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Does the comment above give you any insight of how they differ? That would be useful, but it's not the case

Yes it does. I often use draw.io. I've heard of graphviz but never looked into it. I found the original comment very useful because now I know:

- draw.io and graphviz have similar use cases (otherwise it wouldn't have been mentioned)

- Both have VS code plugins

- graphviz is a more structured language

- graphviz is more mature

- graphviz can be used from command line

Theoretically, drawio can be used from command line too! (it involves puppeteer though)