Free PlayThru Alternatives
PlayThru is described as 'The PlayThru is the next generation of online human verification. It is designed to be more simple, more intuitive, and more fun than the current CAPTCHA options'. There are six alternatives to PlayThru for various platforms. The best alternative is reCAPTCHA, which is free. Other great sites and apps similar to PlayThru are visualCaptcha (Free, Open Source), UniqPin (Free Personal), Confident Captcha (Freemium) and Negative Captcha (Free, Open Source).
- reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. View 14 alternatives to reCAPTCHA
- A configurable captcha solution, focusing on accessibility & simplicity whilst maintaining security. View 12 alternatives to visualCaptcha
Discontinued
As from Dec 26, 2016: Please note visualCaptcha is no longer actively developed. It still works and should continue to, but it won't be improved by the initial team anymore. ...
Source: https://github.com/emotionLoop/visualCaptcha/blob/master/README.md- Free • Open Source
- Self-Hosted
- UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect a human or a computer operate with it. View 11 alternatives to UniqPin
- Confident Technologies provides free CAPTCHA security software called Confident CAPTCHA, a picture CAPTCHA that stops spam and bots. View 13 alternatives to Confident Captcha
- A plugin to make the process of creating a negative captcha in Rails much less painful. View 11 alternatives to Negative Captcha