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I am looking for an open source, or privacy conscious alternative to reCaptcha. Or any other bot protection for web forms.

Preferably in PHP or JavaScript.

At a minimum, free and not Google.

  • If you omit the open-source requirement, hCaptcha is a great alternative to Google's reCAPTCHA. They do collect some information, though. – David Refoua Feb 24 at 3:53
  • @DavidRefoua be aware that they are currently advertising/astroturfing/spamming their services all around. I saw some posts on the SE network too (now removed). – chrki Aug 1 at 15:48
  • @chrki Well that's obviously not nice, but at the time I suggested their services, I was impressed to see a non-Google alternative that actually was worth using. No idea if their services are still useful, though. – David Refoua Aug 1 at 16:30
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Securimage, or http://www.phpcaptcha.org is a great alternative that I recently found. Although I have not experienced its effectiveness. It is entirely self hosted open source, and runs in php and javascript. It is very user friendly and heavily customizable in appearance and function.

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