Pick a channel and describe the feature
Choose a landing page, email, ad campaign, or in-app banner, and name the feature you want to test demand for.
Free MVP tool
Fake Door Test Builder
Plan a low-cost fake-door test with ready-to-use copy and the traffic you need for a reliable signal.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Get suggested test copy
A headline and call-to-action template tuned to the channel, ready to adapt to your feature.
See the volume needed for a reliable signal
Based on expected traffic, the tool estimates how many visitors and how long you need to reach a reasonably reliable click count.
Continue learning: Interest vs willingness to pay
Frequently asked questions
What is a fake-door test?
A test where you advertise a feature that doesn't exist yet, to measure real interest via clicks or signups before building it.
How many clicks count as a reliable signal?
As a rule of thumb, this tool uses 20 clicks as a floor — fewer than that is usually just noise from early visitors.
Is it ethical to advertise something that doesn't exist?
Yes, when handled honestly — tell people you're gauging interest and follow up, rather than letting them think it's available today.
How We Compare
| Feature | MVPHub | Unbounce | Google Ads |
|---|---|---|---|
| Channel-specific test copy suggestions | Included | Not included | Not included |
| Calculated reliable-signal threshold | Included | Not included | Not included |
| Actual page building and hosting | Not included | Included | Not included |
| Ad delivery and traffic | Not included | Not included | Included |
Unbounce builds and hosts the actual landing page; Google Ads drives the traffic. MVPHub plans the test itself — copy and the volume you need — before you build or spend on either.
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