The Revolut wallet is awesome. It can freely translate USD, GBP or EUR and offers withdrawals and money transfers basically at mid-market exchange rates without any fees which has saved me a lot of money, and I use it all the time.
However, the app is really buggy -- the support chat feature crashes on me every time I use it, and I believe that the app has also resulted in some iPhone battery issues for which I had to completely reset the iPhone.
Please fix these bugs as soon as you can!
Garda2048 about Revolut: Send, spend and save