LucidChart is a general-purpose diagram tool. I use this myself. You can draw diagrams of anything you want. For example, I can draw a network diagram of a proposed change. The Meraki Dashboard topology tool shows the network as it is "right now". You can't add extra notes, information, or non-network related information (perhaps you want to document a data flow, network access requirements, etc). This is like comparing Microsoft Word to a screenshot.
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