Strategy
Fake Door Testing
A practical product validation method for measuring demand with real user behaviour before committing engineering effort.
How to use fake door testing to validate demand for unbuilt ideas, prioritise what to build, and reduce product risk through real behavioural signals.
What it is
Fake door testing is a UX method used to measure real user interest in a glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term, product, or glossaryServiceA service is a component or function that performs a specific task within a system.Open glossary term before it exists.
Users are presented with something that looks real, such as a button, link, or glossaryCall to ActionA call to action is a prompt that encourages users to take a specific action.Open glossary term, but when they interact with it, they are informed that the glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term is not yet available.
The glossaryInteractionInteraction refers to any action a user takes within a product and how the system responds. It includes clicks, taps, gestures, and inputs that drive the user experience.Open glossary term is tracked to understand demand and glossarySearch IntentSearch intent is the underlying goal or purpose behind a user’s query, such as finding information, making a purchase, or navigating to a specific site.Open glossary term.
It is often used on live products to validate ideas using real glossaryBehaviourBehaviour refers to how users interact with a system, including actions, patterns, and responses.Open glossary term rather than assumptions.
The focus is on what users do, not what they say.
The goal is to determine whether something is worth building.
Fake door testing is most useful when the key question is demand, and you need behaviour evidence before building.
When to use it
Use this method when you need to validate demand.
It is most useful when:
It is less useful when:
Fake door testing is often used in product discovery and validation.
Key takeaway
Use fake door testing when you need real demand signals to decide if an idea deserves build investment.
How to run it
Set up properly
Be clear on the glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term you are testing, where the entry point appears, and how glossaryInteractionInteraction refers to any action a user takes within a product and how the system responds. It includes clicks, taps, gestures, and inputs that drive the user experience.Open glossary term are tracked. Placement determines the result as much as the idea does.
Decide what people see after clicking, and make it respectful. A fake door that wastes somebody's time without explanation damages glossaryTrustUser confidence that a product, service, or organisation will do what it promises.Open glossary term for a glossaryDataData is raw, uninterpreted information collected and stored so it can be analysed, processed, or used to inform decisions. On its own it carries no meaning; context and interpretation are what make it useful.Open glossary term point.
Run the method
Fake door testing measures demand for something that does not exist yet, by putting a realistic entry point in front of real users. It is cheap, fast, and ethically finely balanced.
- Create an entry point that looks genuine and describes the glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term honestly.
- Place it where somebody would plausibly look for that glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term, rather than where it will attract the most clicks.
- Track glossaryInteractionInteraction refers to any action a user takes within a product and how the system responds. It includes clicks, taps, gestures, and inputs that drive the user experience.Open glossary term, distinguishing deliberate clicks from exploratory ones by looking at what people did next.
- Show a clear message explaining the glossaryFeatureA feature is a specific piece of functionality within a product that delivers value to users. It represents something users can do or experience as part of the overall product.Open glossary term is not available yet, apologise for it, and mean it.
- Optionally capture interest through a sign-up, which is a much stronger demand signal than a click.
Keep it brief and keep it honest. Fake doors are best run for a short window and taken down; leaving one indefinitely is a decision to mislead.
Capture and make sense of it
The value comes from measuring glossarySearch IntentSearch intent is the underlying goal or purpose behind a user’s query, such as finding information, making a purchase, or navigating to a specific site.Open glossary term cheaply. After the test, document:
- Click-through against a realistic expectation, set in advance
- How many went further and left contact details
- Where the interest came from, by segment
- Whether demand justifies building, including when it does not
Use this to avoid building unwanted things. Treat a negative result as the successful outcome it is.
What to look for
Focus on:
Where it goes wrong
Most issues come from:
If glossaryTrustUser confidence that a product, service, or organisation will do what it promises.Open glossary term is broken, it can backfire.
What you get from it
Done properly, this method gives you:
Key takeaway
It helps you build what people actually want.
Get in touch
If this sounds like something you need, we can help you validate demand using fake door testing so you build the right things at the right time.
No guesswork. No assumptions. Just real signals from real users.
FAQ
Common questions
A few practical answers to the questions that usually come up around this method.
What is fake door testing in UX?
It is a method for measuring interest in a feature before it exists.
When should you use fake door testing?
Use it when validating demand for new ideas.
Is it deceptive?
It can be if handled poorly, so transparency after interaction is important.
What can you measure?
Clicks, engagement, and expressions of interest.
Does fake door testing improve UX?
Yes. It helps ensure you prioritise features users actually want.
Quick take
If you want to know if people want something before building it, put a door there and see who tries to open it.
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