Free Image-Based Captcha: VidoopCAPTCHA
VidoopCAPTCHA is a free verification solution that works image-based which is unusual compared to the widely-used text-based ones. It aims to be a more user-friendly solution as text-based captchas can sometimes be so hard to read for humans besides bots. VidoopCaptcha is a hosted service & have plugins for WordPress, Ruby on Rails, and Drupal. Also, there are libraries for programming languages such as PHP, Python, and .NET. It offers some customization options like ca
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