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headless-browser-detection

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WebDecoy / FCaptcha

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Open-source, invisible CAPTCHA that detects AI agents, bots, and headless browsers via 40+ behavioral signals, device & TLS fingerprinting, and SHA-256 proof of work. Self-hosted and privacy-first.

nodejs python go security captcha self-hosted web-security fingerprinting anti-bot bot-detection proof-of-work invisible-captcha behavioral-analysis selenium-detector scraping-protection tls-fingerprinting headless-browser-detection ai-bot-detection puppeteer-detection playwright-detection
  • Updated Jun 11, 2026
  • JavaScript

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