SequenceDiagram.org is a completely free online tool for creating sequence diagrams. The graphic design is created by yusi.se.
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 diagram where other similar tools struggle. It also doesn't have any ads or unnecessary distracting elements. (Even the top bar can be hidden to maximize the working area)
The source script of the diagrams can be save as text files directly to your hard drive. There are also single click buttons to save the diagram in HQ png or LQ jpeg format. The size of the image depends on the current zoom level.
If you want to share a diagram with others there is a URL share button available. It creates a link containing all the data of the diagram and can be sent to others so that they can view your diagram or keep working where you left off.
The tool is developed and maintained 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 email@example.com
Are diagrams stored in any way or sent to any server by SequenceDiagram.org?
If you use the share URL button and someone clicks on your link, the data in the URL will be visible in the http access logs. Otherwise no, since all parsing and drawing of diagrams is executed solely on the client side in your browser.
Are diagrams/scripts created using SequenceDiagram.org covered by any license?
No license is imposed by SequenceDiagram.org itself. However, like with all images containing text, the font you chose to use might, depending on how you plan to use the image. 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.
Is the code base of SequenceDiagram.org itself open source?
The code base is currently not available under any open source license. This is unlikely to be prioritized while there are still local developers who enjoy working on it :)
What libraries are used by SequenceDiagram.org?