-limits abusive traffic without tracking or profiling your visitors.