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Zim vs Obsidian: catalog facts
Zim	Obsidian
Free Free and open source.	Free Free for everyone, including commercial use, in the vendor’s own words. Obsidian Sync and…
Windows, Linux	Windows, macOS, Linux, Android, iOS, Browser extension
Notes stored as plain text files you can edit elsewhere Pages created simply by linking to them	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
Uses its own wiki markup rather than Markdown Desktop only, with no built-in sync or mobile app	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
Downloadable app	Downloadable app, Browser extension
Open source	Closed source
License not stated	License not stated
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 20, 2026

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