WPForms custom captcha addon allows you to add custom questions captcha or math questions captcha to your WordPress forms.
Captcha helps you protect your forms against spam submission.
While WPForms comes with Google reCAPTCHA, some users prefer to use their own custom questions as CAPTCHA.
You can also use the custom captcha addon to add random math questions as CAPTCHA.
You need to have WP Forms Plugins in order for this add-on to work. You can download it here