Software
We've compiled a list of 11 free and paid alternatives to Negative Captcha. The primary competitors include reCAPTCHA, Confident Captcha. In addition to these, users also draw comparisons between Negative Captcha and Mollom, Solve Media's CAPTCHA TYPE-IN™, phpformmailer. Also you can look at other similar options here: About.
We've compiled a list of 11 free and paid alternatives to Negative Captcha. The primary competitors include reCAPTCHA, Confident Captcha. In addition to these, users also draw comparisons between Negative Captcha and Mollom, Solve Media's CAPTCHA TYPE-IN™, phpformmailer. Also you can look at other similar options here: About.
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio...
Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture...
Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your...
Solve Media's CAPTCHA TYPE-IN ads are an easy plug-in solution that saves your users time while...
Open-source implementation of server-side spam filtering of blog comments and forum posts.
Securimage is a script for generating complex images and CAPTCHA codes to protect forms from spam...
FeedCaptcha is a new captcha system, easy to integrate and with meaning for your product.
UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect...
A plugin to make the process of creating a negative captcha in Rails much less painful
A plugin to make the process of creating a negative captcha in Rails much less painful
A negative captcha has the exact same purpose as your run-of-the-mill image captcha: To keep bots from submitting forms. Image ("positive") captchas do this by implementing a step which only humans can do, but bots cannot: read jumbled characters from an image. But this is bad. It creates usability problems, it hurts conversion rates, and it confuses the shit out of lots of people. Why not do it the other way around? Negative captchas create a form that has tasks that only bots can perform, but humans cannot. This has the exact same effect, with (anecdotally) a much lower false positive identification rate when compared with positive captchas. All of this comes without making humans go through any extra trouble to submit the form. It really is win-win.
Captcha Recognition
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