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Things 3 vs One Thing: catalog facts
Things 3	One Thing
Paid One-time purchase, priced separately for Mac, iPhone and iPad.	Free Free to download, including from the Mac App Store.
macOS, iOS	macOS
Clean, well-regarded design Quick to learn	Keeps one chosen task visible in the menu bar Accepts text by drag and drop or share actions
Apple platforms only Each platform version is bought separately	Requires macOS.
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 23, 2026	Official website Full listing and sources Checked October 8, 2026

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