Should I build a waitlist before an MVP?

Yes, if you still need evidence of demand. A waitlist takes days and tells you whether the promise and the audience are right before you spend months building.

How many waitlist signups are enough?

It depends on your market and price. A better question is whether signups match your target customer and respond to follow-up. Set your threshold before launching the page.

What if nobody joins my waitlist?

Treat it as information. Check that the right people saw it, that the promise is specific and that the call to action is clear, then test again before dropping the idea.

Is a waitlist the same as a fake door test?

They are closely related. Both measure interest in something that does not exist yet. A fake door test usually sits inside an existing product, while a waitlist is a standalone page.

Waitlist or MVP: Which Should You Build First?

Build a waitlist first when your biggest unknown is whether people want the outcome. Build an MVP first when demand is already clear and the unknown is whether your product can deliver the outcome. Let the riskiest assumption decide.

By Javier Alonso, Founder & CEO. Updated 2026-10-25.

Decide by the riskiest assumption

Ask which of these would kill the idea fastest if it turned out to be false:

Demand risk: "Will anyone care enough to act?" Start with a waitlist or landing page. It takes days, not months.
Delivery risk: "Can we actually produce this outcome?" Start with the smallest MVP or a manual version of the service that proves you can deliver.

Most early ideas carry demand risk, which is why a waitlist is usually the better first test. Products whose edge is technical, such as a new model or hardware, may need to prove delivery first.

What a useful waitlist page needs

A generic "coming soon, sign up" page tests nothing. A useful one makes a specific promise to a specific person:

Headline: the outcome, for whom. "Get paid on time without chasing clients, for freelance designers."
Two or three lines on how it works and what it replaces.
One call to action that costs a little effort: email plus one qualifying question, a short survey or booking a call.
A follow-up plan: email every signup within a day and ask what made them join.

Drive qualified traffic to it from the places your ideal customer already spends time. Fifty visitors who match your profile tell you more than five thousand who do not.

How to read the results

Look at who signed up, not just how many. Signups that match your customer profile and answer your follow-up question are real signal. Anonymous signups from a broad audience are not.

Useful numbers to track are the conversion rate from qualified visitors to signups, the share of signups who reply to a follow-up, and how many agree to a call. Set the threshold that would justify building before you launch the page.

If nobody joins, that is valuable too. Before you drop the idea, check the audience, the channel and the promise. A better headline sent to the right people often changes the result.

Example

Two founders want to build a tool that turns customer support tickets into product roadmap themes. Their risk is demand: do product managers care enough? They publish a page aimed at product managers at 20 to 200 person software companies, post it in three product communities and send it to 40 people from their network. Of 180 qualified visitors, 31 join and answer a question about their current process. Twelve agree to a call. That is enough to build a narrow first version. Had it been 3 signups, they would have rewritten the promise and tested again before writing any code.

For your role

Founders: A waitlist also gives you your first launch audience. Keep in touch with signups while you build.
Builders: If you have an idea but no product yet, a waitlist is the cheapest way to find out whether the idea deserves your time.

Primary sources

Principles — The Lean Startup

Common questions

Should I build a waitlist before an MVP?: Yes, if you still need evidence of demand. A waitlist takes days and tells you whether the promise and the audience are right before you spend months building.
How many waitlist signups are enough?: It depends on your market and price. A better question is whether signups match your target customer and respond to follow-up. Set your threshold before launching the page.
What if nobody joins my waitlist?: Treat it as information. Check that the right people saw it, that the promise is specific and that the call to action is clear, then test again before dropping the idea.
Is a waitlist the same as a fake door test?: They are closely related. Both measure interest in something that does not exist yet. A fake door test usually sits inside an existing product, while a waitlist is a standalone page.

Put it into practice

Demo Studio publishes a proof page with signup capture, so you can test the promise before building the product.

Build a demo page