vsmutok/fuckcaptchaOpen field guide to 39 CAPTCHA types: identification signals, free and open-source bypass methods, and paid alternatives. Includes a searchable web version.
FuckCaptcha is an open reference for understanding CAPTCHA types, their context and the approaches documented around them. It is intended for education and authorized research, not for evading protections on services without permission.
Browse the interactive field guide →
Bring a changing landscape of CAPTCHA systems into one approachable, maintained reference. The project aims to make the material easier to navigate, compare and cite while keeping responsible, authorized use explicit.
The project brings together a practical, maintainable reference for researchers, developers and curious readers: identify common CAPTCHA families and their context, compare documented tools and approaches with their trade-offs, and stay responsible by prioritizing authorized research, privacy and transparent sourcing.
Choose a CAPTCHA below to open its guide, review the challenge category and see the references and options documented for it.
