Arith

Arith is a clean, fast and private calculator for everyday math and beyond.

Standard calculator

• Large, readable display with a live result preview as you type

• Percent, brackets, +/- and backspace that just work

• Correct order of operations (2 + 3 × 4 = 14), with clean error messages for divide-by-zero and overflow

Scientific mode

• sin, cos, tan and their inverses, ln, log, e^x, 10^x

• x², xʸ, √, π, e, factorial, 1/x, |x|

• Degrees / radians toggle

• Scientific keys on one tap, or automatically in landscape

Unit converter

• Length, area, volume, weight, temperature, speed, time and data

• Instant results, swap units with one tap

Tip calculator

• Set the tip percentage with a slider or quick buttons and split the bill between any number of people

More

• Calculation history that stays on your device — tap any entry to reuse it, clear it any time

• Copy and paste results

• Haptic feedback on every key

• Dark and light theme, following your system setting

• Designed for one-handed use with generous spacing and refined typography

Private by design

• No ads, no analytics, no tracking, no accounts

• No Internet permission — the app cannot send anything off your device

• Only permission used: Vibrate (for the key tap)

Arith is free, lightweight and works completely offline.