mCaptcha
mCaptcha is a proof-of-work based captcha system that prioritizes user privacy and offers a fully automated experience. Unlike traditional captcha systems, mCaptcha does not track or profile users, ensuring a privacy-focused user experience. It is designed to be robust and accurate, not relying on IP addresses for rate-limiting, making it suitable for users behind NATs. The user experience is silent and seamless, eliminating the need for annoying image-based captchas. mCaptcha uses a proof-of-work solution to fiercely defend your site, making it more expensive for attackers to target your site than for you to respond to their requests. It is a libre software, with client libraries licensed under proprietary-friendly free software licenses. mCaptcha is also compatible with reCAPTCHA and hCaptcha, making it a convenient drop-in replacement. The core functionality of mCaptcha is to use a SHA256 based proof-of-work system to rate limit users, providing a token upon successful validation that users can then submit with their request or form submission to the target website.
Quick Info
| Field | Value |
|---|---|
| Category | Security |
| Subcategory | Firewall & Security |
| Default Port | 80 |
| Docker Image | mcaptcha/mcaptcha:v0.1.0 |
| Dependencies | Docker, Postgres |
| OS Support | Ubuntu 22.04, Ubuntu 24.04, Debian 12 |
Links
- 🌐 Website
- 📚 Documentation
- 💻 GitHub