📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
The single best thing ever written on customer conversations. It teaches you to ask about the customer's life and past behaviour, not your idea, so you can't be lied to. If a founder reads one thing before talking to a single customer, it's this.
From
momtestbook.com
by Rob Fitzpatrick
~130 pages
- Talk about their life, not your idea.
- Ask about specifics in the past, not opinions about the future.
- 'That's so cool, I'd totally buy it' is a compliment, not data, dig for commitment and evidence.
Open
momtestbook.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
The cleanest distillation of the one framework that turns a customer chat into a relationship instead of a survey. The three rules (talk about their life not your idea, ask about the past not hypotheticals, and chase real commitments of time, reputation, or money) are exactly how you get an early customer to tell you what nearly stopped them from buying and who else you should talk to. Rekhi is a product leader, so the examples are operator-grade, not book-report fluff.
From
Sachin Rekhi's Blog
by Sachin Rekhi
10 min read
- Never pitch your idea in the conversation; ask how they handle the problem today and what it costs them, so praise can't lie to you.
- The strongest signal is a commitment that costs them something: a trial, an intro to a colleague, or a pre-order.
- 'Would you buy this?' teaches you nothing; 'walk me through the last time you dealt with this' surfaces the real story and the referral.
Open
sachinrekhi.com →
📄 Article
✓ Link checked
Freemium
Intermediate
Why we picked it
The most concrete guide to actually measuring what customers will pay, including survey methods and tier design. It turns pricing from guesswork into a research-driven process.
From
lennysnewsletter.com
by Lenny Rachitsky & Patrick Campbell
long-form guide
- Measure willingness to pay directly through structured customer research
- Design tiers around distinct customer segments, not arbitrary feature bundles
- Localize pricing by market and currency to capture willingness to pay everywhere
Open
lennysnewsletter.com →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
Turns the vague feeling of product-market fit into a number you can move. Ask users how they would feel if they could no longer use the product, then track the share who say 'very disappointed'. Under 40 percent means keep working. A test you can run on an idea long before you scale it.
From
First Round Review
by Rahul Vohra
~20 min read
- The 40 percent 'very disappointed' benchmark for product-market fit.
- Segment to your high-expectation customers and build for them.
- Make the fit score a metric you improve quarter by quarter.
Open
review.firstround.com →
📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
Savoia, who led early Google AdWords, argues most ideas fail because nobody wanted them, and teaches pretotyping: cheap experiments that generate your own data on real demand before you build. You get concrete tactics like the fake-door and the mechanical-turk test, plus a way to demand skin-in-the-game commitment rather than opinions. Practical for anyone who wants a test that can prove them wrong.
From
Alberto Savoia
by Alberto Savoia
~250 pages
- Collect your own data on real behaviour instead of trusting opinions
- Pretotype the idea to test demand before you build a prototype
- Measure commitments like a signup or a payment, not verbal enthusiasm
Open
albertosavoia.com →
📖 Book
✓ Link checked
Free
Beginner
Why we picked it
A free, short predecessor to The Right It for when you want the method without buying a book. It lays out cheap experiments (fake buttons, manual concierge, pre-orders) that reveal whether people will act, not just nod. Worth reading before you spend a single rupee on building.
From
pretotyping.org
by Alberto Savoia
~90 pages
- Test the core experience with the smallest possible time and money.
- Watch what people do when asked to commit, not what they say.
- A single well-run experiment can kill or confirm an idea in a day.
Open
pretotyping.org →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
CB Insights read hundreds of real startup postmortems and found that poor product-market fit (around 43 percent) is the single biggest root cause of failure, ahead of running out of money. If you want to spot the warning signs early, start with the patterns of founders who already hit them: a market too small, a problem not painful enough, a product nobody urgently wanted. Treat it as a checklist of ways an idea can quietly go nowhere for a year.
From
CB Insights
by CB Insights
~15 min read
- The top root cause of failure is building something with no real market need, not running out of cash (cash is usually where the story ends, not why).
- Weak demand often hides behind early traction, so polite interest and a few friendly users can mask an idea that never widens into a market.
- The list doubles as an early-warning checklist: if your idea already leans on bad timing, thin unit economics, or a problem people can live with, take that seriously now.
Open
cbinsights.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
A concrete, step-by-step account of collecting real pre-sale money before building, from a founder who actually did it. Unlike theory, it shows the messy specifics: who to approach, what to say, and how many said yes with a card out. A good template for running your own pre-order test.
From
Indie Hackers
by Indie Hackers community
~12 min read
- Real pre-payment is a far stronger signal than an email signup.
- Approach people already living the problem, not a cold audience.
- Cap the pre-sale and watch the conversion to estimate true demand.
Open
indiehackers.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
A clean, practical playbook for the mechanics: where to place the door, what to measure, and how to avoid annoying the people who walk through it. It covers the in product version (a button for a feature you have not built) alongside the standalone landing page, so you see both shapes of the test. Good for turning the concept into a concrete plan you can ship this week.
From
Learning Loop
~12 min read
- The door can be a button inside an existing product, not only a new page
- Decide your success metric and sample size before you launch
- Show a graceful coming soon message so testers do not feel tricked
Open
learningloop.io →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
A practical roundup of demand-testing models, including the 'dry wallet' or pre-sales test where you ask for payment before the product is ready. It lays the methods out side by side so you can pick the one that fits your stage and risk. Clear, free, and it names the trade-offs.
From
RevenueCat Blog
by RevenueCat
~15 min read
- A pre-sales (dry wallet) test asks for money and is the strongest signal.
- Different validation methods fit different stages and levels of risk.
- A signup shows curiosity; a payment attempt shows willingness to pay.
Open
revenuecat.com →
Why we picked it
The permission slip to recruit users by hand, do things manually, and deliver 'insanely great' experiences to your first few customers. The cheapest, most honest way to validate demand is to go get it one person at a time.
From
paulgraham.com
by Paul Graham
~15 min read
- Recruit your first users manually, don't wait for them to come.
- A tiny group of users who love you beats a big group who like you.
- Manual, unscalable effort early is a feature, not a failure.
Open
paulgraham.com →
