A clean, minimal, open-source Android calculator app built with Kotlin & Jetpack Compose. No ads. No tracking. No internet permission. Just a calculator.
- ✅ Clean, minimal calculator with retro circular keys
- ✅ Live results — see the answer as you type
- ✅ Scrollable expression display — no more truncated numbers
- ✅ Calculation history saved locally with Room database
- ✅ Unit Converter — Length, Weight, Area, Volume, Temperature, Time, Speed, Pressure
- ✅ Theme customization — 12 preset accent colors + custom hex input
- ✅ Your chosen color persists across sessions
- ✅ Hand-drawn custom app icon
- ✅ A little easter egg 🤫
- ✅ 100% offline — nothing ever leaves your device
- F-Droid (recommended, updates automatically): f-droid.org/packages/com.rr.numio
- GitHub: get the latest APK from Releases
- Android 7.0 (API 24) or higher
GPL-3.0 — see LICENSE
Issues and pull requests are welcome! If you find a bug or have a feature idea, open an issue.
This is my first ever coding project, built from scratch with no prior coding experience — with the help of Claude AI as my coding assistant.
With Lo❤️e, R.R