YNAB Mobile Budget Viewer
I do not plan on adding any more to this for several reasons. The first of which is I have stopped using YNAB as I’ve switched to Moneywell. The second reason is that there is now an official YNAB app for the iPhone. You are welcome to download the Budget Viewer code or fork the github repository to continue this project if you like. But if you have an iPhone I recommend clicking the first link and going with the official app.