GFX Tool For FF & AA is an Android utility launcher that allows users to customize their game graphics to optimize pictures and gameplay. Developed by Nitro App Studio, this application helps users customize their game settings and sensitivity, change graphic settings, unlock FPS limit, and more for better performance.

To use the GFX Tool, users must first close the game if it's currently running. Then, they can open the GFX Tool app and customize the graphics according to their desires and device capabilities. The Sensitivity option can also be customized. Users can select options based on their phone performance and graphics support. Once the settings are applied, users can run the game.

Overall, GFX Tool is a useful app for gamers who want to enhance their gaming experience. The app is easy to use and provides a variety of customization options for graphics and sensitivity. However, it's important to note that this app is only compatible with specific games.