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Fossify Calculator vs OpenCalc: catalog facts
Fossify Calculator	OpenCalc
Free Free and open source under the GPL-3.0 licence, with no ads.	Free Free and open source under the GPL-3.0 licence.
Android	Android
No internet permission, ads or tracking Calculation history	Small download with no unnecessary permissions Scientific mode and calculation history
Not a full scientific or graphing calculator Android only	Android only No releases published on the GitHub repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
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.