GanttProject vs Microsoft Project 2026: Free Open Source vs Enterprise PM

TL;DR: GanttProject vs Microsoft Project in 2026

GanttProject is better when you need a completely free, offline-capable Gantt tool with no subscription, no user limits, and no IT procurement process — it handles dependencies, critical path, baselines, and MS Project file compatibility at zero cost on Windows, macOS, and Linux. Microsoft Project is better when your organization runs inside the Microsoft 365 ecosystem and needs enterprise resource management, project financials, portfolio roadmaps, and real-time cloud collaboration backed by IT governance — Plan 3 at $30/user/month annual is the minimum entry point for critical path and baselines. GanttFather is the third option when you want the free open-source depth of GanttProject combined with cloud collaboration — your first project is free, with unlimited viewers and editing that collaborators never pay for, no desktop installation required.

At a glance: feature-by-feature comparison

Sources: pricing — ganttproject.biz/ (open source, confirmed free), microsoft.com/en-us/microsoft-365/project/compare-microsoft-project-management-software (retrieved 2026-04-28).

When GanttProject is the better choice

GanttProject’s most compelling argument is the simplest: it is free, forever, with no strings attached. Licensed under GPL3, it has been maintained as open-source software since 2003. There are no seats to license, no subscription to renew, no trial period, and no feature paywalls — every capability is available to every user from the moment they install it. For academics, non-profits, freelancers, or any team where software budget approval is a barrier, that frictionless access is a real advantage over a tool that starts at $30/user/month for its most useful tier.

The feature set is more complete than many people expect from free desktop software. GanttProject handles Finish-to-Start task dependencies with delay times, runs critical path analysis to identify which tasks drive the project end date, compares the current schedule against saved baselines, and exports directly to MS Project’s .mpp format. A project manager using GanttProject can work in an environment where clients and stakeholders use Microsoft Project without either party needing to reformat anything — the file compatibility is genuine, not approximate.

Resource management is built in too. Assign team members to tasks, view a resource load chart that shows overallocation by week, and calculate project costs. For a sole practitioner or a small team where one person owns the schedule, GanttProject delivers a functional, professional-grade offline Gantt without any procurement process.

Pick GanttProject if: you need a genuinely free Gantt tool with no subscription, you work offline or in an environment without reliable cloud access, you need MS Project file compatibility at zero cost, or your organization cannot justify $30/user/month for a cloud scheduling tool.

When Microsoft Project is the better choice

Microsoft Project is the longest-established project scheduling platform in the enterprise space, and its integration with the Microsoft 365 ecosystem is its primary competitive advantage. Organizations already running Teams, SharePoint, Power BI, and Excel get native data flow between their project schedules and the tools their teams use daily. Plan 3 at $30/user/month connects project timelines to Teams channels, surfaces data in Power BI reports, and stores files in SharePoint — without any custom integration work.

Enterprise resource management is where Microsoft Project has no equivalent among free tools. Plan 3 includes structured resource requests, capacity planning views, and project financials. Plan 5 at $55/user/month adds portfolio-level resource allocation optimization across programs — the kind of coordination capability that manages shared resources across dozens of concurrent projects in large organizations. GanttProject’s resource view is useful for individual project tracking; it is not designed for cross-project resource pooling at scale.

Real-time cloud collaboration is a fundamental capability gap. GanttProject stores project data as local files — sharing means emailing files or syncing through Dropbox/SharePoint manually, with careful version management. Microsoft Project Plan 3 provides cloud-based project scheduling where multiple team members can work simultaneously from any browser or the desktop application, with changes reflected in real time. For teams spread across locations, that gap is decisive.

Microsoft Project also offers perpetual license options — Project Standard 2024 at $679.99 and Project Professional 2024 at $1,129.99 — for organizations that prefer one-time purchases over subscriptions.

Pick Microsoft Project if: your organization is already inside the Microsoft 365 ecosystem, you need real-time cloud collaboration on project schedules, you require enterprise resource management across multiple projects, or your compliance environment requires the Project desktop application with IT-managed licensing.

Pricing reality check

The cost comparison here is unusual because one tool is free and the other is not — but the trade-off is operational capability, not just price.

GanttProject: $0, always. No plan tiers, no user limits, no project caps. The real cost is the operational overhead of file-based collaboration. Every update requires saving and resharing the file. Multiple people cannot edit simultaneously. If one person is the schedule owner and everyone else consumes PDF or PNG exports, GanttProject’s model works fine. If a team of five needs to edit the same schedule in real time, GanttProject cannot deliver that without a separate sync system adding complexity.

Microsoft Project — cost for critical path and baselines:

• Plan 1: $10/user/mo annual — Timeline view only; critical path and baselines NOT included.
• Plan 3: $30/user/mo annual — critical path, baselines, resource management, desktop app.

