Axure vs Creately

Allows creation of interactive HTML mock-ups which is accessible for both websites and mobile applications.

Great web options, but you can also save your wire frames out to Word and convert the notes to annotations.

You can create a component (widget) that you can use over and over again.

Available for use on Windows and Mac.

You can set up a project with SVN-like check-in/out system to work with others.

There is a wealth of online training including videos for getting the basics down, a great community to mine, and support team to help assist with more technical details.

The templates are well thought-out and actually helps you get started. Not like many other sites where the details are already filled in.

Consist with an example diagram which we can use to draw the diagram.
Most required diagrams are available.

Does not require flash.

Easy to use drag and drop interface and a contextual toolbar that shows you all the important actions when you select an object. The automatic creation and connecting of next object alone saves tons of time.

You can invite anyone by their email addresses to collaborate with your diagram. You can see others' changes to the diagram real time with the Creately Online and Desktop app.

You can't edit diagram using the apps but provides a nice clean interface to view, share and comment on them.

Creately supports SVG (Scalar Vector Graphics) import and export to make your diagrams more attractive. It allows you to re-size your diagram as much as you want without getting it messed up.