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.
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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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 intent.
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.
Before you start, 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 or idea you are testing, where it will appear in the product, 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 will be tracked.
Ensure the setup feels realistic.
Run the method.
Fake door testing is simple but precise.
Create a realistic entry point (button, link, CTA). Place it in a relevant part of the product. Track clicks or 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. Show a 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. Optionally capture interest (e.g. sign-ups or glossaryFeedbackFeedback is the system response that informs users about the result of their actions. It helps users understand what has happened and what to do next.Open glossary term).
Focus on glossaryBehaviourBehaviour refers to how users interact with a system, including actions, patterns, and responses.Open glossary term, not explanation.
Capture and make sense of it.
The value comes from real usage glossarySignalsSignals are data points or triggers that indicate changes in user behaviour, context, or external factors.Open glossary term.
After running the test: analyse glossaryInteraction RateInteraction rate is the percentage of users who interact with elements such as buttons, links, or features compared to those who view them.Open glossary term, compare against expectations, identify glossaryPatternA reusable solution to a common design problem.Open glossary term of interest, and decide whether to glossaryBuildA build is the process of compiling and packaging code into a runnable application.Open glossary term, refine, or drop the idea.
Use this to prioritise effectively.
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 glossaryBuildA build is the process of compiling and packaging code into a runnable application.Open glossary term the right things at the right time.
No guesswork. No assumptions. Just real glossarySignalsSignals are data points or triggers that indicate changes in user behaviour, context, or external factors.Open glossary term 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 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 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 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 important.
What can you measure?
Clicks, glossaryEngagementEngagement refers to how users interact with a product, content, or experience, including actions like clicks, time spent, and interactions.Open glossary term, and expressions of interest.
Does fake door testing improve UX?
Yes. It helps ensure you prioritise 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 users actually want.