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Kalzium vs Nucleus: catalog facts
Kalzium	Nucleus
Free Free and open source as part of the KDE applications.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Detailed data for every element Molecular weight calculator and stoichiometry solver	Native GTK4 and libadwaita interface Includes isotope data for the elements
Only Linux is listed as a platform Reference tool rather than a guided course	Linux only Small project with a single main maintainer
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	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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