A lightweight, open-source calculator app for Android with scientific mode, multiple themes, and no unnecessary permissions.
OpenCalc is an open-source calculator application for Android that provides a simple yet powerful calculation experience. It solves the problem of bloated, permission-heavy calculator apps by offering essential features in a lightweight package that respects user privacy. The app includes scientific functions, calculation history, and multiple theme options while maintaining a small footprint.
Android users who need a reliable, privacy-respecting calculator app without unnecessary bloat or permissions. Particularly suitable for students, professionals, and privacy-conscious individuals who perform basic to advanced mathematical calculations.
Developers choose OpenCalc for its commitment to privacy (no unnecessary permissions), lightweight design (~2MB APK), and fully open-source nature under GPLv3. Unlike many calculator apps, it provides advanced features while maintaining transparency and user control.
A simple and beautiful calculator for Android downloaded more than 300k times
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With an APK size of only ~2MB, it minimizes storage and memory usage, making it ideal for older or resource-constrained Android devices.
Requires no unnecessary permissions, as highlighted in its philosophy, ensuring user data protection without invasive tracking.
Supports Light, Dark, Amoled, and Material You themes, allowing personalized appearance that adapts to Android system preferences.
Includes advanced mathematical functions in scientific mode, catering to complex calculations while maintaining a clean interface.
The shift from mXparser to a custom implementation, as noted in the FAQ, may introduce accuracy issues or lack the robustness of established libraries, despite being lighter.
Unlike many advanced calculator apps, it does not offer graphing features, limiting its utility for visual mathematics and educational purposes.
Exclusively available for Android 5.0+, so users on iOS, web, or desktop platforms cannot access it, reducing its cross-platform appeal.