Gmail Old UI is a Chrome add-on developed by Dima PM. It aims to restore the old user interface of Gmail on desktop, providing a familiar and usable experience for users who prefer the previous version.

With this add-on, users can bring back the classic Gmail interface, which includes features like a compact layout, a more straightforward design, and a simpler navigation menu. By installing Gmail Old UI, users can easily switch between the old and new interfaces, giving them the flexibility to choose the one that suits their preferences.

Overall, Gmail Old UI offers a quick and convenient solution for those who find the new Gmail interface less intuitive or prefer the familiarity of the old design. It is a free add-on available on the Chrome Web Store, making it easily accessible to all Chrome users.