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SPECIFICTION
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Diagramium

diagramium.com

Free plan Web
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Spec score 7.7 #28 of 46 in Gantt Chart Software

What it is

Diagramium is a web-based Gantt chart maker for creating project schedules and presenting them step by step. Charts can include tasks, dependencies, milestones, progress, a highlighted critical path, and a Today marker. Timelines use calendar dates or project days with Daily, Weekly, or Monthly scales. Present mode reveals tasks sequentially and can add AI voice narration, subtitles, and speaker notes for each step. After loading, the browser editor works offline. Charts remain in browser storage and exported files; the privacy policy says content is not uploaded, no cookies are set, and no third-party analytics are used. PNG, SVG, and PDF exports do not require an account. Animated GIF, video, and animated SVG exports require a free Google sign-in account. Clearing site data can permanently delete unexported local charts.

Spec sheet

Purpose
The Gantt chart maker creates project schedules with tasks, dependencies, milestones, progress, a critical-path highlight, and a Today marker.Read 8 Oct 2026 · diagramium.com
Intended users
The About page names developers, product managers, teachers, analysts, and support teams among its intended users.Read 8 Oct 2026 · diagramium.com
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.Read 8 Oct 2026 · diagramium.com
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.Read 8 Oct 2026 · diagramium.com
Support
The About page directs questions and feedback to a sign-in-required contact form or [email protected].Read 8 Oct 2026 · diagramium.com
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.Read 8 Oct 2026 · diagramium.com
Age requirement
Anyone may use the service without an account; creating an account requires age 13 or the higher minimum where the user lives.Read 8 Oct 2026 · diagramium.com
Data storage
Charts are stored in browser storage, and clearing site data can permanently delete locally stored diagrams that have not been exported.Read 8 Oct 2026 · diagramium.com
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.Read 8 Oct 2026 · diagramium.com
Offline use
The browser editor works offline after it has loaded, and the maker says charts stay on the device and in exported files.Read 8 Oct 2026 · diagramium.com
Presentations
Present mode reveals tasks step by step and supports optional AI voice narration, subtitles, and per-step speaker notes.Read 8 Oct 2026 · diagramium.com
Scheduling
Charts can use calendar dates or project days, with Daily, Weekly, and Monthly time-axis scales.Read 8 Oct 2026 · diagramium.com

Plans and prices

Free account Free Sign in with Google; no payment Animated exports (GIF, video, animated SVG) require a free account Read 8 Oct 2026 · diagramium.com
Guest Free No account needed Build and present charts · PNG or PDF export without an account Read 8 Oct 2026 · diagramium.com

Every Diagramium plan and price →

Strong points and limits

Strong points

  • Tasks, dependencies, milestones, and progress
  • Critical-path and Today markers
  • Offline editing after loading
  • PNG, SVG, and PDF exports without account
  • Step-by-step presentation mode

Limits

  • Clearing site data can erase local charts
  • Animated exports require free account
  • Web platform only
  • Charts stored in browser storage

Who it suits

It suits developers, product managers, teachers, analysts, and support teams planning or presenting schedules. It is useful for people who want local, browser-based chart editing and presentation.

Verdict

Diagramium combines scheduling, presentation, and local browser storage in a free web tool. Export static formats without signing in, but preserve important charts before clearing site data and create an account for animated exports.

Where Specifiction places it

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