Twitter Not X is a free Chrome add-on developed by polandeme. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This program allows users to customize their browsing experience by changing various elements to resemble the popular social media platform, Twitter.

With Twitter Not X, users can easily transform their browser to have a Twitter-like appearance. The add-on offers features such as changing the program logo and favicon to the iconic Twitter blue bird. Additionally, users have the option to modify the loading logo and even the URL to reflect Twitter.

While the program's name suggests it is about Twitter, it also provides the option to change everything to resemble Google Plus. However, it is important to note that this program strictly focuses on visual customization and does not provide any actual Twitter or Google Plus functionalities.

Overall, Twitter Not X is a simple and free add-on for Chrome users who want to give their browsing experience a Twitter-inspired look.