There are some Windows 10 universal apps written by third party developers that work with Splitwise. Here are two we’re aware of:
We can’t endorse these apps specifically, but you may find them useful.Varun Agarwal commented
It is a good suggestion. However having a website makes Windows 10 Universal App redundant. Updating on Desktop whether thru app or website is not much different. However an app on Android is important as it gives the freedom to move around. Windows Phone has just 3% market share. Not worth the time and effort.