captcha.net

Main page screenshot of captcha.net
Competing rank
 

2.2 out of 5 by TopAlternate
Reviewed on Sep 29st, 2015

The Official CAPTCHA Site

CAPTCHA: Telling Humans and Computers Apart Automatically. Get a Free CAPTCHA For Your Site. Test Drive a CAPTCHA. New: Learn Spanish, German or French for free while translating the Web!. Applications of CAPTCHAs. Guidelines. The "Pornography Attack" is Not a Concern. Advancing Artificial Intelligence