Stop Shipping What Nobody Asked For
This is a How to Web event taking place during How to Web Conference 2026, exclusively available to How to Web Conference ticket holders, hosted by Marcin Klimaszewski, Founder of Product Build Day.
Buffer, the social media scheduling tool, got its first 120 signups from two pages and a pricing table before the app existed. Zappos, the online shoe shop, sold shoes it did not own: photos taken in local stores, the pair bought after the order came in. Both tested before they built.
Too often, teams skip that step. In a big company the product manager builds on opinion, because evidence costs a roadmap slot and a quarter of meetings. In a startup the founder builds for three months, because building feels like progress and testing feels like doubt.
This session is the skipped step, done live. The room picks a real idea, votes for the cheapest test that could kill it, and Marcin builds the prototype for that test with AI tools in front of you, rebuilds it on your feedback, and runs AI test users on it. By the end, you will have seen how rapid product discovery works from the first sentence to the go/no-go decision.
WHAT YOU WILL LEARN
What kind of tests give you the first signal on a business idea, and how to pick the cheapest one that hits your riskiest assumption.
How to vibe-code a prototype that lets you test your business idea. It is easier than the internet makes it look, and you do not need an engineer.
How to get rid of the obvious usability issues in minutes with AI test users, so real customers, or your manager, see your idea instead of a confusing screen.
GOOD TO KNOW
You leave with a signal, and the number that would make you stop. Bringing real people to the page is still on you. No coding at any point. Bring a laptop if you want to build along with your own tools or a free account; watching works just as well.
See you at How to Web Conference!
How to Web Conference brings together 3,000+ builders, founders, investors and tech professionals for three days of conversations, connections and ideas worth taking further.