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