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Unitto vs Fossify Calculator: catalog facts
Unitto	Fossify Calculator
Free Free with no ads or in-app purchases; open source under the GPL-3.0.	Free Free and open source under the GPL-3.0 licence, with no ads.
Android	Android
Calculator, unit, currency, date and time zone tools in one app No ads, in-app purchases or analytics	No internet permission, ads or tracking Calculation history
Android only Currency conversion needs an internet connection for rates	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.