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Nucleus vs Kalzium: catalog facts
Nucleus	Kalzium
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source as part of the KDE applications.
Linux	Linux
Native GTK4 and libadwaita interface Includes isotope data for the elements	Detailed data for every element Molecular weight calculator and stoichiometry solver
Linux only Small project with a single main maintainer	Only Linux is listed as a platform Reference tool rather than a guided course
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0-or-later
No account 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 September 24, 2026

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