PattyBug

Type the whole sum the way you would write it — brackets, precedence and all. Get it right the first time instead of chaining one operation at a time.

The answer updates as you type, so you can see a mistake before you commit to it.

sin, cos, tan, sinh/cosh/tanh, ln, log, log₂, square and cube roots, powers, absolute value, floor, ceiling and rounding. An INV key flips the trig and log keys to their inverses (sin⁻¹, cos⁻¹, tan⁻¹, eˣ, 10ˣ).

One tap switches the angle mode, and the keypad shows which one is active.

250 + 15% is 287.5, 200 × 10% is 20, and a lone 50% is 0.5 — the way a pocket calculator has always worked.

π and e, factorials, and an Ans key that reuses the last result in the next expression.

Every calculation is saved on the device. Tap a past result to drop it straight back into the display.

A warm ladybug palette that follows your phone or sticks to the setting you pick.

There is no sign-up, nothing plays before a result, and the app never needs a connection. It works with the radio off.

Type any function of x and see it drawn instantly — polynomials, sine waves, 1/x, roots, and anything else the calculator understands.

Drag the graph to move along the x-axis and zoom in or out. The vertical range fits itself to whatever is on screen, so an asymptote never flattens the curve.

Enter two points and get the slope, the angle of the line, its equation y = mx + b, the distance between them and the midpoint — with the line drawn underneath.

Enter a radius and read the diameter, circumference and area, all worked out with π. The value of π is shown too, for anyone who just wants to see it.