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Uno Calculator vs Kalk: catalog facts
Uno Calculator	Kalk
Free Free to use; the underlying calculator code is under the Apache-2.0 licence.	Free Free and open source under the GPL-3.0-or-later.
macOS, Linux, Android, iOS, Web	Linux
Familiar Windows Calculator layout on other systems Scientific and Programmer modes	Adapts to desktop and phone screens Regular releases with KDE Gear
Initial load can be slow Built mainly as a framework showcase	Linux only Few details on advanced features in the research
Downloadable app, Web application	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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