Combined downloads for my Scrabble game solver (take a picture of the scrabble board, take a picture of your rack of tiles, play the optimal word) and my jigsaw puzzle solver (finding a needle in a haystack) totalled up to less than the fingers on the hands of a bad Youtube woodworker practicing every unsafe operation with a table saw whilst being inanttentive. After two years, back in 2013-ish, I removed the apps from the app store.
Sorry those didn’t pan out! I’m not sure I would actually pay for such an app since I only do jigsaw puzzles every few years. But it is fun to know it has been done and could be done again.