reCAPTCHA Alternatives
reCAPTCHA
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.
Best Free reCAPTCHA Alternatives
Are you trying to find the best programs like reCAPTCHA? Have a look at this post and weigh in on your thoughts. Cool!
visualCaptcha
FreeOpen SourceSelf-HostedA configurable captcha solution, focusing on accessibility & simplicity whilst maintaining security.
Features:
- Accessibility
- Captcha Recognition
- Mobile friendly
- Php
- Ruby
Sblam!
FreeOpen SourceLinuxWebOpen-source implementation of server-side spam filtering of blog comments and forum posts. It's available as a free web service. It's open source, so you can...
Features:
- Php
- WordPress
reCAPTCHA Reviews
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