Evergreen reference for the questions founders keep coming back to. Validation, customer discovery, decision frameworks. No fluff, no chronology — just the parts that matter.
Nine questions that decide whether an idea is worth building — with what counts as an answer and what does not.
Read guide →Copy-paste prompts that make ChatGPT or Claude challenge your idea instead of praising it — plus three checks that show where a prompt stops.
Read guide →Nine questions, a score out of 100 and the first thing to go find out, running in your browser with no signup. Plus the buyer's guide to the paid tools.
Read guide →Five methods compared by what each can actually prove, the three questions any validation has to answer, and the mistakes that cost founders a year.
Read guide →ValidatorAI, IdeaProof, Preuve, DimeADozen and us on seven axes: how the idea gets in, what checks the output, how the verdict forms, and where we lose.
Read guide →What an AI panel can and cannot tell you, and the four checks that separate a calibrated one from a merely confident one.
Read guide →Rob Fitzpatrick's book in 10 minutes — the 3 rules, what good questions look like, the compliments to ignore, and how to practice.
Read guide →Steve Blank's framework for figuring out whether your idea will work — before you build it. The 4 phases, the 5 steps, common mistakes.
Read guide →The 7 criteria, the meeting structure, the common mistakes, and how to apply Go/No-Go to startup launches and pivot decisions.
Read guide →How to size your market without making numbers up. Real examples, common mistakes, and a free interactive calculator.
Read guide →How to recruit, run, and synthesize customer interviews. 30 tested questions organized by intent, plus the 5 that always lie.
Read guide →VoC for founders and small teams. The 4-layer framework, 8 data sources, the metrics that matter, and a 90-day quick-start.
Read guide →Christensen's framework for why customers buy. The milkshake story, the 4 forces of switch, and the switch-interview format.
Read guide →How to plan, recruit, run, and synthesize user interviews. The 5 types, the 60-min structure, recruiting channels, and tools.
Read guide →Ash Maurya's 9-box template for early-stage hypotheses. Lean Canvas vs BMC, fill order, worked example, Build-Measure-Learn.
Read guide →Looking for shorter reads?
Opinions, deep dives, and what we learn building GoNoGo. Updated regularly, posts are dated, and we link back to these guides where relevant.
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