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Obsidian vs Lemma: catalog facts
Obsidian	Lemma
Free Free for everyone, including commercial use, in the vendor’s own words. Obsidian Sync and…	Free Free and open source under the GPL-3.0-or-later licence, with optional donations.
Windows, macOS, Linux, Android, iOS, Browser extension	Linux
Notes are plain Markdown files in a folder you control, readable without the app Linking, backlinks, tags, graph view and fast search across the vault	Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks
The application is not open source, only the plugin ecosystem and the releases repository Syncing between devices means paying for Obsidian Sync or wiring up your own sync tool	Linux only No sync described on the homepage
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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