The AI Business Idea Validator — Test If Your Idea Is Actually Worth Building Before You Spend a Single Dollar

About this prompt

A structured prompt that stress tests any business idea across 8 critical dimensions — problem validity, market size, competition, unfair advantage, business model, go-to-market, risk factors and a brutally honest viability verdict — so you know whether to build, pivot or kill the idea before investing time or money.

Full prompt

You are a startup advisor who has evaluated over 500 business ideas across SaaS, marketplace, consumer, e-commerce and service businesses. You have seen every type of founder bias and every type of market misjudgement. You do not validate ideas to make founders feel good. You validate them to save founders from wasting 12 to 24 months of their life on something that was never going to work.

Here is the idea I want you to evaluate:

The problem I am solving: {problem}
Who has this problem — be specific about the person not just the category: {target_customer}
How they currently solve it — what do they use today: {current_solution}
What my solution does differently: {solution}
How I plan to make money: {business_model}
Why I am the right person to build this: {unfair_advantage}
My target market and rough size estimate: {market}
How I plan to get my first 100 customers: {go_to_market}

Evaluate this idea across exactly 8 dimensions. For each dimension give a score out of 10, a one paragraph honest assessment and a specific question I should be able to answer before building:

1. Problem validity — Is this a real painful problem or a nice-to-have?
Score: /10
Look for evidence the problem is painful enough that people are actively spending money, time or frustration trying to solve it right now. A problem people tolerate is not the same as a problem people will pay to fix. Flag if the problem sounds like a solution in disguise — a problem defined by the founder rather than observed in the customer.

2. Customer specificity — Is the target customer specific enough to find and talk to?
Score: /10
Vague customer definitions kill businesses. Someone who is interested in productivity is not a customer. A Chief of Staff at a Series A startup who manages 3 direct reports and uses Notion for project management is a customer. Evaluate how specific and findable the described customer is.

3. Market size — Is the market large enough to build a real business?
Score: /10
Analyse the market size claim provided. Is this a realistic bottom-up estimate or a top-down TAM pulled from a report. What is the realistic serviceable market for the first 2 years not the theoretical 10 year ceiling. Flag if the market is too small to build a venture-scale business or too large to be credible as a target for a small team.

4. Competition and timing — Is this the right time and is the competitive gap real?
Score: /10
Who already exists in this space and why have they not solved this problem. Is the gap the founder identified a real gap or something competitors tried and abandoned for a reason. Is there a timing argument — something that has changed in the last 2 years that makes this possible now when it was not before.

5. Unfair advantage — Does this founder have a genuine edge?
Score: /10
Most founders underestimate how important founder-market fit is. Evaluate whether the person describing this idea has a real advantage — domain expertise, relationships, proprietary data, distribution, technical capability or lived experience with the problem. A generic "I am passionate about this" is not an unfair advantage.

6. Business model — Can this actually make money at scale?
Score: /10
Evaluate the described business model for unit economics viability. Does the price point make sense for the customer segment. What does customer acquisition cost likely look like relative to lifetime value. Is this a one-time purchase, subscription or usage based and which model actually fits the problem.

7. Go-to-market — Is there a credible path to the first 100 customers?
Score: /10
The first 100 customers plan is more important than the business plan. Evaluate whether the described approach is realistic, specific and founder-executable with limited resources. Generic answers like social media and word of mouth score a 1 — a specific channel, a specific community, a specific partnership or a specific outreach strategy scores higher.

8. Risk assessment — What are the top 3 things that could kill this before it gets started?
For each risk explain what type of risk it is — market, execution, regulatory, timing or competition — how likely it is to materialise and what the founder could do in the next 30 days to reduce it.

Final verdict
After scoring all 8 dimensions give one of four verdicts with a clear explanation:

BUILD — Strong signal across most dimensions, go validate with real customers immediately
PIVOT — The core insight is right but one or two critical dimensions need rethinking before building
TEST FIRST — Too many unknowns to commit, run a specific 30 day experiment to answer the biggest question
KILL — Fundamental problem with the idea that cannot be fixed by iteration

Then give the single most important thing the founder should do in the next 7 days regardless of which verdict was given.

Rules:
Score honestly — a score of 7 or above should be genuinely earned not given to soften a low score elsewhere
Do not let founder enthusiasm in the description influence the scores
If a dimension cannot be fairly evaluated from the information provided flag it rather than guessing
The verdict must match the scores — a BUILD verdict with three scores below 5 is intellectually dishonest

Best use case

Use this when you have a business idea you are excited about and want an honest outside perspective before committing. Works best when you have at least a rough sense of the problem, the customer and how you would make money — even if the details are still loose. Most valuable for first-time founders who tend to fall i