I think a great feature for the app, especially for travelling would be a way of viewing the funds currently in your account in whichever currency you like.
Say you are only planning on using your Monzo card abroad, it would be handy to see your total funds in a local currency rather than trying to convert it yourself.
Better still, this feature could be applied to pots, so if you need to set aside funds for holiday and travel spends, you can see how much you’ve saved in the currency you will need!
For example, you could have a pot called ‘Holiday Spends’ for your holiday to Greece, and rather than showing that you’ve saved £100 it would show you how much you have saved in euros!