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Kalzium vs Avogadro: catalog facts
Kalzium	Avogadro
Free Free and open source as part of the KDE applications.	Free Free and open source.
Linux	Windows, macOS, Linux
Detailed data for every element Molecular weight calculator and stoichiometry solver	Handles systems of thousands of atoms Force fields quickly clean up sketched structures
Only Linux is listed as a platform Reference tool rather than a guided course	Assumes some chemistry background Not a full simulation package on its own
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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