A fake door test validates demand for a feature or product before building it: the team ships only the entry point — a button, menu item, pricing tier or landing page for something that does not yet exist — and measures how many users try to walk through the “door.” Clicks, signups and waitlist joins quantify real intent at a fraction of development cost. It is the sharpest tool in the validation kit precisely because it measures behaviour rather than survey answers.
Execution discipline separates insight from damage. Define the success threshold before launch (what click-through rate justifies building?), cap the exposure (show the door to a small random cohort, briefly), and close the loop honestly — users who clicked should see a candid “coming soon, join the list” rather than an error or silence. Run too long or too widely, fake doors burn trust and pollute the brand with phantom features; run crisply, they kill bad roadmap bets in days.
The legal boundary
The method lives next to a real line: consumer-protection and unfair-commercial-practice rules prohibit misleading commercial communication. A fake door framed as exploration (“interested? join the waitlist”) is research; a fake door that takes payment, promises availability or announces a non-existent capability as live drifts toward misleading advertising — in Türkiye, territory governed by the Consumer Protection Law and the Commercial Advertisement Regulation, and policed by the Advertisement Board. B2B is not exempt: representing vapourware as shipping functionality in sales processes creates contractual misrepresentation exposure. The safe pattern is transparency at the moment of click and no money taken on phantom doors.
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