Diagrams look great - well done.
Reminds me of a similar project years ago that was doing the same thing - they ultimately struggled with monetization and folded (I forget the name) -- however this one is MIT OSS, so I'm guessing that's not a key concern right now.
Note that your "Built with the Isoflow library" link at the bottom to isoflow 404's to https://github.com/isoflow/isoflow
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