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Kalk vs Numi: catalog facts
Kalk	Numi
Free Free and open source under the GPL-3.0-or-later.	Freemium Free to download, with a paid license offered on the website.
Linux	Windows, macOS, Linux, Command line
Adapts to desktop and phone screens Regular releases with KDE Gear	Write calculations as natural text with variables Built-in currency, unit and time zone conversion
Linux only Few details on advanced features in the research	Licensing terms are set by an end user license agreement rather than an open license Not a scientific or graphing calculator
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.