Validation & Discovery
Fake Door Test
Fake Door Test is a validation method where you advertise a product or feature that does not exist yet (as a button, ad, or pricing tier) and measure how many people click or sign up. The clicks tell you whether real demand exists before you spend time building it.
Also known as: fake door, painted door test, fake door experiment
Why it matters
Most founders waste months building features nobody asked for, then call the silence 'we just need more marketing.' A fake door test forces the market to vote with a click before you write a line of code, so you find out if the demand is real in days instead of quarters. It is the cheapest way to separate a painkiller from a vitamin: if people will not even click a button for the thing, they will not pay for it. The numbers are also a forcing function for honesty, because a 0.3% click rate is hard to spin into a roadmap. Use it to kill weak ideas fast and to rank competing features by actual interest, not by who argued loudest in the planning meeting. The catch is that a click is intent, not money, so treat it as a green light to keep going, not as proof of product-market fit.
Formula
Fake door click-through rate = clicks on the fake feature / total people who saw it
Worked example
A project-management SaaS adds a 'Gantt View' button to its sidebar that, when clicked, opens a modal saying 'Coming soon, want early access?' with an email field. Over two weeks, 1,200 users see the button, 180 click it (15%), and 90 leave their email. That 15% click rate and 50% email capture is a strong signal to build it, whereas a similar test on a 'Crypto Payments' button gets a 0.8% click rate and gets shelved.
Common mistakes
- Treating clicks as purchase intent. A click means curiosity, not a credit card. Follow it with an email capture, a price, or a real checkout to test commitment, not just attention.
- Burning trust with no follow-up. A dead-end 'coming soon' with no email field or explanation annoys real users. Always capture interest and tell people what happens next.
- Testing with traffic too small to mean anything. With under a few hundred views, one or two clicks looks like a trend but is just noise. Decide your sample size and threshold before you launch.
Frequently asked questions
What is a good Fake Door Test click rate?
There is no universal number, because it depends on placement and audience, but a fake feature buried in a product that pulls 10% or more of viewers to click is a strong signal. For a cold ad or landing page, even 2% to 5% can be meaningful. What matters more than the raw rate is the comparison: run the same test format across several ideas and back the one that clearly outperforms the others.
Fake Door Test vs Smoke Test, what is the difference?
They overlap heavily and are often used interchangeably. A smoke test usually means a standalone landing page or ad for a product that does not exist yet, aimed at a cold audience. A fake door test more often means placing a non-functional button or feature inside an existing product to gauge interest from current users. Both measure demand before building.
How do you run a Fake Door Test without making users angry?
When someone clicks the fake door, never leave them at a blank wall. Show an honest message like 'This is in the works, want early access?' and capture their email or feedback. Some teams add a one-question survey or a small thank-you. The goal is to turn a moment of disappointment into a signal and a lead, not a complaint.
How many people do I need for a Fake Door Test to be valid?
Set your sample size and decision threshold before you start, so you are not tempted to read meaning into noise. As a rough floor, aim for a few hundred views before you trust a click rate, and more if the expected rate is low. If your traffic is tiny, run the test longer or push paid traffic to it rather than calling it after 30 visitors.
When should you not use a Fake Door Test?
Skip it when the cost of disappointing users is high, such as in regulated, medical, or financial flows where a dead end erodes trust badly. It is also weak for things people will not click on impulse but would pay for after a sales conversation, like enterprise contracts. In those cases use customer discovery interviews or a concierge MVP instead.
Does a Fake Door Test prove product-market fit?
No. A fake door measures interest and intent at the click level, which is the cheapest, weakest form of demand. Product-market fit requires people to actually use and pay for the real thing over time. Treat a strong fake door result as permission to build a real version and keep validating, not as a finish line.
Related terms
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Last updated 2026-06-09 · Back to the glossary