I think it was actually just a straight mobile clone as I see "WigglyPaint" in the screenshots and the original Android app was called WigglyPaint as well based on the url (/apps/details?id=io.wigglypaint.android). Probably got more popular than they were expecting and decided to pivot a bit.
Another option is https://roda.jeremyevans.net/, which I've found is the sweet spot in smaller projects, but can still scale up. The plugin system works really well to extend and the routing tree is really easy to work with.
Very rare in the PNW (or at least Washington) and Alaska. Thankful for that as the chances of a fire starting from them seems high. Last summer we only had one lighting "storm" which had a total two lighting strikes and one of them started a fire.
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