Preventing Spam Comments in Wordpress Before They Happen

Rather than using an after-the-fact solution like Akismet to stop comment spam, I prefer to use a Captcha or other human verification technique to stop all spam from ever being saved to my Wordpress database.  Some Captchas are difficult to read, so I prefer something that is either a math addition problem or an interactive one that only requires one click or drag.  Some interactive Captcha plugins may not work on mobile devices.


Here are few of the top rated options to block Wordpress comment spam at the form level.


Math Captcha
Customizable math Captcha prevents comment spam, bot registration, and integrates with Contact Form 7.
4.5 out of 5 stars
Last Updated: 2014-9-5
Compatible up to: 4.0

Sweet Captcha 
Uses an interactive, fun, and illustrated widget to prevent comment and registration spam.
4.2 out of 5 stars
Last Updated: 2014-9-3

Captcha
Uses a math equation Captcha to stop comment spam, also integrates with Contact Form 7 and BuddyPress registration forms.
4.6 out of 5 stars
Last Updated: 2014-10-15