There is definitely a web interface on the way
& you can get a sense of what a desktop app might look like by checking out Quids. But since Monzo are mobile first, I’m not expecting too much development in this area. So…
although that is how the interaction has been described, I’m actually expecting something a little bit different. I assume that the marketplace (price comparison / app store) will be built into Monzo’s app. But my guess is that the app will become a hub for interaction with the other provider’s apps & data, a bit like Slack. A really simple example of this would be retrieving your Uber receipt from their API so that you can view it from your transaction record, an integration that was built here & discussed by Tom (along with Monzo’s approach to handling other integrations) here.
I can’t see them building a UI that can handle lot’s of different provider’s products because that would seriously restrict the speed of implementation for new partners & the number of provider’s whose products they could offer. Since they will be relying on referral fees for helping sell those provider’s products, that would be a bit of a disaster!