---
title: "Is My Startup Idea Validated? Score the Evidence You Have"
slug: is-my-startup-idea-actually-validated
description: "A signal is only as good as what it cost the person who gave it. Score the evidence you already have: cost-to-fake tiers, sample sizes, and false negatives."
canonical: https://preuve.ai/blog/is-my-startup-idea-actually-validated
author: Vincent
author_credentials: Founder of Preuve AI
date: 2026-08-18
last_updated: 2026-08-18
read_time: 9 min
---

# Is My Startup Idea Validated? Score the Evidence You Have

A signal is only as good as what it cost the person who gave it. Score the evidence you already have: cost-to-fake tiers, sample sizes, and false negatives.

## Key takeaways

- **Cost to fake is the variable that separates validation from encouragement:** a signal becomes reliable in proportion to what the person who gave it spent in money, time, or reputation. Most "validated" ideas have evidence only from the cheapest tiers.
- **Waitlist signups convert to paying customers at roughly 3%:** according to Gaurav Vohra's 2025 analysis. The rate halves with each year on the list, and the waitlist vendors publishing signup benchmarks do not quote it.
- **Sample size thresholds vary by signal tier:** at a 6.6% average landing page conversion rate (Unbounce, Q4 2024, 41,000 pages, published by a landing-page vendor), 200 targeted visitors is the minimum before a conversion rate means anything.
- **False negatives kill more good ideas than false positives waste time on bad ones:** wrong copy, wrong channel, or fewer than 200 visitors can reject a viable idea before it gets a fair test.

## FAQ

### How do you know if your startup idea is validated?
A startup idea is validated when you have evidence that a named kind of buyer will pay an actual number for a fix to a problem they already spend time or money on. The evidence must come from people outside your personal network, must involve a real cost to them (time, money, or reputation), and must reach a sample size large enough to distinguish signal from noise. Interview praise, waitlist signups, and social media engagement alone do not meet this bar.

### What is the difference between interest and validation?
Interest is free to give. Validation costs something. An email signup is interest. A pre-order with a credit card is validation. The gap between the two is where most founders stop collecting evidence. The key test: did the person incur a real cost (money, time, or reputation) to give you this signal?

### How many customer interviews count as validation?
Interviews rarely count as validation on their own, regardless of the number, because social pressure biases every conversation toward encouragement. What matters is whether the interviewee described a specific problem they already spend money or significant time solving, and whether they took a concrete next step (scheduled a follow-up, made an introduction, placed a deposit). Five interviews with concrete commitments outweigh fifty with compliments.

### Can waitlist signups validate a startup idea?
Not on their own. Gaurav Vohra's 2025 analysis found that waitlist signups convert to paying customers at about 3% within seven days, and the rate halves with each additional year. A waitlist measures topic interest, not purchase intent. To extract a validation signal from a waitlist, measure the conversion rate from signup to a higher-cost action like scheduling a demo or paying for early access.

### What is the most reliable startup validation signal?
Revenue from a stranger who found you without a personal introduction. That person discovered the product, evaluated it against alternatives, and decided it was worth paying for. No social pressure, no novelty bias, no favor to a friend. Five paying strangers are a stronger signal than a thousand waitlist signups.

Canonical HTML version of this post: https://preuve.ai/blog/is-my-startup-idea-actually-validated