There’s been a bit of discussion about Loot here previously.
In general I’ve felt that their mobile app was a little lacking. However they’ve just launched a web interface, and IMO they’ve done it really well by the looks of it.
Fully featured web app in React, using service workers, asset compilation through webpack. All the cool things basically.
Here’s a gif of the interface. I have no transactions as I’ve not used my card.
I’d really like to see Monzo release an official web app at some point, because I think Loot have really nailed it here.