Aimy Capture-Less Form Guard is a user friendly way to protect your forms from spam bots and therefore improves the security of your Joomla! website. The system plugin is a Captcha alternative that does not require user action: It uses some well known and GDPR-friendly anti-spam tests to decide whether the user is a human or a machine on form submission.
This captcha plugin for Joomla! 3 and 4 implements the Joomla! captcha interface. Therefore all extensions that can use Joomla! captcha plugins can be protected.
INFO: https://www.aimy-extensions.com/joomla/captcha-less-form-guard.html