With "Rejsekort Status" on your mobile you can always check your balance, see your commuter area or the expiration date of your Rejsekort. Rejsekort Anonymous is not compatible with Rejsekort Status.
Rejsekort Status App is not maintained.
You can instead use the Rejsekort Status function on Rejsekort.dk, if you want to see your balance, commuting area or expiry date.