CleanTalk is a cloud-based anti-spam service that protects websites without affecting user experience. It supports WordPress, Joomla, and Drupal and offers real-time email validation and spam comment and registration prevention. CleanTalk offers a SpamFireWall to block unwanted traffic and minimize server strain, improving site speed. Setup takes minutes. This service is praised for using innovative algorithms to keep user interactions clean without CAPTCHAs or other obtrusive verification methods.