Waltti Card Reader is a free Android application developed by LMJ TVV lippu- ja maksujärjestelmä Oy. It falls under the category of Travel & Navigation, and its main purpose is to check the validity of Waltti travel and single-charge cards.

The app uses the NFC feature of your phone to display the current season tickets, remaining value, latest value ticket, and previous tickets when you place your phone against the card. You can also receive a receipt of your latest value ticket by sending the ticket details to your email. Make sure to turn on the NFC feature of your phone before using the app.