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Nucleus vs Atomic - Periodic Table: catalog facts
Nucleus	Atomic - Periodic Table
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under GPL-3.0.
Linux	Android
Native GTK4 and libadwaita interface Includes isotope data for the elements	Periodic table and element lookup in an Android app
Linux only Small project with a single main maintainer	Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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