Lenny's Podcast: Product | Career | Growth

The original growth hacker reveals his secrets | Sean Ellis (author of “Hacking Growth”)

September 5, 2024

AI Summary

5 min read

Sean Ellis, pioneer of growth hacking and author of Hacking Growth, explains how to gauge product-market fit and scale sustainably. Drawing from his work at Dropbox, LogMeIn, Eventbrite, and others, he emphasizes the Sean Ellis test as a leading indicator, then outlines steps to boost activation, engagement, and acquisition once fit is confirmed.

Gauging product-market fit

The Sean Ellis test asks recent active users (those who've used the product 2+ times in the last 1-2 weeks): "How would you feel if you could no longer use this product?" Options are very disappointed, somewhat disappointed, or not disappointed. Aim for 40% "very disappointed" as a threshold signaling enough must-have users to pursue growth—this emerged empirically from surveying many startups, where higher scores predicted success and lower ones failure. It's a quick qualitative filter before retention data matures, but true fit shows in ongoing cohorts. Sample at least 30 responses from engaged users; avoid one-off products like movies or workshops where it doesn't apply. False positives are rare if users have invested (e.g., built sites on webs.com, scoring 90% despite commoditization), but dig into why via follow-ups like primary benefit and "Why is that important?"

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What you'll learn

1 `* (02:27) **Sean Ellis Test for Product-Market Fit**`
2 `* (07:01) **History and Evolution of 40% Threshold**`
3 `* (09:08) **Lookout Case: Boosting PMF from 7% to 40% in 2 Weeks**`
4 `* (14:30) **Drilling into Must-Have Users for Insights**`
5 `* (22:22) **Survey Timing, Limitations, and Low-Score Fixes**`
6 `* (45:50) **Growth Strategy: Prioritize Activation Before Acquisition**`
7 `* (54:37) **LogMeIn Case: 20x Activation Lift Unlocked $1M/mo Channels**`

+ Full timestamped outline available in the app

Show Notes

Sean Ellis is one of the earliest and most influential thinkers and operators in growth. He coined the term “growth hacking,” invented the ICE prioritization framework, was one of the earliest people to use freemium as a growth lever, and, most famously, developed the Sean Ellis Test for product-market fit (which a large percentage of founders use today to track if they’ve found PMF). Over the course of his career, Sean was head of growth at Dropbox and Eventbrite; helped companies like Microsoft and Nubank refine their growth strategy; was on the founding team of LogMeIn, which sold for over $4 billion; and is the author of one of the most popular growth books of all time, Hacking Growth, which has sold over 750,000 copies. In our conversation, he shares:

• The proper use of the Sean Ellis Test for measuring product-market fit

• How to increase your activation and retention rates

• How to select the right North Star metric for your business

• Case studies from his work growing Dropbox and other products

• How growth strategy has changed over the past decade

• How AI is impacting growth efforts

• Much more

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