Software
We've compiled a list of 13 free and paid alternatives to reCAPTCHA. The primary competitors include Captcheck, Confident Captcha. In addition to these, users also draw comparisons between reCAPTCHA 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 13 free and paid alternatives to reCAPTCHA. The primary competitors include Captcheck, Confident Captcha. In addition to these, users also draw comparisons between reCAPTCHA and Mollom, Solve Media's CAPTCHA TYPE-IN™, phpformmailer. Also you can look at other similar options here: About.
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...
A plugin to make the process of creating a negative captcha in Rails much less painful
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio...
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio...
Web-Based
reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows.
About 200 million CAPTCHAs are solved by humans around the world every day. In each case, roughly ten seconds of human time are being spent. Individually, that's not a lot of time, but in aggregate these little puzzles consume more than 150,000 hours of work each day. What if we could make positive use of this human effort? reCAPTCHA does exactly that by channeling the effort spent solving CAPTCHAs online into "reading" books.
To archive human knowledge and to make information more accessible to the world, multiple projects are currently digitizing physical books that were written before the computer age. The book pages are being photographically scanned, and then transformed into text using "Optical Character Recognition" (OCR). The transformation into text is useful because scanning a book produces images, which are difficult to store on small devices, expensive to download, and cannot be searched. The problem is that OCR is not perfect.
Captcha Recognition
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