Validate your idea

Why this step matters

Most new products fail for a dull reason: not enough people wanted them badly enough to pay. Validation is the cheapest way to find that out. A few weeks of conversations and small experiments can save you months of building, a lot of money and a co-founder relationship that sours when nobody signs up.

Validation does not mean proving your idea is good. It means trying hard to prove it wrong and seeing whether it survives. You are testing three things in order: is the problem real and frequent, do the people who have it already spend time or money on it, and will they switch to you. If the answer to the first question is weak, the other two do not matter yet.

How to do it

1. Write the riskiest assumptions down. One sentence each: who has the problem, how often, what they do today, and what they would pay. Rank them by how badly the business breaks if they are wrong. Test the top one first.
2. Find 15 to 20 people who fit the customer profile. Use communities they already gather in (subreddits, Slack and Discord groups, LinkedIn, industry forums, local meetups). Avoid friends and family unless they are genuinely in the target group.
3. Run problem interviews, not pitches. Ask about the last time the problem happened, what they did, what it cost them and what they tried. Do not describe your solution until the end, if at all. Past behaviour is evidence; opinions about the future are not.
4. Look for patterns and quotes. After each call, note the exact words people use, the workaround they rely on and any money already being spent. If fewer than a third describe the problem without prompting, treat that as a warning. Transcribing calls and pasting the transcripts into an AI assistant to pull out recurring phrases and objections across interviews is a fast way to spot patterns once you have more than a handful of calls, but read the raw quotes yourself first so you do not miss context a summary flattens.
5. Size the opportunity roughly. Count how many people or companies match your profile using public sources (industry reports, government statistics, LinkedIn searches, app store categories). A rough bottom-up estimate is more useful than a big top-down number.
6. Run a smoke test. Build a one-page site that states the problem and the promised outcome, with a clear call to action: join the waitlist, book a demo or pre-order. Send it to the people you interviewed and to the communities you found them in.
7. Ask for a real commitment. A paid pilot, a deposit, a letter of intent or a pre-order is far stronger evidence than an email address. Even a small amount separates curiosity from intent.
8. Decide against a threshold you set in advance. For example: "at least 10 of 20 interviewees describe the problem unprompted and at least 3 agree to a paid pilot". Then choose to go ahead, pivot the segment or problem, or stop.

What it costs and how long it takes

Interviews cost nothing but time. A landing page can be built on a free or low-cost website builder, and a small paid ad test to drive traffic is optional. Expect one to three weeks of part-time work for a first round. If the results are mixed, a second round with a narrower segment is normal and cheaper than building the wrong product.

Free credits, perks and services that help

You rarely need paid tools at this stage. Survey and form tools, scheduling links, video call software and website builders all have free tiers, and several of them appear in startup perk bundles. Browse /perks for discounts on these tools and /best/website-builders for landing page options. If you are a student or a solo founder, the curated lists at /for/students and /for/solo-founders highlight programs with low entry requirements. Many accelerators also run pre-idea or idea-stage tracks with customer discovery workshops; see /accelerators.

Common mistakes

• Pitching instead of listening. Once people hear your idea they tend to be polite. Keep the first half of every conversation about their world.
• Asking hypothetical questions. "Would you use this?" invites a yes that costs them nothing. Ask what they did last time instead.
• Treating sign-ups as sales. A waitlist shows interest, not willingness to pay. Push for a commitment that costs something.
• Moving the goalposts. If you set no threshold before testing, you will find a reason to call any result a success.
• Testing the wrong audience. Feedback from people who will never buy, such as other founders reviewing your idea, is not validation.

Go deeper

IdeaChecker scores a business idea on problem, market, competition, timing, feasibility, economics, founder fit and fatal risks, gives a Build / Pivot / Kill verdict, and lists tools that help you run the tests above. Feed it the patterns and quotes from your interviews, not just the idea on paper, for a sharper verdict.