Each time I make a transaction, the transaction gets rounded up and the spare change gets added to my vault. This is fantastic, but less fantastic is the clutter it makes afterwards when you make more than a few transactions each day.
What I suggest you (Revolut) does to clean up, is to take the Monzo approach. Instead of creating a single transaction line for each addition to the vault, show a vault icon next to the transaction stating that it has been rounded up and added to the vault. Then, when clicking in to the transaction you can see exactly how much was added to what vault. You can also add the option to see how much cashback the transaction gave, for those who have Revolut Metall.
This is how Monzo solved the issue