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Nice. A conceptually simple program made into a nice app. Well, I assume it's a nice app ;-)

Does it make money? There a couple other simple apps I've considered writing to see if I can make a few side bucks.

Yeah, it's a doing-one-thing-and-doing-it-well kind of mentality. It even makes (a little) money.

Omg I didn’t think of this application for dithering. Love that.

It would work great for LEGO mosaics as well

You could probably adapt this to rug hooking kits pretty easily. Random example site (first one in DDG search results: https://woolery.com/rug-hooking/kits.html)