A free app for Android, by Reference Point.

With the release of Network Rail’s Sentinel, we’re proud to bring you the first mobile app that can read smartcards on Network Rail’s train station sites. This app can also be used by the public to view their smartcard information.

As soon as you open the app, you can select a smartcard from the list that you want to view and then tap the “view” button. If you’re using NFC, you can also hold the smartcard to the back of your device and tap the “NFC” option. This will open a new window where you can tap the “check” option.