Very good idea, good visual design. But there are so many wrong things with it: 1. It not only requires login but also knowing the age range. 2. It lacks a lot of functions, not even squares or roots. 3. No natural display. 4. A compliment for the computer would be amazing.
Need login Need login and is not stand alone.
Why the hell do you need the age?
Login with google?
Long way until it gets good. Blinking banner ads at the bottom; full-screen ads; both the bottom ad and the keyboard obscure a portion of the interface (without being able to scroll)...
Added Google account login feature.
Minor fixes for better usability.
Install Calculator for ALL COMPLEX MATHEMATICAL OPERATIONS is calculated easily