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Really nice project. Not sure what's the use case but good fun project. Will use someday. :)

the balsamiq wireframing software is stylized like this, and i think it suits the wireframing context very nicely https://balsamiq.com/

that's just one specific use case, but it's one where i think this sketchy style fits really nicely with the context

Came here to mention Balsamiq. Used it for years and made by rather nice people.

Yep. It was mostly done for fun. I can see it being a tool for wire-framing or interactive mockups.