Is ChatGPT Enough to Validate an Idea?It is enough for the one part that decides nothing. Eight steps side by side — the input, the method, the objections, the checking, the verdict, the build question, the demand test, closing the loop — plus what ChatGPT does better than us.
Can AI Validate a Startup Idea?What an AI can settle from text alone, what only a payment can settle, and why no prompt adds a step that does not exist — being asked instead of typing, three models checking each other, a landing real people sign up on, and a record of how far the prediction missed. Our own limits included.
Is My Business Idea Good?Nine questions that decide whether an idea is worth building — with what counts as an answer and what does not.
A Validation Prompt That Argues BackCopy-paste prompts that make ChatGPT or Claude challenge your idea instead of praising it — plus three checks that show where a prompt stops.
Free Startup Idea ValidatorNine 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.
How to Validate a Business IdeaFive methods compared by what each can actually prove, the three questions any validation has to answer, and the mistakes that cost founders a year.
The Validation Tools ComparedValidatorAI, 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.
Roast My Website — Free AI AuditPaste a URL and get it torn apart across 11 categories by personas drawn from Reddit, Hacker News and G2. Free, no account.
Website Audit: What 8 Tools Actually CheckThe three layers of a website audit — technical, content, conversion — and which of the eight common tools covers which of them.
Lean Canvas: A Founder's GuideAsh Maurya's 9-box template for early-stage hypotheses. Lean Canvas vs BMC, fill order, worked example, Build-Measure-Learn.

Customer Research

Market Research

AI Focus Groups: What They Can DecideA synthetic panel sorts twelve options into three in twenty minutes and cannot close a decision, because a persona has no last time to tell you about. Task by task: what it settles, what needs people who exist, and how to measure the gap.
TAM, SAM, SOM: Market Sizing ExplainedHow to size your market without making numbers up. Real examples, common mistakes, and a free interactive calculator.
Van Westendorp Price Sensitivity MeterFour questions, four curves, four price points. Paste your survey responses into the free calculator — and read what the method cannot tell you.
Gabor-Granger Pricing MethodA ladder of prices, one yes-or-no question at each. Free calculator: demand curve, revenue curve, and the band your sample can actually resolve.
Kano Model Feature PrioritizationTwo questions per feature instead of one importance score. Free calculator: the six categories, and how many answers it would take to change each verdict.
Willingness to Pay: What Counts as ProofFive rungs of evidence from “sounds useful” to “paid again”, why weak evidence never adds up to strong, and a free tool that grades what you actually have.
Value-Based Pricing and Economic ValueBuild the price from what it is worth to the buyer. Free calculator for economic value — and an honest count of how much of the result you guessed.
Price Laddering: Good, Better, BestPricing tiers people actually climb. A free checker for the step between rungs, what each adds, and the tier that only costs more.
Price Elasticity of DemandHow much volume moves when price does — with a free calculator that uses the midpoint formula and shows what the simple one would have told you instead.
Porter’s Five Forces AnalysisFive structural pressures that decide an industry — with a free scorecard that reports the binding force instead of an average, and says how much the average flattered you.

Decision Frameworks

Go/No-Go Decision FrameworkThe 7 criteria, the meeting structure, the common mistakes, and how to apply Go/No-Go to startup launches and pivot decisions.
RICE Prioritization FrameworkReach × impact × confidence ÷ effort — with a free calculator that also says how much the estimates would have to be wrong before the order changes.
MoSCoW Prioritization MethodMust, should, could, won’t — and the rule everyone forgets, that no more than 60% of effort belongs in Must. Free planner that checks the shares.
North Star Metric and How to Test ItThe criteria a candidate metric must pass — and the test almost nobody runs: name a way the number could rise while customers are worse off.

The validation library

The catalogue

Validation

Customer Research

Market Research

Decision Frameworks

The journal