WordPress.org

Author: Rémy Roy

yaCAPTCHA is a CAPTCHA plugin for WordPress that helps you block comment spam from automated bots. In order to post comments, users will have to write down the characters that are part of an image. Since it is relatively hard for automated programs to figure out those characters, this will help prevent comment spam from those programs.

Requirements

• WordPress 1.5 or above.
• PHP 4.0.6 or above with GD2 library support.
• Theme must support the 'comment_form' action.

Strengths vs other solutions

• Easy to install
• Does not require Javascript to work
• Broad Wordpress version support