This app was mentioned in 3 comments, with an average of 4.67 upvotes
Piggy backing off the top comment: That's the Mondo logo.
See here: https://play.google.com/store/apps/details?id=co.uk.getmondo
Look at it on your phone, same graphic at the top. They're launching on Android. Big deal for the UK Android users. I already have a card, it's great for going abroad and managing money. I've been part of the Beta on Android and the app is moving along well.
Edit: Looks like they said it's a Mondo event in a reply.
Monzo: https://play.google.com/store/apps/details?id=co.uk.getmondo&hl=en_GB
Starling: https://play.google.com/store/apps/details?id=com.starlingbank.android&hl=en_GB
Starling takes less phone storage and you can withdraw more cash.
I would go for a good old credit card such as Barclaycard Platinum or Tandem.