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OmniOutliner vs TreeSheets: catalog facts
OmniOutliner	TreeSheets
Paid One-time purchase or subscription covering all Apple platforms, with a 14-day free trial.	Free The open-source software is available without a license fee. Hosting, hardware and…
macOS, iOS	Windows, macOS, Linux
Columns, including smart columns for calculations Attachments inside outlines	Combines hierarchical outlines with spreadsheet-like structure.
Apple platforms only Paid after the trial	Its nested-grid workflow takes some adjustment for new users.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Zlib
Not stated if an account is 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 September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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