Grand Arena Calculator

Hello mi name is Aleksandr. I am a Belorussian android developer. I create one app for Grand Arena. This app calculate efficency based on score of oponent. Give you an efficency score for win the battle.
Application is only for android and posted to Google Play store.
Link : https://play.google.com/store/apps/details?id=ru.vurogaming.gacalc&gl=US
I cant use UI of SWGOH. If you like the app a can create better app with UI & permission to use EA SWGOH materials.