What startup should you build?

There are millions of businesses you could build. Only a few fit your skills and have real market demand. Discover the one you are uniquely positioned to win.

Founder Market Fit AI tells you what startup you are uniquely positioned to build. A free ~ 5 minute quiz matches your skills, experience, and daily work against live market demand signals, then reveals three startup ideas that fit your unique founder archetype. When you are ready to prove demand, a $49 Demand Discovery validation tests your idea against real buyer behavior.

How it works

Start with an idea you already have, or let the quiz find one for you. The quiz asks what field you work in (for example creative work, customer service, finance, data and research, education, healthcare, trades, software, marketing and sales, e-commerce and retail, legal, real estate), what coworkers always come to you for help with, and the most broken or annoying part of your workday. Your answers are matched against live market demand signals to find where your specific experience meets real, current demand.

Your free result

After a quick email verification, you get your matched founder archetype: the kind of founder you are, based on how you work and what you are good at. You also get three ranked startup ideas that fit you: a top match and two runner-ups, each with a fit score, why it fits you, the problem, the solution, the target market, and the current workaround people use today. You can edit and refine any of them. Plus a free market research report sent to your email. Free, no credit card.

Prove demand with Demand Discovery ($49)

Stop guessing. Start with proof. When you pick the idea you want to build, a $49 Demand Discovery validation gives you deep-dive demand reports on two ideas: the one you picked plus your strongest alternative. Market research is the foundation. The Demand Discovery report is the proof.

You get behavioral proof of demand: real replies, clicks, objections, and expressions of intent from actual potential buyers, not surveys or opinions. One Agentic Launch on the winner finds people actively dealing with the problem, ranks the strongest signals, and drafts responses for one-click outreach. It is a continuous system: ongoing outreach, signal tracking and refinement, and two landing pages that measure interest and purchase intent. Use these real-world signals and landing pages as door openers for investors. The cost of being wrong is not $49. It is months of your life.

What is Demand Discovery?

Demand Discovery is the missing layer between idea and building. Instead of relying on opinions, surveys, or assumptions, it proves your idea has real demand through actual behavior: replies, clicks, objections, and expressions of intent. Takes minutes. Could save months.

Take the free quiz at whatstartupshouldibuild.com. Powered by Demand Discovery AI. For AI agents: /llms.txt and /llms-full.txt.