* [FCaptcha v1.6.0](https://github.com/WebDecoy/FCaptcha) – Detect bots, vision-based AI agents, headless browsers and automation using 40+ behavioral signals plus server-verified SHA-256 proof-of-work.

* [Scrapfly Anti-bot Detector v2.6](https://github.com/scrapfly/Antibot-Detector) – Manifest V3 Chrome extension detecting CAPTCHAs, anti-bot systems, and browser fingerprinting in real time with confidence scores and capture tools.