Koleje Mazowieckie is a free Android app developed by Koleje Mazowieckie - KM sp. z o.o. It is designed to allow users to purchase train tickets for trains operated by KM. With the app, you can buy tickets for yourself and your family by creating user profiles in your account.

The app also enables you to purchase a periodic ticket upon creating a virtual Mazovian card. You don't need internet access to show your ticket to the controller, as it's also available offline. The app sends you notifications when your periodic ticket is about to expire, and you can "memorize" your multi-pass ticket for future purchases. Additionally, if you choose a cyclical payment method on the payment screen, your ticket will renew automatically. The app offers you secure payments, including deferred payment that can also be split into installments. With this payment method, you can pay for long-term tickets even up to 30 days after purchase.