Compare software

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

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