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Obsidian vs TiddlyWiki: catalog facts
Obsidian	TiddlyWiki
Free Free for everyone, including commercial use, in the vendor’s own words. Obsidian Sync and…	Free Free and open source.
Windows, macOS, Linux, Android, iOS, Browser extension	Web
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	Whole notebook is one portable HTML file Non-linear notes that can be tagged and linked
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	Saving a single-file wiki from a browser can need extra setup The tiddler model takes time to learn
Downloadable app, Browser extension	Downloadable app, Web application
Closed source	Open source
License not stated	License not stated
No account needed	No account 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 September 23, 2026

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