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GanttProject vs ProjectLibre: catalog facts
GanttProject	ProjectLibre
Free Free to use with no subscription; an optional cloud service is also available.	Freemium The desktop app is free and open source; the cloud version is a paid service with a trial.
Windows, macOS, Linux	Windows, macOS, Linux, Web
Runs offline with data stored locally Opens Microsoft Project MPX, MPP and XML files	Opens Microsoft Project .mpp and .xml files without conversion Critical path, resource leveling and earned value scheduling
Lacks some high-end enterprise features of Microsoft Project Exports to Microsoft Project only in XML/MSPDI format	Website mostly promotes the paid cloud product Portfolio, AI and risk analysis features are in the cloud version
Downloadable app	Downloadable app, Hosted service
Open source	Open source
License not stated	License: CPAL-1.0
No account needed	Not stated if an account is needed
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.