The user-friendly CAPTCHA alternative
Friendly Captcha is different
The problem with other CAPTCHAs
Cryptography made simple
The new solution to prevent spam and abuse.
Friendly Captcha is a proof-of-work based solution in which the user’s device does all the work.
Friendly Captcha generates a unique crypto puzzle for each visitor. As soon as the user starts filling a form it starts getting solved automatically. Solving it will usually take a few seconds. By the time the user is ready to submit, the puzzle is probably already solved.