This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

This plugin has been closed and is no longer available for download.



ShrimpTest is an A/B testing solution for WordPress under development at Automattic. For an introduction to this project, I invite you to read Every blog has a purpose.

This version (1.0b3) is a release candidate. Bug reports appreciated.


  1. Upload to your plugins directory ( usally /wp-content/plugins/ )
  2. Unzip the file
  3. Activate the plugin through the ‘Plugins’ menu in WordPress

Caching support (WP Super Cache and W3 Total Cache)

If you are using WP Super Cache, move the shrimptest-cache-plugin.php file to the plugins/wp-super-cache/plugins/ and make sure your WP Super Cache is in Half On mode. ShrimpTest support for WP Super Cache does not work if WP Super Cache is in Full On mode.

If you are using W3 Total Cache, move the shrimptest-cache-plugin.php file to the plugins/w3-total-cache/plugins/ and make sure W3 Total Cache’s Page Cache is using the “Disk (basic)” method. ShrimpTest support will not work with the “Disk (enhanced)” method.

If you use any caching plugin without the ShrimpTest support, your experiment results will be invalid.

Contributors & Developers

“ShrimpTest” is open source software. The following people have contributed to this plugin.

Translate “ShrimpTest” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • July 5, 2010 beta


  • late July beta


  • late August beta


  • updated for WordPress 3.1 compatibility
    • takes advantage of new Admin Bar functionality
  • some minor bug fixes


  • some security patches (thanks Mark Jaquith!)
  • minor bug fixes