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Current Version: 8.2.1 release notes
Legacy: 7.6.1, 6.5.1, 5.0.2, 4.7.1
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SequenceDiagram.org is an online tool / software for creating uml sequence diagrams.

All processing of parsing and painting the diagram is done client side in the user's web browser. This not only makes it snappy to work with, but it also means that your data isn't transferred over the Internet by the tool like in many other sequence diagram tools. Since no backend server is used it is also possible to use the tool offline.

There are many sequence diagram tools out there but this is the only one which allows you to:

In other words bringing the best from both worlds. This makes it very easy to work with large diagrams where other similar tools struggle. It also doesn't have any ads or unnecessary distracting elements.

The tool is developed, maintained, and used by people who create a lot of sequence diagrams in their daily work and from efficiency point of view weren't 100% satisfied with the existing tools.

If you have any question/comments/suggestions/bugs please contact info@sequencediagram.org. The more feedback we get the better we can prioritize.


Privacy and data protection information

The tool itself does not collect data, however services it relies on such as Content Delivery Network, hosting, and cloud storage does. See privacy policy for details.

Are diagrams/scripts created using SequenceDiagram.org subject to any license?

No license is imposed by SequenceDiagram.org on the generated output. However, like with all images containing text, the fonts used might. The default font used in diagrams is the default sans-serif font selected by your browser. You can specify a different font using the fontfamily keyword, see help for more information. See LICENSE for details.

How do I generate a PDF of my sequence diagram?

Zoom to a chosen level in the editor and Print to PDF from your browser. The print css makes sure to only shows the diagram on the page.

Are there any example sequence diagrams?

Yes, clicking the instruction button show examples of all possible diagram elements. Clicking on the displayed examples appends them to the active sequence diagram.

Is the codebase of SequenceDiagram.org open source?

The codebase is currently not available under any open source license

Can I run the SequenceDiagram.org tool in my company's private network (on-premises)?

Yes, by donating 400$ you are licensed to run the SequenceDiagram.org tool and its REST-like API inside your company's network (enterprise license). You are also eligible to receive any new published versions of the software for the duration of 1 year from the donation date by request. Your donation is highly appreciated and allows us to keep SequenceDiagram.org online and free for everyone to use. Please contact info@sequencediagram.org for any questions.

The software is delivered in three formats:

What libraries are used by SequenceDiagram.org?

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