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SequenceIT is an app for creating and viewing Sequence Diagrams.
You can quickly create and share these UML 2 based diagrams through email, images, or the file itself.
Latest features include directly draw messages and lifelines using various actions (swipe, tap, double tap) to very quickly create sequence diagrams.
There is also a WYSIWYG editor to help create diagrams if you prefer.
Or you can just create the text on an Editor or email yourself the file which can be opened into SequenceIT.
The Editor allows you to tweak and enhance further and in edit mode move messages around making it very easy to change.
Though it is already rich on functionality there will be many enhancements to follow.