F***Captcha: An open source CAPTCHA designed for detecting vision AI agents (Claude Computer Use, OpenAI Operator)

Instead of playing the "spot the crosswalk" game that vision models have already won, it focuses on:

• Behavioral signals (how you interact, not what you click)
• Proof-of-work challenges that don't scale for automated traffic
• Staying out of the way for actual humans

GitHub: https://github.com/WebDecoy/FCaptcha

Demo: https://webdecoy.com/product/fcaptcha-demo/