Metrodroid
Read data from public transit cards using your NFC Android phone
Metrodroid allows Android users to inspect information stored on compatible contactless public transportation cards using NFC. It can display remaining balances, recent journeys, and other card details when the underlying transit system makes that information accessible. The application recognizes numerous transit card formats used by transportation agencies worldwide. Supported technologies include FeliCa, MIFARE Classic, MIFARE DESFire, MIFARE Ultralight, and ISO-based smart cards. Compatibility covers systems such as Suica, Opal, Clipper, Octopus, and several European transit networks. Its card-specific decoders interpret stored data into readable information. The project also supports multilingual interfaces. Available information varies by card, and some encrypted cards cannot expose complete travel records.