Soulvers Features | Acqualia. "Calculator" rethought. I wonder why so many desktop computer calculators desperately try to replicate the UI of old pocket calculators. On mobile devices, it makes sense - the pocket calculator UI with multi-function keys is quite efficient for such small form factors - but on the computer, I much more often simply use a Python shell or an iPython notebook. Soulver is a bit like that, only focused on classic calculations and with linking of lines, so that you can build spreadsheet-like solution sheets. Quite clever.