DumberKit: Calculator 1.1.0
Calculator, unit and currency converter for keypad phones
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3.04 MB · dumberkit-calculator.apk
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About DumberKit: Calculator
A calculator, unit converter and currency 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.
Keys
o 0-9 - type numbers
o * - add an operator, press it again for the next one (+ - x /)
o Hold * - a palette of symbols laid out like the keypad: ^, ?, parentheses, %, +-
o # - decimal point
o OK or Call - show the result
o Back - delete the last character; hold it to clear everything
o ? / ? - go through the history
o - switch between Calculator, Unit converter, Currency converter and Settings
Features
o The usual order of operations and exact decimals (0.1 + 0.2 = 0.3)
o History like a paper tape, cleared when you close the app
o Unit converter for length, area, volume, mass, temperature, time, speed, pressure and energy, in both directions
o Currency converter with about 30 currencies at the European Central Bank's rates, works offline with the last ones
o Copy the result, or take a converted value over to the calculator
o System, light, dark, dark red and custom themes, a keypad-friendly color picker, blue or any other icon color
o No ads, no tracking; internet only for the ECB's currency rates
Based on Fossify Calculator (GPL-3.0), keypad input inspired by Calc-U-Later.
License: GPL-3.0-only
Keys
o 0-9 - type numbers
o * - add an operator, press it again for the next one (+ - x /)
o Hold * - a palette of symbols laid out like the keypad: ^, ?, parentheses, %, +-
o # - decimal point
o OK or Call - show the result
o Back - delete the last character; hold it to clear everything
o ? / ? - go through the history
o - switch between Calculator, Unit converter, Currency converter and Settings
Features
o The usual order of operations and exact decimals (0.1 + 0.2 = 0.3)
o History like a paper tape, cleared when you close the app
o Unit converter for length, area, volume, mass, temperature, time, speed, pressure and energy, in both directions
o Currency converter with about 30 currencies at the European Central Bank's rates, works offline with the last ones
o Copy the result, or take a converted value over to the calculator
o System, light, dark, dark red and custom themes, a keypad-friendly color picker, blue or any other icon color
o No ads, no tracking; internet only for the ECB's currency rates
Based on Fossify Calculator (GPL-3.0), keypad input inspired by Calc-U-Later.
License: GPL-3.0-only
| Release info | Update on Oct 16, 2026 |
|---|---|
| Release notes | DumberKit: Calculator gets a currency converter. New o Currency tab before the settings (dollar and yen icon): about 30 currencies at the reference rates of the European Central Bank, with the same two rows and keys as the unit converter - digits and # type the amount, ? / ? pick the row, OK lists all currencies, * swaps them o The rates are downloaded when you open the tab and the ones on the phone are a few hours old, or from the menu; nothing runs in the background. Offline the converter keeps working with the last rates, a copy that comes with the app covers the very first start. The line under the converter shows when the rates were downloaded o The app now asks for internet access - used only to download the ECB's rates Fixed o The warning "You are using a fake version of the app", which showed up now and then, is gone o The selected button in dialogs is much easier to see o On phones with an on-screen navigation bar the tabs and the last rows of About stay above it Install dumberkit-calculator.apk over the previous version, your settings stay. Requires Android 8.0 or newer. |
| Listing data | F-Droid |
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