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.