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OpenCalc vs Vanilla: catalog facts
OpenCalc	Vanilla
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 license.
Android	Android
Small download with no unnecessary permissions Scientific mode and calculation history	Lightweight app No permissions needed, according to its project description
Android only No releases published on the GitHub repository	Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is 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 8, 2026

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