Open Source Alternatives to hCaptcha

A bot mitigation platform that delivers CAPTCHA challenges, AI-driven bot detection, fraud protection, and account defense while preserving user privacy across web and mobile applications.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to hCaptcha give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 3 open source alternatives to hCaptcha. The most popular are Cap, ALTCHA and mCaptcha. Most use the AGPL-3.0 or Apache-2.0 license, and 3 offer an official Docker image.