Diagramium
Diagramium: A capable free Gantt editor for visual planning, presentations, and exports. Ranked #39 of 46 in Gantt Chart Software by our editors (5.5/10); pricing: Free plan; best for free visual plans with critical-path highlighting.
At a glance
- Editor score5.5 / 10
- PricingFree plan
- Best forFree visual plans with critical-path highlighting
- Free planYes
- Paid fromFree
- Task dependenciesYes
- Facts checked20 Sep 2026
Where it wins
- Dependencies, milestones, progress indicators, and critical-path highlighting
- Free guest access with PNG and PDF exports
- Presentation mode plus PNG, PDF, SVG, and animated exports
Where it doesn't
- No resource management or workload views
- No integrations with other platforms
- Charts are stored locally rather than cloud-synced
Our verdict on Diagramium
Diagramium is a browser-based Gantt chart editor for developers, product managers, teachers, analysts, support teams, and other project planners. It covers core schedule visualization with task bars, start dates, durations, dependency arrows, zero-duration milestones, percent-complete indicators, and a Today marker. Daily, weekly, and monthly timeline scales support different planning horizons, while project-day schedules and calendar dates add flexibility for organizing work.
Pricing is straightforward: the Guest plan costs $0 per month and requires no account. It includes all 27 diagram types, PNG and PDF exports, and charts saved in the browser and user files. A free account also costs $0 per month and adds animated GIF, video, and animated SVG exports, along with all themes and Studio features. Subscription plans are not available yet. This makes Diagramium a practical choice for individuals or teams that need visual Gantt planning without a paid tier, especially when presentation and export options matter.
The standout capability is its combination of dependency mapping and critical-path highlighting, supported by progress indicators and multiple timeline scales. Step-by-step presentation with optional narration can turn a schedule into a guided walkthrough. The trade-off is a narrow planning focus: the published feature set does not include resource management, workload views, or integrations. Charts are local-first, stored in the browser rather than cloud-synced, although the editor works offline after loading. Choose Diagramium for free, visual project schedules and exported presentations; choose another tool if shared online workspaces, resource planning, workload analysis, or integrations are central requirements.
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Diagramium pricing
All 3 Diagramium plans and prices →
Diagramium fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Task dependencies | Yes |
| Milestones | Yes |
| Critical path | Yes |
| Baseline tracking | Not verified |
| Resource management | Not verified |
| Workload view | Not verified |
| Deployment | Browser extension |
| Platforms | Web |
| Support | |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan (source) |
| Website | diagramium.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Diagramium
- Oracle Primavera CloudA broad planning suite for capital programs that need scheduling, risk, resources, and portfolios.9.3
- Primavera P6 ProfessionalCPM scheduling and multi-project controls for teams that can work within a Windows desktop setup.9.2
- Autodesk Forma ScheduleConstruction scheduling with Gantt views, version comparisons, and weekly work plans.9.1
See all Diagramium alternatives →
Also Ranked In
Diagramium is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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