mCaptcha

Silent protection that respects user privacy - mCaptcha operates invisibly in the background using proof-of-work algorithms, eliminating the need for users to solve annoying image puzzles or contribute to ML training data.

True privacy by design - Unlike traditional CAPTCHAs, mCaptcha doesn't track or profile your users. No data collection, no behavioral analysis, just pure bot protection that keeps user information completely private.

NAT-friendly rate limiting - Advanced protection that doesn't rely on IP addresses for rate limiting, ensuring users behind corporate firewalls or shared networks get the same smooth experience without false positives.

Economic defense model - Makes attacking your site more expensive than the cost of legitimate requests, creating a natural economic barrier that discourages bot traffic and abuse.

Drop-in compatibility - Seamlessly replace reCAPTCHA or hCaptcha with APIs that are fully compatible with existing implementations. No major code changes required for migration.

Open source foundation - Core system is libre software while client libraries use proprietary-friendly licenses, ensuring the technology remains accessible and transparent for security auditing.