Almost never included 1 times. You always have to re-enter. In the form of comments write 4-3 = 1 - says that it is wrong.
Most of the important features are pro. Not worth $19 for sticking Captcha on Contact Form 7.
So, very easy to install and setup and put into your forms BUT setting up on a custom form is not working, details & examples to do so are limited, support is apparently not available. Tried their forums, tried email, trying here, nothing. So, the captcha is in the custom form, but does not work and verify.. so kind of pointless.
Nice plugin, but still forcing an error message on my mobile Jetpack theme since months:
Warning: Missing argument 1 for cptch_custom_form(), called in /homepages/19/asdf/htdocs/wp-content/plugins/captcha/captcha.php on line 464 and defined in/homepages/19/asdf/htdocs/wp-content/plugins/captcha/captcha.php on line802
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