Cannot use keyboard input.
Massive drawback and total dealbreaker for me using this relative to the regular calculator app. Anyone who works with financial numbers enough to want this app surely will have the same problem. Also cannot resize the calculator or text, so very difficult to see on small pixel monitors using full resolution.
I wanted something that would allow me to do simple financial functions without firing up a spreadsheet. Waste of $1.99 if I can't type in numbers with the keyboard. Seriously, who would make a calcluator app that doesn't allow this?