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GanttProject vs Instagantt: catalog facts
GanttProject	Instagantt
Free Free to use with no subscription; an optional cloud service is also available.	Freemium Free plan available, with paid plans for more features.
Windows, macOS, Linux	Web
Runs offline with data stored locally Opens Microsoft Project MPX, MPP and XML files	Drag-and-drop Gantt scheduling with dependencies Baselines and milestones
Lacks some high-end enterprise features of Microsoft Project Exports to Microsoft Project only in XML/MSPDI format	Focused on timelines rather than full work management Hosted only
Downloadable app	Web application, Hosted service
Open source	Closed source
License not stated	License not stated
No account needed	Account 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.