After I published a post about SDEdit which is a free desktop sequence diagram editor, I received a mail from Steve Hanov who wanted to introduce me with a very impressive alternative to SDEdit. Steve has created a web service that creates renditions of sequence diagrams, it is completely online and does not require a download. Well, after reviewing this tool, I decided to let Dev102 readers know about it too, it is really great.

Like SDEdit, the UML sequence diagrams are created from a textual syntax and not by drawing objects and lines. Lets take a look at the following example:

Alice->Bob: Authentication Request
note right of Bob: Bob thinks about it.
Bob-->Alice: Authentication Response

You can notice that the syntax is easy and if you ask from the tool to draw it, this is what you get: