CAPTCHAs are the most recognizable anti-bot mechanism on the web. Whether you're logging into a game, signing up for a new ...

Even with audio CAPTCHA, it can be hard for people with hearing problems. While CAPTCHA is great at stopping bots, it does add an extra step to our interactions with websites.

CAPTCHA programs that are used to determine whether a site visitor is a person or a bot come in pretty standard formats. Think text distortion (where users type the characters they see in a box ...