The Calculator HD Pro has a good history function and has a scientific calculator option. You can also change to one of several color schemes. Most importantly, it also has the three features that I look for in a calculator, and they are remarkably hard to find in Apple Store calculators: 1) when I hit the equal sign repeatedly, it repeats your last function. For example, if I enter 10 + 12 and then hit = repeatedly, the calculator will continue adding 12 to the sum every time I hit = 2) the ability to view and edit a function as you are entering it. For example, if I enter a function adding and multiplying 20 different numbers, and then I realize that I need to change + to * or add a parentheses, I don’t need to reenter the whole equation—I can edit! 3) you can recall a function from your history tab and edit it to tweak your equation! Big time-saver. I don’t love paying for apps since I’m a long-time android user, but if you use your calculator as much as I do, this app is worth it.

How do I start with a negative number? I use the +/- button and it changes the number.

I use this calculator everyday…..

I tried to delete a list in history tape. It will not let me. And emailing support does not work because the link is broken.

Flawless App that has become “family.” It’s that darn good.

Seeing all calculations and the ability to backspace AND save all calculations makes life so much easier. Helps to turn anyone into an organized accountant!

After years of use, this is still my go-to calculator app. Not only are the layouts customizable and easy to read, and the entry easy to modify, but the results can be notated and saved for later recall. Perfect

Simple yet powerful. I use it in my Real Estate business everyday.

Best calculator I have ever used.

Unless you’re an astrophysicist this calculator has everything you need for calculating everything needed! Yea! That’s a bit of a hyperbolic description, but it really does have everything you need: trig, algebra, and lots more, and the more mundane addition, subtraction, multiplication, and division. I’m an amateur astronomer and it can do all I need!!!