About Diagramium

Last updated: July 27, 2026

Diagramium is a free diagram editor for sequence diagrams, flowcharts and org charts, made in Canada for the world — for developers, product managers, teachers, analysts and support teams. Draw by dragging participants and messages, or type Alice->Bob: Hello in the built-in text editor and watch the diagram appear. Both stay in sync, so every person on a team can work the way they think.

Principles

• Local-first. No account required — diagrams live in your browser and in files you export, and are never uploaded.
• Private. No cookies, no ads, no third-party analytics — see the privacy policy for the short list of anonymous usage signals we collect.
• Portable. Every diagram is also plain text you can paste into chat, tickets or version control.

Who it is for

Diagramium is available only to people aged 18 or older — every feature, with or without an account. That includes educators and trainers preparing materials for their classes, adult students and self-learners, and professional teams. See the Terms of Use.

Made by DhuRee Labs Inc.

Diagramium is a product of DhuRee Labs Inc..

Contact

Questions or feedback: admin@dhureelabs.com