Troika Top Up is an Android app developed by SPUTNIK LLC that allows Moscow public transport users to instantly check the balance of their Troika card and purchase tickets online to record it directly onto the card using an NFC-enabled and compatible device. The app supports more than 90 ticket types, including MCD, MCR, and tickets for social cards, and electronic purse is a type of electronic ticket that allows passengers to choose the recorded (purchased) amount.

It is important to note that not every NFC-equipped smartphone supports reading contactless chips used in the Troika cards due to hardware limitations. Electronic tickets are stored in the memory of a Troika card, so an NFC-enabled and compatible smartphone is required to write tickets onto the card. To use the app, users must enter their payment card details to reserve funds, which are charged only upon the successful writing of a newly purchased ticket. Overall, Troika Top Up is a must-have app for Moscow public transport users who want to make their travel experience more convenient and hassle-free.