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Atomic - Periodic Table vs Kalzium: catalog facts
Atomic - Periodic Table	Kalzium
Free Free and open source under GPL-3.0.	Free Free and open source as part of the KDE applications.
Android	Linux
Periodic table and element lookup in an Android app	Detailed data for every element Molecular weight calculator and stoichiometry solver
Android only	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	License: GPL-2.0-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 8, 2026	Official website Full listing and sources Checked September 24, 2026

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