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Digital Calculator vs Unitto: catalog facts
Digital Calculator	Unitto
Free Free and open source under the MIT licence.	Free Free with no ads or in-app purchases; open source under the GPL-3.0.
Android	Android
Works with an external Bluetooth keyboard Dark theme that follows the system setting	Calculator, unit, currency, date and time zone tools in one app No ads, in-app purchases or analytics
Basic arithmetic calculator rather than a scientific one Development is infrequent	Android only Currency conversion needs an internet connection for rates
Downloadable app	Downloadable app
Open source	Open source
License: MIT	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.