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OmniPlan vs GanttProject: catalog facts
OmniPlan	GanttProject
Paid Bought once or by subscription, with a free 14-day trial.	Free Free to use with no subscription; an optional cloud service is also available.
macOS, iOS	Windows, macOS, Linux
Interval and effort tracking with customizable resources Multi-project dashboards across a portfolio	Runs offline with data stored locally Opens Microsoft Project MPX, MPP and XML files
Apple platforms only Paid after the trial	Lacks some high-end enterprise features of Microsoft Project Exports to Microsoft Project only in XML/MSPDI format
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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