The Startup Idea Validation Checklist
Eight questions. Most founders skip at least three. The ones they skip are usually the ones that kill the idea nine months later.
TL;DR
- 01.Validation is not about proving your idea is good. It is about finding the flaw before you build.
- 02.Eight questions cover the four areas that kill most ideas: customer, market, feasibility, and economics.
- 03.If you cannot answer a question, that is the signal — not a reason to skip it.
- 04.Run this checklist before you write a line of code, not after you have already committed.
The verdict
“A checklist does not validate your idea. It tells you which part you have not thought through yet.”
Why most validation advice fails
Most startup validation frameworks tell you to talk to customers, build an MVP, or run a landing page test. That is not wrong. But it skips the step before all of those: figuring out which questions you actually need to answer first.
The checklist below is not about confirming that your idea is good. It is about finding the specific assumption that is most likely to be wrong — so you know where to look before you invest months finding out the hard way.
Founders who skip validation do not think they are skipping it. They think talking to three friends counts. It does not.
The eight questions
Work through these in order. If you get stuck on one, stop. That is where your validation effort should go — not into building.
Can you describe the exact person who has this problem right now?
Not "small business owners." Not "busy professionals." Name the job title, the company size, the specific situation. If your answer is still broad, your target is not real yet.
Are they already spending money to solve it — even badly?
Workarounds count. Spreadsheets, manual processes, hiring someone, buying a tool that half-solves it. If they are not spending anything, the problem may not be painful enough to pay for.
Can you reach ten of them this week without a budget?
LinkedIn, Reddit, Slack communities, Twitter/X, cold email. If you cannot find ten people with this problem in a week, you will not be able to find ten thousand customers later.
Is the market moving toward this problem or away from it?
Timing kills more ideas than competition does. Find evidence — job postings, Google Trends, funding rounds, regulatory changes. A growing problem is easier to sell into than a shrinking one.
What is the one thing that could make this impossible to build?
Legal barriers. Data access. A patent. A platform dependency. A cost structure that never works at scale. Every idea has a potential killer. Find yours now, not after six months of building.
Who already solves this, and why will someone switch?
A competitor is proof the problem exists. But switching costs are real. You need a specific reason someone leaves what they have today — not just "it's better," but better at the thing they actually care about.
Do the unit economics work at 1,000 customers?
Price × volume − cost to acquire − cost to serve. Run the numbers. If the margin disappears at scale, or the price required makes no sense for the market, the model is broken before you start.
Why now? What changed in the last two years that makes this viable today?
New technology, a regulatory shift, a behavioural change, a market event. If the answer is "nothing really changed," ask why nobody built this five years ago — and why that reason no longer applies.
How to use this checklist
Go through it twice. First pass: answer each question off the top of your head. Second pass: find evidence for each answer — a real conversation, a data point, a competitor pricing page, a job posting, a Reddit thread where someone complains about this exact problem.
Any answer that is still just your opinion after the second pass is an assumption. Assumptions are not validation. They are questions you have not answered yet.
The goal is not to get eight green checkmarks. It is to find the one red flag early enough to do something about it.
What to do with a failed answer
If you cannot answer question 2 — nobody is currently spending money to solve this — you have two options. One: find evidence you missed. Talk to more people. Look harder. Two: accept that willingness to pay is unproven and treat that as your highest-priority risk before building anything.
Most founders choose a third option: skip the question and tell themselves they will figure it out later. That is how you end up six months in with a product that solves a problem nobody will pay for.
The questions you cannot answer are not inconvenient. They are the most important information you have about your idea right now.
For a deeper look at the specific failure modes this checklist is designed to catch, read our post on how to find your startup idea's fatal flaw before you build.
And if you have already found a competitor while working through question 6, see what to do when your startup idea already exists.
Find your fatal flaw now
Your idea has a fatal flaw. Find it before you build.
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