Metal Captcha Alternatives

Captchas don't have to be boring

Open Source

reCAPTCHA is a free security service that protects your websites from spam and abuse.

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The worst captcha ever! Forces you to do 10 squats

Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.

CAPTCHA that filters out humans and only lets programs pass

GeeTest protects your websites, mobile Apps and APIs from bot threats.

freemium

Replace fire hydrants and traffic lights with your brand.

Create parodies of the iconic O'Reilly book covers

Online Courses - Learn Anything, On Your Schedule

Browse through over 150 billion web pages archived from 1996 to a few months ago.

Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture...

Best Courses. Top Institutions. Learn anytime, anywhere.

The TeXworks project is an effort to build a simple TeX front-end program (working environment)...