Weather apps seem like a good UI playground. Lots of different types of widget, and if you change the UI it's not a big deal. Changing the UI for something more

Weather apps seem like a good UI playground. Lots of different types of widget, and if you change the UI it's not a big deal. Changing the UI for something more complex that people had to learn and now have to relearrn, in software that people work with (rather than just getting info from), tends to be really negative for users. Much less the case for a weather app I think than a calculator.