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Kalk vs Qalculate!: catalog facts
Kalk	Qalculate!
Free Free and open source under the GPL-3.0-or-later.	Free Free and open source under the GPL.
Linux	Windows, macOS, Linux
Adapts to desktop and phone screens Regular releases with KDE Gear	Unit calculations, unit conversion and live currency conversion built in Symbolic calculation including integrals and equations, with arbitrary precision
Linux only Few details on advanced features in the research	Currency rates need an internet connection to update The sheer number of functions and settings is daunting at first
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0
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 September 21, 2026

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