Cut The SaaS, in a guide marked updated June 2026, says the strongest validation signal before launch is money or a committed signup, and that interviews plus one demand test usually take three to five weeks. A 14 day sprint is therefore a compressed version, built to give you an early go or no-go, not a final verdict.
This guide shows how to validate a startup idea in 14 days: a day by day plan, how to run customer interviews, how to build a smoke test landing page and a fake door, and how to set pass or fail numbers in advance. It draws on Cut The SaaS. Our plan is an adaptation of its steps, so scale the numbers to your market.
What Validation Really Means
Validation means finding evidence that real people have a real problem and will take a real action to solve it. Cut The SaaS says to go when you see real pain plus real action, such as signups, clicks or money, and to pivot or pass when you see polite nods and zero signups.
It lists what is not a signal: likes, follower counts and great idea replies. Our guide to validating a startup idea covers the wider method, and this article turns it into a 14 day schedule.
The 14 Day Plan at a Glance
This plan compresses the steps Cut The SaaS describes. It works best for a software, service or product idea you can describe in a sentence.
| Days | Goal | Activity |
|---|---|---|
| 1 to 2 | Define the problem and the audience | Write one sentence on who has what problem; list 40 people to approach |
| 3 to 8 | Interview the problem | Talk to as many of 15 to 30 people as you can, about their past behaviour |
| 9 to 10 | Build the demand test | Create a smoke test landing page and a pre-order or waitlist button |
| 11 to 13 | Drive traffic and watch | Send visitors to the page and track clicks, signups and payments |
| 14 | Decide | Compare results with the pass or fail numbers you set on day 2 |
If you cannot reach enough people in 14 days, extend the plan. The aim is evidence, not speed for its own sake.
Days 1 and 2: Write the Problem and the Pass Mark
Write one sentence: who has this problem, what they do today and what it costs them. Then set your pass or fail number before you run any test. Cut The SaaS says to do this because the page gives no universal conversion rate.
| Decision to write down | Example |
|---|---|
| Target customer | Freelance designers who invoice clients |
| Problem | Chasing late payments takes hours each month |
| Pass mark for interviews | At least 5 of 15 say they have paid or tried a workaround |
| Pass mark for the demand test | At least 20 waitlist signups from 300 visitors, or 3 pre-orders |
The numbers in the example are illustrations, not benchmarks. Choose numbers that would genuinely convince you to spend months building.
Days 3 to 8: Customer Interviews That Reveal the Truth
Cut The SaaS advises talking to 15 to 30 people in your target market about their past behaviour, not your idea, and to stop when three people in a row tell you nothing new. Ask what is hard and what they did last time. Avoid asking would you buy this.
| Ask this | Not this |
|---|---|
| What is the hardest part of this? | Would you use my app? |
| What did you do the last time it happened? | Do you think this is a good idea? |
| What does it cost you now? | Would you pay for it? |
| What have you already tried? | What features do you want? |
Look for budgets that already exist. The source says people paying for a workaround are likely to pay for a fix. If you need a place to begin, our list of startup tools for a tight budget can help you set up quickly.
Days 9 to 13: Smoke Test and Fake Door
A smoke test landing page describes the product as if it exists and offers an email signup or pre-order button. Cut The SaaS recommends driving 200 to 500 visitors to it. A fake door test adds a button or pricing tier for an unbuilt feature and counts clicks; it suggests 7 to 14 days and at least 300 sessions per audience, with an honest coming soon message and waitlist after a click.
| Test | What you measure | Honest handling |
|---|---|---|
| Smoke test landing page | Signups or pre-orders from 200 to 500 visitors | Say the product is not built if asked |
| Fake door button | Clicks on a feature that does not exist yet | Show coming soon and offer a waitlist |
| Pre-sale | Money or a committed signup | Refund promptly if you do not build |
Be honest on the page and in follow-up emails. Never take money for something you do not intend to deliver.
Day 14: Decide Go, Pivot or Stop
Compare your results with the numbers you wrote on day 2. If you see real pain plus real action, move to a small build or a longer test. If you see polite nods and zero signups, pivot the problem or the audience, or stop.
| Result | Next step |
|---|---|
| Strong interviews and strong demand test | Plan a small first version and keep selling |
| Strong interviews, weak demand test | Change the offer, the audience or the page, and retest |
| Weak interviews | Pivot to a different problem or customer |
| Mixed | Run a second 14 day sprint with sharper questions |
Our guide to the lean startup method explains how to keep learning in short cycles. For idea inspiration, see our list of micro SaaS ideas for solopreneurs.
