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Stress-test a business idea before you quit your job

You've got an idea and a gut feeling it could work. Get it tested with the questions a hard-nosed friend would ask, the numbers that must add up and three cheap ways to test it this month.

Updated 17 Oct 2026

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The prompt · ChatGPT

Stress-test my business idea.

The idea: [what you'll sell]
Who'd buy it: [customer]
Why I think it'll work: [reasons]
Price and costs, roughly: [figures]
Competition: [who else does it]
What I'd risk: [savings, job, time]

First ask me up to 6 hard questions, a few at a time. Wait for my answers.

Then:
1. The three biggest weak spots.
2. The numbers that must be true for it to work (customers per month, price, margin), with the sums.
3. A go, not yet or no-go call, and why.
4. Three cheap tests I can run this month.
5. What would change your mind.

Be honest, not encouraging. This is not financial advice. Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts or figures. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.

A short example

Fill the blanks, then paste. what you'll sell: a short note you already have. customer: a short note you already have. Leave the rest of the prompt as written.

The prompt · Gemini

Stress-test my business idea.

The idea: [what you'll sell]
Who'd buy it: [customer]
Why I think it'll work: [reasons]
Price and costs, roughly: [figures]
Competition: [who else does it]
What I'd risk: [savings, job, time]

First ask me up to 6 hard questions, a few at a time. Wait for my answers.

Then:
1. The three biggest weak spots.
2. The numbers that must be true for it to work (customers per month, price, margin), with the sums.
3. A go, not yet or no-go call, and why.
4. Three cheap tests I can run this month.
5. What would change your mind.

Be honest, not encouraging. This is not financial advice. Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts or figures. UK English.

Stay in this Gemini chat. Leave extensions off, including Gmail and Drive.

A short example

Fill the blanks, then paste. what you'll sell: a short note you already have. customer: a short note you already have. Leave the rest of the prompt as written.

1

You describe the idea, who'd buy it and why you think it'll work.

2

The assistant asks the hard questions about customers, price, competition and your time.

3

You get the weak spots, the numbers that must be true, a go/not-yet/no-go call and three cheap tests.

What happens

Use Gemini to stress-test a business idea before you quit your job

You've got an idea and a gut feeling it could work. Get it tested with the questions a hard-nosed friend would ask, the numbers that must add up and three cheap ways to test it this month.

Tools

Paste the prompt, fill the blanks, copy the draft.

  • Gemini — required. Drafts from the text you paste. Nothing is sent.

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