Kal

Kal is a simple calculator that focuses on being quick and easy in complex situations. Like, say, doing your finances. It's also designed to help you rely on your own memory less. The entirety of the math expression you've typed in is kept in view while you work.
Free features:
See everything you've entered so far as you work through a problem!
Premium Features
- Edit what you've typed in
- Quickly copy and paste values
- Keep a history of the calculations you've done.
- Recall an item from history (either answer or entire expression) into your current calculation
You can subscribe monthly just to try it out for super cheap or go all out and unlock everything for life with a single payment.