Calculator²

I have this app on my phone, tablet, and computer. It is the same in all three places. Love It. I am an engineer, and I use this app every day. It does everything I ever need. I e-mailed the author about a suggestion, and he responded. He said it was a good idea, and it will be in his next update. The program is easy to use, powerful, fast, and cross-platform consistent. I highly recommend it.

As an engineer, I can say this calculator is a must. Has every function, constant, and unit I use on a daily basis. Although it doesn't not have more complex features like graphing or calculus, it does arithmetic simply and quickly. As far as a free calculator applications go, this is the best I used on any platform. If you need more powerful mathematical analysis, I recommend using Wolfram Alpha or it's offline counterpart Mathematica, neither of which is free.

**Edited** It has all the functions you could ask from a scientific calculator, it's stable and well adapted to win10. It shrinks in a smart way too when you are in tablet mode, unlike some apps that don't seem to realize what OS they are in. However, there are some flaws: 1) I can't figure out how to erase things when I have a longer calculation. I can only clear all of it, or the last digit. But I can't go back and fix just a part of it. 2) I wish that you could click anywhere in the calculation you're doing and edit, or re-use and edit an old entry.