✍️ Essay
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Free
Intermediate
Why we picked it
The real signal of product market fit is not a headline retention number, it is whether your cohort retention curve stops falling and flattens into a stable base of users who keep coming back. Andrew Chen is the canonical voice on this mental model, and he pairs the flattening curve with the power user smile so you can see where your sticky core actually lives. Read it as the frame for judging your own numbers, not as a pass/fail line.
From
andrewchen.com
by Andrew Chen
Short read (tweetstorm plus commentary)
- A retention curve that flattens (instead of trending to zero) is the honest sign that some users are genuinely hooked.
- The power user smile shows a concentrated core of engaged users that you can grow out from, so look at the shape, not just the average.
- These are directional signals of product market fit, useful as a starting point rather than a strict benchmark to clear.
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📄 Article
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Free
Beginner
Why we picked it
Once you know your curve should flatten, the next question is where it should flatten, and this piece answers it with concrete benchmark ranges by business type instead of hand-waving. Lenny pooled numbers from 20-plus growth leaders and investors, so you can put your own 6-month retention next to a real bar for your category. Treat the ranges as a starting point for judgment, not a pass-fail line, since a consumer social product and an enterprise SaaS live in completely different worlds.
From
Lenny's Newsletter
by Lenny Rachitsky
~10 min read
- The bar is category-specific: roughly 25% good / 45% great for consumer social, 40% / 70% for consumer subscription, and 70% / 90% for enterprise SaaS at 6 months.
- Judge yourself against your own business type, not a global average. Comparing a marketplace to a SaaS number will just mislead you.
- It also splits user retention from net revenue retention, a useful reminder that a subscription business can look flat on users while still growing revenue per account.
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lennysnewsletter.com →