Diagramium
Diagramium is a web-based Gantt chart maker for creating project schedules and presenting them step by step.
What Diagramium is
Diagramium is a web-based Gantt chart maker for creating project schedules and presenting them step by step. Charts can show tasks, dependencies, milestones, progress, a highlighted critical path, and a Today marker. Schedules can use calendar dates or project days, with daily, weekly, or monthly time scales. Present mode reveals tasks in sequence and can include optional AI voice narration, subtitles, and speaker notes for each step. The browser editor works offline after it has loaded. Charts are stored in browser storage, and Diagramium says chart content is not uploaded; its privacy policy also says the app sets no cookies and uses no third-party analytics. PNG, SVG, and PDF exports are available without an account. Animated GIF, video, and animated SVG exports require a free Google sign-in account. Because charts are stored locally, clearing site data can permanently delete diagrams that have not been exported. The service is free, and anyone may use it without an account; creating an account requires age 13 or the higher minimum where the user lives.
Good
- Charts include dependencies, milestones, and progress
- Daily, weekly, and monthly time scales
- Works offline after the editor loads
- PNG, SVG, and PDF exports need no account
- Presentations can include notes and narration
Watch out
- Clearing site data can permanently delete unexported charts
- Animated exports require a free Google sign-in
- Offline use starts only after the editor loads
Who it suits
Diagramium suits developers, product managers, teachers, analysts, and support teams who need to build and present project schedules. It may also fit users who want local browser storage and account-free exports for static files.
Verdict
Diagramium offers scheduling, presentation, and export tools in a free browser editor. Export important charts before clearing site data, and note that animated export formats require a free account.
Plans and prices
From Diagramium's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free account | Free | Animated exports (GIF, video, animated SVG) require a free account · Sign in with Google; no payment |
| Guest | Free | Build and present charts · PNG or PDF export without an account · No account needed |
The facts
Each one read from Diagramium's own pages, with the date it was checked.
What it does
- 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.checked 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.checked 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.checked 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.checked 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.checked 8 Oct 2026
- Intended users
- The About page names developers, product managers, teachers, analysts, and support teams among its intended users.checked 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.checked 8 Oct 2026
- Presentations
- Present mode reveals tasks step by step and supports optional AI voice narration, subtitles, and per-step speaker notes.checked 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.checked 8 Oct 2026
- Purpose
- The Gantt chart maker creates project schedules with tasks, dependencies, milestones, progress, a critical-path highlight, and a Today marker.checked 8 Oct 2026
- Scheduling
- Charts can use calendar dates or project days, with Daily, Weekly, and Monthly time-axis scales.checked 8 Oct 2026
- Support
- The About page directs questions and feedback to a sign-in-required contact form or [email protected].checked 8 Oct 2026
