MoneyWiz 2 works on iOS 11 and there are no known issues there.
MoneyWiz 1 will stop working if you install iOS 11 though. The reason behind that is that MoneyWiz 1 was built years ago and we’ve officially stopped supporting it at the end of 2014 when we released MoneyWiz 2. At that time, most apps were still using 32bit architecture, as was MoneyWiz 1. As of iOS 11 though, Apple will no longer allow 32bit apps to run on iOS devices. That essentially means that unless a developer updates their app to 64bit (which is a lot of work in some cases), the app will not work starting iOS 11. Since MoneyWiz 1 is not even on the App Store anymore and we’ve stopped supporting it, as we moved our efforts towards MoneyWiz 2, unfortunately there is nothing we can do to make MoneyWiz 1 work on iOS 11.
We’d highly recommend upgrading to MoneyWiz Premium to assure you always have the latest version of MoneyWiz on all your devices.