Creately is an online visio like diagramming tool with real-time collaboration enabled. There are standalone versions available for Windows/Mac and Linux. Flowcharts, Org charts, Venn diagrams, infographics, etc can be drawn from Creately. Creately offers 1000 of templates to start drawing immediately. It is simply the best diagramming tool available online.
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Pro Professionally designed templates
The templates are well thought-out and actually helps you get started. Not like many other sites where the details are already filled in.
Pro iSO and Android apps to view diagrams
You can't edit diagram using the apps but provides a nice clean interface to view, share and comment on them.
Pro Intuitive UI
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.
Pro SVG import and export
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.
Pro Real time collaboration
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.