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OpenCalc vs Digital Calculator: catalog facts
OpenCalc	Digital Calculator
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the MIT licence.
Android	Android
Small download with no unnecessary permissions Scientific mode and calculation history	Works with an external Bluetooth keyboard Dark theme that follows the system setting
Android only No releases published on the GitHub repository	Basic arithmetic calculator rather than a scientific one Development is infrequent
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.