Why is my In-Home Display (IHD) balance different from my app balance?

The app balance gets updated once a day after midnight. If you've used energy or topped up since midnight, then your app balance will be out of date. 

It might also be that your meter isn’t communicating with us, in which case your balance won't update in the app. But your IHD will usually communicate with your meter throughout the day to stay up to date.