The fastest way to invalidate a SaaS idea is not to build an MVP. It is to manually do the job the product would automate and see whether anyone pays before you automate anything. Manual delivery validates the job, the price, and the customer — without the sunk cost of a build.
Willingness to pay cannot be measured through surveys or interviews — it can only be observed through actual transactions. Founders who delay pricing are not being cautious. They are systematically avoiding the one experiment that would tell them whether their product has economic value.
Pre-launch waitlists measure curiosity, not intent. A signup costs the user nothing and commits them to nothing. Founders who mistake a large waitlist for product-market fit are optimizing for a metric with no predictive validity for revenue.
Validation by analogy — it worked for Slack, why not for us — is the most common and least useful form of market research. It describes what was possible in a different context, for a different team, at a different time. None of those variables transfer to your situation.
Using AI to generate your first version and using AI to learn your market are two different activities. The code is now cheap to produce. The insight that tells you what to build is not. Founders who conflate the two end up with faster-produced products that solve the wrong problem.
Check the list of useful tools for the SaaS validation interviews.
Real conversations are one of the most powerful methods to validate a SaaS product.
