A free program for Android, by Tatoonaak Studio.

The calculator app can do simple calculations like addition, subtraction, multiplication, and division. But it can also do a lot more than that. For example, it can calculate the square root of any number, the percentage of any number, and so on.

As you continue to use this tool, you may still visit the previous equations you just performed. Check the history whenever you need to.

So why is it so great? It’s simple to use. Just tap the buttons to get the result. And it’s also very fast.