Arith

Arith is a clean, fast and private calculator for everyday math and beyond. It opens instantly, works completely offline and never shows an ad.

What it does
Arith handles everyday sums, scientific calculations, unit conversions and tip splitting in one small app, and keeps a history of everything you calculate.

Features
• Standard calculator with a large display and a live result preview as you type
• Correct order of operations, percent, brackets, +/- and backspace
• Scientific mode: sin, cos, tan and inverses, ln, log, e^x, 10^x, x², xʸ, √, π, e, factorial, 1/x, |x|, degrees/radians toggle
• Memory keys: MC, MR, M+, M− and Ans (last answer)
• Calculation history: up to 200 entries saved on your device. Tap to reuse a result, long-press to reuse the expression, copy or delete, swipe to remove one entry
• Unit converter: length, area, volume, weight, temperature, speed, time and data
• Tip calculator with bill splitting
• Light, Dark or Follow-system theme; haptic key feedback; keep-screen-on option
• English and Hindi interface

What makes Arith different
• No ads, no analytics, no tracking and no accounts — ever
• No Internet permission at all, so the app cannot send anything off your phone. The only permission is Vibrate, for the key tap
• Under 2 MB, opens instantly and works fully offline
• Scientific functions, history, converter and tip calculator are all included — nothing is locked behind a purchase

Website: arith.pages.dev
Contact: arithapp@proton.me