Jordi Cabot

seriouswp

Once a site starts growing, it always ends up with repeated tags and categories. Sometimes, you create a new category when you were before using a tag. Or you just forget about old tags and en up writing new ones with a very similar name.
This damages the organization your content and the quality of the user navigation on your site.
This plugin helps you to quickly identify (too) similar tags and categories and gives you the option to merge them to simplify your site taxonomies.
In the Configuration page you can define how close term names should be to be considered duplicates.
In the Analysis page you can review the duplications and decide which ones to merge.

Serious Duplicated Terms

Ideal to remove some (quasi)duplicated terms and clean and sort out better your tags and categories

You'll be surprised to see how many duplicated terms you have!

Merge duplicated tags and categories to simplify and better organize the content and navigation of your site

markusseyer

A plugin that finds duplicate and similar posts based on their post_content or post_title similarity. You can define the percentage of similarity, post type and post status. The plugin is a great utility to find duplicates that differ in only a few characters.
<ul>
<li>Search for duplicate posts</li>
<li>Search for similar posts</li>
<li>Define post types</li>
<li>Define post statuses</li>
<li>Define value of similarity</li>
<li>limit by date</li>
<li>Support for custom post types</li>
<li>Two-click-delete posts in result list</li>
<li>Multi-language interface</li>
</ul>

Find Duplicates

Плагин хоть и старый но работает отлично. Лучшего решения не нашел для данной задачи.

Отлично

The plugin finds duplicate or similar posts based on their post_content or post_title similarity. You can define the percentage of similarity and othe …

Serious Duplicated Terms vs Find Duplicates