Editor's Review
Android already ships with a calculator, so a replacement has to earn its place. TricolorCat's earns it by being quick and unfussy: a large keypad, results that update as you type, and a history tape you can scroll back through instead of retyping a figure you already worked out. Ten million installs and a 4.2 average suggest that formula lands for most people.
The scientific keypad appears when trigonometry, powers or logarithms are needed and stays out of the way when they are not, which keeps the everyday layout from turning into a wall of tiny buttons. Themes let you set it light or dark to match the rest of the phone.
Two things to know before installing. Google Play lists this as a paid title rather than a free one, a hard sell in a category stuffed with capable free options, and it deliberately stops short of the unit conversion, currency rates and graphing that some rivals pile on. If you want a calculator that does one job cleanly, that restraint is the whole point. If you wanted the extras, this is not where they are.
Features
Large keypad with results that update live as you type
Scrollable history tape you can pull earlier results from
Scientific keypad for trigonometry, powers and logarithms
Light and dark themes
Pros
Opens and calculates without any delay
The history tape saves retyping long numbers
Clean layout that never buries the basic keys
Cons
Costs money in a category where good free options are everywhere
No unit or currency conversion built in
