Product-market fit, taken apart
Product-market fit, taken apart: teardowns, metrics and playbooks for founders finding what people can’t do without.
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Most teams without fit never decide; they give it another month. This pivot or persevere playbook sets three bars before each cycle, three decision rules, a 60-minute meeting script and a template you can use this week.
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Monthly churn rate is customers lost ÷ customers at the start of the month. This guide works through an example, shows why monthly × 12 is wrong, how to turn churn into lifetime, and how much churn moves by chance at startup sample sizes.
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Airbnb was stuck at about $200 a week until its founders stayed in their own listings and saw the photos were the problem. This startup teardown shows the diagnosis, what they knew then, and a listing gap audit you can run this week.
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YouTube began as a video dating site that could not get one upload, even when the founders offered cash. This startup teardown shows what the pivot changed, what the founders knew then, and a supply ask test you can run this week.
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Your ideal customer profile is the segment whose retention curve flattens highest. A step-by-step method with a worked example, the margin-of-error check, and a four-line ICP template.
Sharpen it
A step-by-step landing page smoke test: one promise, one button, a bar you set before launch, the margin-of-error maths for small samples, and a checklist to run this week.
Run the playbook
DAU/MAU tells you how many days a month a typical user comes back. The formula, a worked example, how to read it for daily and weekly products, the traps, and a SQL query to run this week.
See the numbers
Burbn was a cluttered check-in app; its users kept coming back for one thing, photos. This startup teardown shows what the team knew, what they cut, and a feature pull audit you can run this week.
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A step-by-step concierge MVP playbook: deliver the outcome by hand to five to ten paying customers for two to three weeks, log every step, ask them to renew, and automate only what you repeat. With a decision table and a template.
Run the playbook
Net revenue retention shows whether your existing customers' revenue grows without new sales. The NRR and GRR formulas, a worked example, why the same NRR can hide two different businesses, and the mistakes that inflate it.
See the numbers
A startup teardown of how Dropbox used a rough screencast to find early users: the sceptical Hacker News thread, the Digg video that took the waiting list to 75,000 in a day, what that did and did not prove, and how to run the test yourself.
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A startup teardown of Slack's pivot from the failed game Glitch: how Tiny Speck tested its internal chat tool on ever-bigger friendly teams, what the preview sign-ups did and did not prove, and a rollout plan you can copy.
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