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

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