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OpenCalc vs Unitto: catalog facts
OpenCalc	Unitto
Free Free and open source under the GPL-3.0 licence.	Free Free with no ads or in-app purchases; open source under the GPL-3.0.
Android	Android
Small download with no unnecessary permissions Scientific mode and calculation history	Calculator, unit, currency, date and time zone tools in one app No ads, in-app purchases or analytics
Android only No releases published on the GitHub repository	Android only Currency conversion needs an internet connection for rates
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	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.