📖 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
This is the cleanest statement of why a big waitlist number can fool you: it only ever goes up, and joining costs a person almost nothing, so it has near-zero connection to whether anyone will actually pay. It is a useful starting point because it does not just criticize, it shows two ways to add real signal (track how many waitlist people convert, and charge a deposit for a spot, Tesla Model 3 style). Read it before you put a signup count in any pitch or investor update.
From
whoisnnamdi.com
by Nnamdi Iregbulem
~8 min read
- A raw waitlist count is a cumulative number that never falls and has no intrinsic link to customer value, so it flatters your pride more than it proves demand.
- Because joining imposes almost no cost, high signups mostly measure curiosity. The real signal is the conversion rate from waitlist to paying customer.
- Charging even a small deposit for a spot (as Tesla did with the Model 3) turns a soft signal into a costly commitment that actually indicates demand.
Open
whoisnnamdi.com →
✍️ Essay
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Free
Intermediate
Why we picked it
Written by the person who grew Superhuman's waitlist past half a million, so it is candid about what a big number does and does not mean. He argues the list is a marketing asset, not evidence of demand, and shows what to measure instead. Useful precisely because it comes from someone who ran a famous waitlist.
From
Growth by Gaurav (Substack)
by Gaurav Vohra
- A large waitlist proves interest in your message, not your product.
- Curiosity signups inflate the number without adding intent.
- Convert the list into conversations and paid commitments early.
Open
substack.gauravvohra.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
A short, plain piece that names the exact trap in this question: a curiosity click reads as demand when it is not. It gives concrete ways to add cost to joining so the signal means something. Good quick read to hand a co-founder who is celebrating raw signups.
From
saasvalidation.tech
- A free email captures curiosity, not willingness to pay.
- Add friction (deposit, application, referral) to filter for intent.
- Measure what people do after joining, not the join itself.
Open
saasvalidation.tech →
📄 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 →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
The canonical fake-door test, told by the founder who ran it. Buffer started as a two-page site: one page pitched the tool, a pricing button led to an email capture, and every signup got a personal note. Real demand, real conversations, a paying customer in weeks, and not a line of product code.
From
Buffer
by Joel Gascoigne
~10 min read
- Test willingness to pay with a pricing page before you build.
- Email every signup by hand and start a conversation.
- A landing page measures behaviour, not opinions.
Open
buffer.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
Freemium
Intermediate
Why we picked it
A tactical follow-on covering the channels and motions top B2B startups scale after the first ten. Grounds distribution strategy in real company examples.
From
Lenny's Newsletter
by Lenny Rachitsky
~15 min read
- Content/SEO is a surprisingly dominant B2B channel (Vanta, Amplitude, Figma, HubSpot).
- The core B2B channels: self-serve inbound, sales-assist inbound, outbound, content, paid, partnerships.
- Pick and systematize the one channel that compounds for you.
- Distribution strategy should follow evidence, not fashion.
Open
lennysnewsletter.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 breakdown of how Superhuman turned a waitlist into a filter using onboarding calls, surveys, and referral gating, so joining actually cost people effort. It is a concrete model of the friction our short answer recommends. Read it to see what a waitlist that proves intent looks like in practice.
From
Waitlister
- Friction (calls, surveys, referrals) separates curious from committed.
- Referral gating makes access something people earn.
- Design the join step to demand effort, not just an email.
Open
waitlister.me →
✍️ Essay
✓ Link checked
Free
Intermediate
Why we picked it
This is the most concrete walkthrough of how to test a niche when you have nothing built yet: put up a page describing the offer and count who actually clicks or signs up. It treats a click as a behavior, not an opinion, which is exactly the difference between real demand and polite interest. It gives you the seven steps, rough benchmarks, and the ethics of an honest reveal page, so you can run it this week for almost no money.
From
kromatic.com
by Kromatic (The Real Startup Book)
~15 min read
- A click or an email is a behavioral signal, worth far more than someone saying they like the idea
- Set your success threshold and sample size before you start, so you cannot rationalize a weak result
- Be honest on the reveal page ("coming soon, join the list") so the test does not burn trust in your own niche
Open
kromatic.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 →
Why we picked it
This is the founder essay that made the case for validating before you build, from the person who did it with Buffer. Gascoigne frames the no-code or landing page MVP not as a shortcut to a product, but as a way to learn whether anyone actually wants the thing, which is exactly the stance this question takes. His honest point is that 120 signups plus real conversations taught him more than any polished build would have.
From
Medium (Joel Gascoigne, co-founder of Buffer)
by Joel Gascoigne
- The goal of a no-code or landing page MVP is validated learning, not vanity signups: talk to the people who respond, do not just count emails.
- Anything can be your MVP as long as you are genuinely testing demand before committing to a full build.
- Buffer got only 120 signups in seven weeks, but the direct conversations proved real interest and led to paying customers at launch.
Open
medium.com →
