I agree that we really need a Universal Windows Platform (UWP) app. I have a Windows Phone and a Surface tablet, and it would be great to be able to use Revolut on these devices while travelling. The market share argument is null and void: Windows 10 has 300 million installs and rising, and a UWP app would run on everything from Windows tablets to PCs to Xboxes and Windows Phones. I hate having to use Bluestacks on my laptop to be able to operate my Revolut account, and of course I can’t use the geolocation security features of Revolut if I’m not travelling with my laptop.
A web interface and a UWP Windows 10 app would be easy to co-develop. There are easy tools to port a web interface to UWP in order to enable Windows 10 notifications to PC and phone with almost zero extra coding. I’m not talking about a basic web wrapper, there are more sophisticated tools than that provided for free by Microsoft. Everything from Xamarin which allows for code once and publish on all platforms, to Hosted Web Apps using Visual Studio.