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Numi vs Kalk: catalog facts
Numi	Kalk
Freemium Free to download, with a paid license offered on the website.	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Linux, Command line	Linux
Write calculations as natural text with variables Built-in currency, unit and time zone conversion	Adapts to desktop and phone screens Regular releases with KDE Gear
Licensing terms are set by an end user license agreement rather than an open license Not a scientific or graphing calculator	Linux only Few details on advanced features in the research
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is 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.