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GanttProject vs OpenProject: catalog facts
GanttProject	OpenProject
Free Free to use with no subscription; an optional cloud service is also available.	Freemium Free open-source edition to self-host; hosted and paid plans start with a free trial.
Windows, macOS, Linux	Web, Self-hosted
Runs offline with data stored locally Opens Microsoft Project MPX, MPP and XML files	Supports classic Gantt and agile boards in one tool Can be installed on-premises
Lacks some high-end enterprise features of Microsoft Project Exports to Microsoft Project only in XML/MSPDI format	Running your own instance needs server administration Some features are reserved for paid plans
Downloadable app	Web application, Self-hosted, Hosted service
Open source	Open 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 September 23, 2026

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