rysasahrialNumberHub offers a comprehensive open‑source calculator, unit converter, currency converter, date calculator, and time‑zone converter all in one free Android app. Built in Kotlin and distributed under the GPL‑3.0 license, NumberHub is maintained by Myzel394 as the successor to the archived Unitto project . With zero ads, no in‑app purchases, and full source‑code transparency, this powerful tool is ideal for students, travelers, developers, and professionals who frequently calculate math expressions, convert between various units, check exchange rates, manipulate dates, or compare time zones.
The application supports:
- A scientific calculator with trigonometric functions, fractional output, and copy‑paste of results.
- A unit converter covering over 500 units: length, mass, volume, data, temperature, and currency.
- A currency conversion feature powered by the Fawaz Ahmed Currency API, with automatically updating exchange rates via network requests .
- A date calculator for adding or subtracting days, months, or years from any date.
- A time‑zone converter that handles global zones with ease.
By building on Android Jetpack Compose, Room, OkHttp, and other modern Android libraries, NumberHub ensures smooth UX and efficient background update. Since the original Unitto archive in March 2024, Myzel394 has focused on maintenance, bug fixes, and enabling features such as import/export settings, widgets, and improved currency fetching—though no major feature additions are planned. Contributions like pull requests, translations via strings.xml, and donations via GitHub Sponsors or crypto are welcome.
For users of F‑Droid or APK downloaders, NumberHub can be installed directly from IzzyOnDroid’s repository (v0.2.2 released Oct 23 2024), targeting Android 5.0+. It’s also available on Google Play, boasting a 4.6‑star rating and ≈10 k installs. This makes it a trusted, feature‑rich open‑source calculator app that enhances everyday productivity without compromising security or privacy.
- Author: Myzel394 (forked from sadellie’s Unitto)
- Programming language: Kotlin (100%)
- License: GNU GPL‑3.0 (GPL‑3.0‑only)
- License restrictions: Code and app are free to modify and redistribute under GPL‑3.0; any derivative must remain GPL‑3.0.
- Repository link: https://github.com/Myzel394/NumberHub