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Unitto vs SoulCalc: catalog facts
Unitto	SoulCalc
Free Free with no ads or in-app purchases; open source under the GPL-3.0.	Free Free and open source under the MIT licence.
Android	Android, iOS
Calculator, unit, currency, date and time zone tools in one app No ads, in-app purchases or analytics	Multi-line calculations with results shown beside each line Named variables reusable across lines
Android only Currency conversion needs an internet connection for rates	Small project with few commits No dedicated website or documentation beyond the README
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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 2, 2026

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