Anti-Spam by CleanTalk is a cloud spam protection. Spam protection works invisible for visitors and they do not need to prove that they are not bots.
Cloud capabilities allow you to view all processed requests in the anti-spam log and control the operation of the service.
Additional features of personal lists expand your options for protecting the site.
At the moment, protection is implemented only for spam protection for the Contact Form plugin. https://plugins.craftcms.com/contact-form