# Requirements and compatibility
In order to work, XT YouTube Optimizer (opens new window) requires the following server software environment:
- Joomla! 3.9, Joomla! 4, or superior. Please, download the latest version at Joomla! (opens new window).
- PHP 7.1, or superior - General-purpose server-side scripting language for web development and a popular open-source database system.