OpenCalc
OpenCalc is a free, open-source utility app for Android. Simple and beautiful calculator for Android. It has 1,537 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid and Google Play.
- Android
- Kotlin
- Utilities
- Actively maintained
About OpenCalc
A simple and beautiful calculator for Android Features * Lightweight (APK ~2MB) * No unnecessary permissions * Dark, Light, Amoled and Material You theme * Scientific mode * History * Portrait and landscape orientation * Quick Settings Tile * More...
Privacy and F-Droid
F-Droid builds OpenCalc from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is OpenCalc?
OpenCalc is a free, open-source utility app for Android. Simple and beautiful calculator for Android. It has 1,537 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid and Google Play.
Is OpenCalc free and open source?
Yes. OpenCalc's source code is public on GitHub under the GPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install OpenCalc?
You can install OpenCalc from F-Droid (package com.darkempire78.opencalculator) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v3.2.1).
Is OpenCalc still maintained?
The repository's most recent commit was on Jul 10, 2026. Its F-Droid listing was last updated on Apr 17, 2025. appsgit only lists apps whose repository had a commit in the last six months.