Having become a recent user of Revolut, one of their features provides really great UX and saves a minute or so per transaction.
Basically, instead of transferring money into Monzo via your other Bank App or Website, it allows deposits via Apple Pay. You simply select the bank card and Face ID does the rest… simple.
I’m under no illusion this is a game changer, and I am aware there are other multiple ways to ‘add money’ to Monzo, I feel Apple Pay is the most seamless for iOS users.