Pretty much what it says in the name - this will highlight the differences between edits made by users, as long as you have the 'Edit log' setting set to store the edits.

PHP requirements: v7.3 or later

See the following for the background:

See the 'Additional information' for support details.

This application makes use of Caxy Interactive's 'PHP-HTMLDIFF' library, which is available for use under the GNU GENERAL PUBLIC LICENSE (version 2). No modifications have been made to the source code of this library

Website: Caxy Interactive
Repository: GitHub - caxy/php-htmldiff: A library for comparing two HTML files/snippets and highlighting the differences using simple HTML. Includes support for comparing complex lists and tables
License: php-htmldiff/LICENSE at master · caxy/php-htmldiff