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

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