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