This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.




  • One Way (Like), Two Way (Up/Down Vote), Star (range out of 5) and Polls with multiple answers are supported
  • Better rating/popularity sorting for metrics (Lower Bound of Wilson Score for Two-Way and Bayesian for 5-Star ratings)
  • Multiple style options for one-way and two-way metrics
  • Same metric for multiple content makes tracking metrics easier.
  • AJAX voting and fetching support
  • NodeJS & support (with CTLT_Stream plugin)
  • Hooks into pre_get_posts to change sort order / criteria given URL parameters

Please check out FAQ for usage details!


  • Metrics displayed underneath the post
  • Customizable styles
  • Admin main page
  • Metric details view


  1. Install Evaluate by uploading the evaluate folder in your wp-content/plugins directory.
  2. Activation for the first time will create the necessary tables for Evaluate to function.
  3. Thats it! Evaluate supports Multisite too.

You will see Evaluate in the Settings section of the admin page.


Creating and using metrics

Metrics are what Evaluate uses to keep track of votes for content on your site (like posts, pages, or any public custome post type).
These can be questions like “Was this article helpful?”, or be untitled and just have an internal name.
Metrics are usually associated with more than one content. They are displayed in order after the main post content.
Metrics will have a type and style associated with them. These are:

  • One way
    • Thumbs
    • Arrow (Chevron)
    • Heart
  • Two way
    • Thumbs
    • Arrow (Chevron)
  • Range (5-Star Rating)
  • Poll

Note: extending/customizing the styling options is quite easy (by just changing img/sprite.gif or through css/evaluate.css).

Displaying/Hiding Metrics

By default, Evaluate will display metrics for all content from the type you specified while creating the metric.
So, if you create a metric for ‘pages’, then that metric will be displayed on all content that is a ‘page’.
If you want to exclude a particular metric from a specific post or page (or custom post type) you can use the Evaluate
meta box in the admin post area which lets you choose metrics that you want to exclude from that post.

How are metrics scored?

Evaluate scores the content that belong to a metric by user votes. For one-way (such as a Thumbs Up! for posts), this is just how many votes it has received.
For two-way (up/down vote) metrics, the lower bound of the Wilson Score interval is calculated.
This tries to better approach the ‘real’ ratio of up versus down votes than other methods as explained in How Not to Sort by Average Rating.
Star rating scores are calculated by a simple Bayesian estimate (tending towards 2.5/5). Polls are not given a score, but their answers are of course expressed in percentages.

Sorting content by metric score

You can add the arguments ?evaluate=sort&metric_id=<my_id> to any page that displays content to sort it by its Evaluate score. Adding order=<asc|desc> will determine the order.


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Contributors & Developers

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


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Interested in development?

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



  • Initial release