Numio Calculator

Numio is a clean, minimal calculator built with Kotlin and Jetpack Compose. No ads, no tracking, no internet permission — it never needs to talk to the outside world.

Features:

* Clean, minimal design with retro circular keys

* Live results — see the answer as you type

* Scrollable expression display, so long numbers are never truncated

* Calculation history saved locally with a Room database

* Built-in unit converter — Length, Weight, Area, Volume, Temperature, Time, Speed, Pressure

* Theme customization — 12 preset accent colors plus custom hex input

* Your chosen theme color is remembered across sessions

* Hand-drawn custom app icon

* A small hidden easter egg

* 100% offline — nothing ever leaves your device

This is a first solo project, built from scratch and open-sourced so anyone can use, inspect, or contribute to it.