- 7 alternatives
- reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows.
- Solve Media's CAPTCHA TYPE-IN ads are an easy plug-in solution that saves your users time while making your site more secure and more profitable. Instead of struggling with difficult puzzles, users enter a simple brand message or security phrase.
- Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your Drupal, Wordpress and Joomla site or blog.
"The Mollom content moderation service is no longer available … as of 2 April 2018."No screenshots yet
- UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect a human or a computer operate with it.
- Free Personal
- Open-source implementation of server-side spam filtering of blog comments and forum posts.No screenshots yet
- Free • Open Source
- Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture CAPTCHA that stops spam and bots.
- Easy to use - Nothing stupid your visitors have to type before the form submits.No screenshots yet