Decisions, numbers, and the occasional mistake from building software products — plus the guides that do not change.https://peterbartfai.comenhttps://peterbartfai.com/guides/what-counts-as-validationhttps://peterbartfai.com/guides/what-counts-as-validationSign-ups aren't proof and interest isn't proof. Here's the test I use now, and what it looked like when I applied it to my own product.Tue, 01 Sep 2026 00:00:00 GMTGuidesvalidationsolo builderproduct strategyhttps://peterbartfai.com/guides/why-ai-shouldnt-build-your-software-in-one-gohttps://peterbartfai.com/guides/why-ai-shouldnt-build-your-software-in-one-goYour 20-page document will fit, and the AI will build something. The problem is everything it decides for you along the way, and what that costs you later.Tue, 01 Sep 2026 00:00:00 GMTGuidesplanningaiworkflowsolo builderhttps://peterbartfai.com/guides/five-step-validation-blueprinthttps://peterbartfai.com/guides/five-step-validation-blueprintHow to get from one real problem to 10 paying customers without writing a product. Written for people building software for other businesses.Tue, 01 Sep 2026 00:00:00 GMTGuidesvalidationb2bsolo builderproduct strategy