In addition to Honeypot and Captcha, this is an interesting safeguard to prevent forms from being filled in by spam robots.

It works with Javacript and it checks whether the mouse is moved and / or swiped (mobile). Robots do not do this. The browser must allow Javascript (usually of course), otherwise you will get a notification.

It seems to be better than Honeypot and easier than Captcha, of course, because the user does not notice it.

At the settings you get an overview of the forms. You can also add or remove them yourself.