PlaintainReader is an Android application designed to view the balance of "Podorozhnik" cards for phones with NFC support. It is important to note that the app does not contain any code to overwrite information on the card, nor does it have any capability to change the card balance. Its sole purpose is to provide information about the current balance and the number of trips for informational purposes only.

The application has been tested and works seamlessly on Google Nexus 5x. Overall, PlaintainReader is a simple and effective tool for those who wish to keep track of their Podorozhnik card balance.