Why this matters
Words in interviews are cheap; an email address is a small act of commitment. A smoke-test page pitches the product as if it exists and measures who signs up, the fastest honest signal of demand you can buy before building anything.
What "done" looks like
- A live one-page site pitching the product's outcome, with your value proposition as the headline
- One CTA: "Join the waitlist" / "Get early access," wired to store emails
- Analytics counting visitors and signups (so conversion is computable)
- A thank-you step that asks one question: "What made you sign up?"
How to do it
- Build it in a day with any landing page tool or template, polish the copy, not the pixels.
- Pitch the finished product honestly framed as upcoming: what it does, for whom, 3 bullet benefits, maybe a mockup image. No fake "buy now" that takes money.
- Wire the funnel: CTA → email capture → thank-you page with the one follow-up question. That question's answers are interview gold.
- Set your threshold in advance, e.g. "10%+ of targeted visitors sign up = strong; under 3% = weak." Deciding after seeing data is self-deception.
- Keep the emails warm: send a short founder note within a day; these are your first users and interviewees.
Common mistakes
- Sending random traffic and judging conversion as if it were targeted
- Vague "coming soon" pages that test curiosity, not the actual pitch
- Collecting signups and never talking to any of them
Real-world examples
- Buffer started life as a smoke test. Before writing the app, founder Joel Gascoigne put up a two-page site: page one explained what Buffer did, and clicking "Plans and Pricing" led to a note saying "you caught us before we're ready" plus an email field. Only after signups came in did he add a pricing page with free, $5, and $20 plans to test willingness to pay.
- The pattern is now standard lean-startup practice: describe the product as if it's live, put a real call-to-action (email capture or a "Buy" button that leads to a waitlist), and measure how many people actually click. What you're buying is proof of demand before you spend weeks building.
- Pair the page with a small burst of traffic so the signal means something, see drive 100 visitors to the page and measure signup conversion.
From a founder's point of view
A smoke test is uncomfortable on purpose: you're pitching something that doesn't exist yet and watching whether strangers care. That discomfort is the point, an empty email list after real traffic is a cheap, honest "no," and it's far kinder than the same answer after six months of building. The founders who get value here treat the page as an experiment with a clear pass/fail line, not as a launch.
Rule of thumb
A smoke test measures the pitch, not the dream: if the page cannot convert warm, targeted visitors, the product underneath it will not either.