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I also had a few outright failures: presetbot.com (api for lightroom presets) - cool idea, but no real demand altnado.com (automatic alt text) - struggled to find initial users, probably isn't a big enough pain point unless you're a super large enterprise, which would likely require work per client

Too high quantity for sure. I try to talk to potential users in advance, look at search volumes on Google, and competitors. Elmo for example was more like a demo than an MVP, but some others are more full featured.