I appreciate the predicted sell value of a single set of turnips, but it won't tell me how much I'm making total.

A field to input the purchased quantity that would be used to calculate amount spent, as well as the return if you sold right now

Obviously I could just do this on a calculator but to have everything stored neatly here and calculated automatically would be awesome.

This isn't super related, but I often jump between devices, and as such having a login system that would sync across devices would be awesome, however, as a web developer, I understand the storage requirements of having such a system.