A calculator and unit converter for keypad phones like the Qin F21, Dumber Mini or Doov R77 Pro. There are no on-screen buttons: you type the calculation straight on the keypad and press OK for the result. Touch is switched off inside the app, so nothing gets pressed by accident in your pocket. <b>Keys</b> • 0–9 – type numbers • * – add an operator, press it again for the next one (+ − × ÷) • Hold * – a palette of symbols laid out like the keypad: ^, √, parentheses, %, ± • # – decimal point • OK or Call – show the result • Back – delete the last character; hold it to clear everything • ↑ / ↓ – go through the history • ← / → – switch between Calculator, Unit converter and Settings <b>Features</b> • The usual order of operations and exact decimals (0.1 + 0.2 = 0.3) • History like a paper tape, cleared when you close the app • Unit converter for length, area, volume, mass, temperature, time, speed, pressure and energy, in both directions • Copy the result, or take a converted value over to the calculator • System, light, dark, dark red and custom themes, a keypad-friendly color picker, blue or any other icon color • No ads, no tracking, no internet access Based on Fossify Calculator (GPL-3.0), keypad input inspired by Calc-U-Later.