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Diagramium
What it is
Diagramium is a web Gantt chart maker for scheduling and presenting projects. Charts can include tasks, dependencies, milestones, progress indicators, a highlighted critical path, and a marker for the current day. Timelines may use calendar dates or project days, with daily, weekly, or monthly scales. Present mode reveals work items in sequence and can add optional AI voice narration, subtitles, and speaker notes for each step. After loading, the browser editor works offline. Diagramium says chart content stays on the device and in exported files; its policy says content is not uploaded, no cookies are set, and no third-party analytics are used. PNG, SVG, and PDF exports are available without an account. Animated GIF, video, and animated SVG exports require a free Google sign-in account. Charts are stored in browser storage, so clearing site data can permanently remove diagrams that were not exported. The service names developers, product managers, teachers, analysts, and support teams as intended users. Guest and free-account plans cost nothing.
For and against
For
- Free guest plan
- Supports dependencies and milestones
- Critical-path highlighting
- Offline editing after loading
- PNG, SVG, and PDF exports without account
Against
- Animated exports require free account
- Clearing site data can erase local charts
- Web platform only
The verdict
Diagramium offers a free, browser-based Gantt workflow with presentation tools and several account-free export formats. Local storage supports offline work but makes unexported charts vulnerable to cleared site data.
Who it suits
It suits people who need browser-based project schedules with dependencies, milestones, and critical-path views. Presenters and teams wanting offline editing or account-free standard exports may also benefit.
Plans and prices
Free account
Animated exports (GIF, video, animated SVG) require a free account
Read 8 Oct 2026 · diagramium.com
Guest
Build and present charts · PNG or PDF export without an account
Read 8 Oct 2026 · diagramium.com
On the record
- Account and sign-in
- Creating an account is optional and uses Google sign-in through Supabase; the policy says Diagramium does not see or store a Diagramium password.diagramium.com · read 8 Oct 2026
- Age requirement
- Anyone may use the service without an account; creating an account requires age 13 or the higher minimum where the user lives.diagramium.com · read 8 Oct 2026
- Data storage
- Charts are stored in browser storage, and clearing site data can permanently delete locally stored diagrams that have not been exported.diagramium.com · read 8 Oct 2026
- Exports
- PNG and SVG exports are available without an account; PDF is also listed in the FAQ as an account-free export, while animated GIF, video, and animated SVG require a free account.diagramium.com · read 8 Oct 2026
- Integrations
- The privacy policy identifies Google sign-in as an optional independent service and says the app itself talks only to Diagramium's website and its database provider.diagramium.com · read 8 Oct 2026
- Intended users
- The About page names developers, product managers, teachers, analysts, and support teams among its intended users.diagramium.com · read 8 Oct 2026
- Offline use
- The browser editor works offline after it has loaded, and the maker says charts stay on the device and in exported files.diagramium.com · read 8 Oct 2026
- Presentations
- Present mode reveals tasks step by step and supports optional AI voice narration, subtitles, and per-step speaker notes.diagramium.com · read 8 Oct 2026
- Privacy
- The privacy policy says diagram content is not uploaded, the app sets no cookies, and it uses no third-party analytics; it also describes anonymous gallery engagement counts and export-format totals.diagramium.com · read 8 Oct 2026
- Purpose
- The Gantt chart maker creates project schedules with tasks, dependencies, milestones, progress, a critical-path highlight, and a Today marker.diagramium.com · read 8 Oct 2026
- Scheduling
- Charts can use calendar dates or project days, with Daily, Weekly, and Monthly time-axis scales.diagramium.com · read 8 Oct 2026
- Support
- The About page directs questions and feedback to a sign-in-required contact form or [email protected].diagramium.com · read 8 Oct 2026
