Interactive Demo

F***Captcha Demo

Try both checkbox and invisible modes. See real-time behavioral analysis and bot detection scores.

Checkbox Mode

Interactive

Click the checkbox to verify. FCaptcha analyzes your mouse movements, click behavior, and environmental signals in real-time.

Zero-Click

Fill out the form below. FCaptcha runs silently in the background, scoring your behavior without any visible widget.

Vision AI Agents

GPT-4V, Claude, and other screenshot-based automation

Headless Browsers

Puppeteer, Playwright, Selenium, PhantomJS

Automation Tools

WebDriver, Cypress, Nightmare, custom bots

CAPTCHA Farms

Unusual timing from human solving services

Behavioral Anomalies

Scripted movements, inhuman timing patterns

Fingerprint Abuse

Same fingerprint from many IPs or vice versa

Keystroke Cadence

7 biometric metrics detect bots with timing jitter

Playwright Detection

Detects Playwright globals and reconfigured WebDriver

Get started with our open-source library or use the managed WebDecoy service.