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SI CAPTCHA Anti-Spam - Wordpress Plugin by Mike Challis

Adds CAPTCHA anti-spam methods to WordPress on the comment form, registration form, login, or all. In order to post comments or regiser, users will have to type in the phrase shown on the image. This prevents spam from automated bots. Adds security. Works great with Akismet. Also is fully WPMU and BuddyPress compatible.

You can see it in use on my blog here: Long Beach WA - Weather Blog.

Some of the many features include:

Captcha Image Support:


  1. captcha on the comment form
  2. captcha on the registration form
  3. Captcha Options tab on the Admin Plugins page



  1. Upload the 'si-captcha-for-wordpress' folder to the '/wp-content/plugins/' directory in Wordpress
  2. Activate the plugin through the `Plugins` menu in WordPress
  3. Updates are automatic. Click on "Upgrade Automatically" if prompted from the admin menu. If you ever have to manually upgrade, simply deactivate, uninstall, and repeat the installation steps with the new version.

SI CAPTCHA Anti-Spam - Wordpress Plugin: [download it] | [version change log] | [FAQ]

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If you find this site or the free PHP scripts useful to you, please consider making a small donation to help offset my time and the routine expenses of operation of this website. Thanks for your kind support! - Mike Challis

This php code provided "as is," and Long Beach Weather (Michael Challis) disclaims any and all warranties, whether express or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. Use of this code signifies your acceptance.