Is your idea worth building?
About twenty questions on you, the idea and how you would sell it — seven to ten minutes. At the end you get a verdict against the criteria experienced founders use, not encouragement: a score, the three biggest risks, and what to fix first.
What it actually checks
Whether anyone in this niche charges money today. Whether price times frequency adds up to a business. Whether you can ship the first version alone in a month or two. Most ideas die on one of these three, and each is cheaper to check than to build.