Smoke Test

What Is a Smoke Test?

A smoke test is a fast, cheap experiment designed to answer one question: will anyone actually want this? Instead of spending months building a product, you build a stand-in, usually a landing page, an ad, a waitlist form, or a pre-order button, and measure whether real people take a real action. If nobody clicks, signs up, or pays, you've saved yourself months of wasted engineering.

The term comes from hardware and electronics testing, where engineers would power on a new circuit and watch for smoke before running full diagnostics. In startups, the metaphor holds: you're checking for an obvious failure before investing serious resources.

Why Smoke Tests Matter for Early-Stage Founders

Most failed startups don't fail because they built the product badly. They fail because they built something nobody wanted. A smoke test is the cheapest insurance against that outcome.

For a founder with limited runway, a smoke test does three things:

• Cuts build risk. You find out if there's demand before writing a line of production code.
• Speeds up decisions. A test that takes days gives you an answer faster than a build that takes months.
• Sharpens your pitch. Watching real people react to your landing page copy tells you which value proposition actually resonates, which is useful for fundraising and future marketing.

If you're pre-launch and considering welaunch.sh or any other launch tool, a smoke test is usually the step that comes right before you decide what's even worth launching.

How to Run a Smoke Test

The format varies, but the core structure is always the same: make an offer, put it in front of real people, and measure the action rate.

Common smoke test formats

1. Landing page + email capture. Describe the product, add a "Notify Me" or "Join Waitlist" button, and drive traffic to it.
2. Fake door test. Add a button or feature that looks live but leads to a "coming soon" message when clicked, measuring interest in a specific feature.
3. Pre-order or deposit page. Ask people to pay (even a small refundable deposit) before the product exists. This is the strongest signal because money is on the line.
4. Ad-only test. Run paid ads pointing to a simple page and measure click-through and conversion rate without building anything else.
5. Concierge test. Manually deliver the promised outcome to a handful of users to see if they value it, before automating anything.

Basic formula

Smoke test conversion rate = (number of desired actions / number of visitors) x 100

Example: You run a $200 ad campaign driving traffic to a landing page for a new invoicing tool. You get 1,000 visitors and 45 email signups.

Conversion rate = 45 / 1,000 x 100 = 4.5%

Whether that's good depends on your traffic quality and offer strength, but it gives you a number to compare against future tests and industry benchmarks.

Benchmarks to Use as a Gut Check

These vary by category, but rough ranges for a cold-traffic smoke test landing page are:

• Below 1%: Weak signal. Either the offer isn't compelling or the traffic is poor quality.
• 1% to 3%: Modest interest. Worth digging into the copy and audience before deciding.
• 3% to 8%: Solid signal for an early-stage concept test.
• Above 8%: Strong signal, especially if traffic wasn't hand-picked superfans.

For pre-order or deposit-based smoke tests, even a conversion rate of 0.5% to 2% can be meaningful, because the bar (paying money) is much higher than an email signup.

Common Mistakes

• Testing with friends and family traffic. Warm audiences inflate conversion rates and hide the real signal. Use cold or semi-cold traffic whenever possible.
• Vague offers. If your landing page copy is fuzzy about what the product does, low conversion tells you nothing about actual demand.
• No clear success threshold set in advance. Decide what number counts as "go" or "no-go" before you launch the test, not after you see the results.
• Confusing curiosity with intent. Email signups are a weaker signal than a $5 deposit. Weight your results accordingly.
• Running the test too long or too short. Give it enough time to get statistically meaningful traffic, but not so long that market conditions shift underneath you.

Smoke Test vs. MVP

A smoke test measures interest before you build anything functional. An MVP is a stripped-down but real, working version of the product. Think of the smoke test as validating the demand side of the equation, and the MVP as the first attempt at delivering the supply side. Many successful products run several smoke tests before ever writing an MVP, since each test can reshape the offer, the audience, or the pricing before real engineering time gets spent.