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KCalc vs Kalk: catalog facts
KCalc	Kalk
Free Free and open source under the GPL-2.0-or-later licence.	Free Free and open source under the GPL-3.0-or-later.
Linux	Linux
Scientific, statistics and numeral system modes Results stack for recalling previous answers	Adapts to desktop and phone screens Regular releases with KDE Gear
No graphing Best integrated with KDE Plasma	Linux only Few details on advanced features in the research
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0-or-later
No account needed	No account needed
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.