Transparency

AI transparency.

How AI is used on this site, in plain terms.

This site uses AI to help create its content. Here is how, in plain terms.

Everything published on ProductBuildDay.com is made with AI assistance and approved by a human before it goes live. A person writes the brief, guides the work, then reads and signs off on every piece. Nothing here is published automatically.

AI helps with drafting and research. A human makes the final call on every word, every claim, and every recommendation. If it is on this site, a person read it and stood behind it.

This note exists because the EU AI Act (Article 50) asks anyone who uses AI to generate content to say so. This page is that disclosure. No hidden automation, no pretending a machine did not help.

Questions

Questions about how this site uses AI? Get in touch.

Product Build Day. One day in. One decision out.

One-day, in-person vibe-coding build days where product people who do not code build working apps with AI tools and test them the same day. Tools like Lovable, Bolt, Replit, and Cursor do the typing. You do the thinking. Run in English across Europe by Marcin Klimaszewski.

Product Build Day // Pro, 690 EUR per seat

Build it. Test it. Pitch it. One-day AI prototyping training for product managers and designers in Berlin on 26 November 2026. Build a working prototype against one shared brief, test it with users and pitch it to the people who decide. A curated group of 12, 690 EUR per seat until 31 October, 790 EUR after, invoiced to your company, no VAT. See the Berlin training.

Product Build Day // Teams, from 7,900 EUR net

The same method inside your company. Up to 20 people build against your riskiest bets, with synthetic user testing included, real-user testing optional, a written debrief within a week, and a go, pivot, or stop decision made in the room. About 395 EUR a head at full size, one invoice, NDA-friendly. It starts with a free 15-minute fit call. Book the call.

Free community evenings, autumn 2026

Free evenings run three hours, usually 18:00 to 21:00. Copenhagen runs 17:00 to 20:00. They are free, in English, 16 seats per city: Amsterdam 14 September, Copenhagen 15 September, Stockholm 16 September and Berlin 17 September. See all events.

Proof

21 non-coders shipped 21 working apps in one Saturday in Warsaw. A museum set the brief and 22 people built the answer in Athens. Ionian Technologies built four product directions in one private day in Thessaloniki and tested them on the street the same afternoon. Both public days sold out.

Contact

One inbox for everything: the contact form or contact@productbuildday.com. Answered within a business day.