АЗС Expert is a free loyalty program app for Android devices, developed by Expert LLC. With this app, users can create a virtual loyalty card, view their balance, and track their transaction history. Additionally, the app allows users to locate all the "Expert" gas stations on a map.

The app's main feature is the ability to use a QR code within the app to earn and redeem loyalty points. This feature allows users to easily accumulate points and redeem them for rewards. Overall, the app is a useful tool for those who frequently visit "Expert" gas stations and want to be rewarded for their loyalty.