SequenceDiagram.org is an online tool / software for creating UML sequence diagrams. Founded in 2014 with the purpose to improve the efficiency when creating and working with sequence diagrams by combining text notation scripting and drawing by clicking and dragging in the same model.
All parsing, processing, and drawing is done client side. The benefit of this is that SequenceDiagram.org is fast and convenient to work with; it also doesn't transfer your diagram data over the Internet like many other sequence diagram tools on the market. This also means that it is possible to work with the tool offline.
The tool is developed, maintained, and used by people who create a lot of sequence diagrams in their daily work. If you have any question / comments / suggestions / bugs please raise a request in our Help Center or send email to info@sequencediagram.org. The more feedback we get the better we can prioritize.
FAQ
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, do. 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.
On which platforms is SequenceDiagram.org available?
See menu "Help" -> "Platforms & API"
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 show the diagram on the page.
Are there any example sequence diagrams?
Yes, clicking the help menu and selecting "Instructions" will show examples of all possible diagram elements. A copy icon is
available for copying the source text.
You can also ask ChatGPT to "Create a detailed sequence diagram for TLS 1.3 handshake using textual sequencediagram.org syntax"
Is the codebase of SequenceDiagram.org open source?
No, the codebase is currently not available under any open source license
What libraries are used by SequenceDiagram.org?
- lz-string is used to create URLs for sharing sequence diagrams. LICENSE
- Canvas2Svg is used to export the diagram into SVG file format. LICENSE
- CodeMirror is used as the text editor. LICENSE
- Font Awesome is used to provide icons for the icon participants. LICENSE
- Material Design Icons is used to provide icons for the icon participants. Color of the icons is altered based on input. LICENSE
- Font Awesome 5 Free is used to provide icons for the icon participants. LICENSE
- Font Awesome 6 Free is used to provide icons for the icon participants. Color of the icons is altered based on input. LICENSE
- RBush is used for collision detection calculations for onmousemove events. LICENSE
- DomPurify is used as a safeguard when embedding SVG files from Font Awesome and Material Design Icons. LICENSE
- MSAL.js from Microsoft is used for authentication towards Microsoft services.
- OneDrive.js from Microsoft is used for file picker for OneDrive and SharePoint.
- gsi/client and api.js from Google is used for authentication towards Google services and file picker for Google Drive and Team Drives.
SequenceDiagram.org and its services are provided by NoSpareTime AB, a private limited company.