Build Check is a free AI app idea validation quiz that scores early-stage app, SaaS, and workflow ideas across six dimensions in about two minutes.
The tool asks you 12 questions and returns a scorecard with a grade and a dimension-by-dimension breakdown.
Build Check is ideal for outsiders, domain experts, indie builders, and nontechnical founders who see a real problem in their field and want a fast reality check before they spend serious time on a build.
It works best at the first filtering stage for niche products, internal tools, side projects, and small SaaS ideas.
Features
- Scores app ideas across six dimensions: Real Problem, Frequency and Pain, Who It’s For, Builder Fit, Signs of Demand, and Your Drive.
- Returns a letter grade from A to F based on a 60-point total, with 42 or more points considered a strong signal to continue.
- Generates a shareable scorecard for posting to X or LinkedIn.
- Includes a copyable prompt that runs the same six-dimensional framework inside Claude, ChatGPT, or Gemini.
Use Cases
- Validate a new SaaS idea before writing specs or touching code.
- Pressure test an internal workflow tool idea that comes from domain pain inside a specific job or industry.
- Compare several side project ideas and pick the strongest one first.
- Turn a vague product hunch into a concrete next step with the suggested 48 Hour Experiment.
How To Use It
1. Open Build Check and type a description of your app idea in the opening text field. The more specific the description, the more accurate the AI scoring. For example:
A [tool type] for [specific user] to [specific action] [in a specific context]." Generic descriptions like "a productivity app.
2. Add supporting context (optional). This field accepts any market research, competitor notes, user feedback, or data you already have.
3. Answer all 12 questions for one exact use case. The quiz covers all six scoring dimensions. Each question presents four answer options with different point weights. For example:
| # | Dimension | What It Measures |
|---|---|---|
| Q1 | Real Problem | Severity of the problem being solved |
| Q2 | Real Problem | Stickiness test: what users would do if the app disappeared |
| Q3 | Frequency and Pain | How often the problem occurs |
| Q4 | Frequency and Pain | How much the problem costs in time or money |
| Q5 | Who It’s For | Specificity of the target audience |
| Q6 | Who It’s For | Accessibility of early test users |
| Q7 | Builder Fit | Personal experience with the problem |
| Q8 | Builder Fit | Domain credibility or genuine obsession |
| Q9 | Signs of Demand | Existing tools, workarounds, or competitors |
| Q10 | Signs of Demand | Predicted response if the idea were posted online |
| Q11 | Your Drive | Motivation to build even without financial return |
| Q12 | Your Drive | Commitment to sustaining work over several months |
4. Click “Show me the verdict” after completing all 12 questions.
5. Choose the email step based on how you want to keep the result. Enter an address if you want the full scorecard in your inbox with weekly tips, or click No Thanks if you want the on-screen verdict right away.
6. The following prompt is the exact framework used by Build Check. You can paste it into any major AI assistant (ChatGPT, Claude, or Gemini) to run the validation manually.
You are an app idea validator. I'll tell you my idea, then you score it across 6 dimensions — ask me 2 targeted questions per dimension before scoring each one out of 10.
Dimensions:
1. Real Problem — Is this a hair-on-fire problem or a "nice to have"?
2. Frequency & Pain — How often does it happen and how bad is it?
3. Target Audience — Can I describe a specific, reachable person with this problem?
4. Builder Fit — Do I have domain knowledge, network, or genuine obsession with this space?
5. Demand Signals — Are there competitors, workarounds, or communities proving demand exists?
6. My Drive — Will I still care about this in 6 months?
After all 6 dimensions:
- Total score out of 60 + grade: A (50-60), B (40-49), C (30-39), D (20-29), F (<20)
- 2-sentence verdict on the idea
- 3 specific things to do THIS WEEK based on my weakest dimensions
- One 48-hour validation experiment to run before writing a single line of code
Start by asking me to describe my idea in one sentence.
Pros
- 100% free and no sign-up to get results.
- Takes less than two minutes to complete.
- Provides a repeatable, objective checklist for any idea.
Cons
- Cannot replace real customer interviews or market research.
- Only handles early idea validation.
FAQs
Q: How does the scoring work?
A: The quiz scores ideas across six dimensions: Real Problem, Frequency and Pain, Who It’s For, Builder Fit, Signs of Demand, and Your Drive. Each dimension is worth up to 10 points for a maximum total of 60. A score of 42 or above is the benchmark for a strong signal to continue pursuing the idea.
Q: Does a low score mean the idea is bad?
A: No. A low score typically means either the problem or audience description is not specific enough, or that market demand signals are currently weak. The AI-generated next steps at the bottom of the results page address the weakest-scoring dimensions directly and are the recommended starting point for refining the idea before making a final call.
Q: Does a high score mean I should start building immediately?
A: A high score signals strong fundamentals, not a green light to start coding. The results page includes a 48-hour validation experiment, which is a fast, low-cost action designed to test the core assumption before committing significant time.
Q: What is vibe coding?
A: Vibe coding refers to building software by describing what you want in plain language to an AI tool like Claude, ChatGPT, Cursor, or Bolt.
Q: Can Build Check replace market research?
A: No. Build Check acts as a filter. It can point at the weak assumption fast, yet real user conversations and demand checks still matter before a serious build starts.
