Narrow your search
Prevent bot and spam attacks with our superior CAPTCHA solution.
Prevents bot and spam attacks on your Web site.
Borrowing from the field of machine vision, Stanford University researchers have discovered how to solve over 90 percent of NuCaptcha's are-you-a-human video challenges.
Can't read your way past the humans-only gateway on that Web site? NuCaptcha has a filter that's easier for you, harder for robots.