For a 10-person team: Plan 1 costs $1,200/year but does not include critical path. Plan 3 costs $3,600/year — that is the true entry point for the features GanttProject delivers at $0.

The math is clear: GanttProject is free with full scheduling features; Microsoft Project charges $3,600/year for 10 people to get those same features with added cloud collaboration and enterprise resource management. The question is whether cloud collaboration and Microsoft ecosystem integration justify that gap for your specific team.

Where GanttProject and Microsoft Project both fall short — the modern-Gantt gap

GanttProject and Microsoft Project represent the two extremes of the Gantt spectrum — one is a free offline desktop tool with a two-decade collaboration model unchanged since its founding, the other is an expensive enterprise platform whose value is inseparable from the Microsoft 365 stack around it. GanttProject has no cloud collaboration, no mobile app, and no API — AI agents cannot connect to it without reading local XML files through a custom bridge. Microsoft Project has cloud access but its API requires premium subscriptions and enterprise developer tooling to access. Neither platform offers native AI agent integration that lets a tool like Claude read and manage a live project schedule without building a custom connection. For teams moving toward AI-assisted planning, both platforms require significant integration work to bridge that gap.

The third option: GanttFather

GanttFather is a cloud Gantt tool that gives you your first project free — with 2 editor seats and unlimited free viewers and guests, all four dependency types (FS, SS, FF, SF + lag), critical path, baselines, Kanban view, and Excel round-trip import/export, all at $0. It delivers the feature depth of GanttProject with the real-time cloud collaboration that Microsoft Project charges $30/user/month to unlock. Extra projects you own are $5/month each ($30/year, 50% off) and every feature stays included — pricing grows with the projects you own, never with headcount. Viewers and guests are always free, and editing a project someone else owns costs nothing. The native MCP server means AI agents like Claude can read tasks, update schedules, and manage dependencies directly without custom integrations.

For a direct breakdown against each tool, see:

• How GanttFather compares to GanttProject →
• How GanttFather compares to Microsoft Project →
• See GanttFather pricing

For a broader comparison of free Gantt tools, see Best Free Gantt Chart Tools in 2026, which covers GanttProject alongside eight other free options.

FAQ

Is GanttProject really free?

Yes. GanttProject is free open-source software licensed under GPL3 — no subscription, no trial expiry, no feature paywalls. The optional paid download on the website is a voluntary contribution to support the developers; the software is identical whether you pay or not. It has been continuously maintained since 2003 and runs on Windows, macOS, and Linux. There is a separate cloud service called GanttProject Cloud, which is a commercial paid product — the desktop application described here remains fully free.

Which Microsoft Project plan includes critical path?

Critical path is only available starting from Microsoft Project Plan 3 at $30/user/month (annual billing). Planner Plan 1 at $10/user/month includes Timeline (Gantt) view and basic task dependencies but does not include critical path or baselines. Teams evaluating Plan 1 as a step up from GanttProject should be aware that the core scheduling features they may rely on — critical path and baselines — require Plan 3.

Can GanttProject files be opened in Microsoft Project?

Yes. GanttProject exports to MS Project’s .mpp format, and Microsoft Project can open those files. GanttProject can also import .mpp files from Microsoft Project. This two-way compatibility means GanttProject users can collaborate with stakeholders or clients who use Microsoft Project — sending and receiving .mpp files — without either side needing to convert file formats manually.

Does GanttProject work offline?

Yes, entirely. GanttProject is a desktop application that stores project data as local files and requires no internet connection. This makes it suitable for field environments, air-gapped networks, and locations with unreliable connectivity. The trade-off is that real-time cloud collaboration requires a separate file-sharing system on top of GanttProject.

What does Microsoft Project cost for a 10-person team?

For the tier that includes critical path and baselines (Plan 3): $30 × 10 × 12 = $3,600/year. Planner Plan 1 at $10/user/month ($1,200/year for 10 people) includes Timeline view but not critical path or baselines. One-time license purchases — Project Standard 2024 ($679.99/seat) or Project Professional 2024 ($1,129.99/seat) — are also available for organizations that prefer perpetual licensing over subscriptions.

Is GanttProject good for team collaboration?

GanttProject is designed primarily for individual or single-owner project management. Collaboration is file-based — the project manager saves and shares the file manually, and other users cannot edit the same file simultaneously. This model works well when one person owns the schedule and others consume exports. For teams that need multiple people editing a Gantt chart in real time, GanttProject’s architecture requires workarounds (shared drives, strict file version discipline) that a cloud tool handles automatically.

References:

1. GanttProject. (2026). “GanttProject — Free Desktop Project Scheduling”.
2. Microsoft. (2026). “Compare Microsoft Project Management Software”.
3. GanttProject. (2026). “About GanttProject”.
4. Microsoft. (2026). “Project for the web — Features”.