What is Hacking Growth about?

Hacking Growth is Sean Ellis and Morgan Brown's guide to building a growth function — an organizationally distinct, cross-functional team focused on finding and exploiting opportunities to accelerate customer acquisition, retention, and revenue. Ellis coined the term "growth hacker" and led early growth at Dropbox, LogMeIn, and Eventbrite. The book is his comprehensive account of the growth hacking methodology, including how to build the team, what its process should be, and how to apply it to each stage of the customer lifecycle.

The book's core methodology is the Growth Hacking Process: analyze data to identify opportunities, generate ideas for experiments, prioritize by impact and ease, run the experiments, and analyze results to determine what scales or kills the hypothesis. The process is designed to be continuous — the team runs experiments on a regular cadence and uses the accumulation of small wins to produce compounding growth rather than betting on a single large initiative.

Ellis and Brown organize growth opportunities around the customer lifecycle: acquisition (how do customers find you?), activation (how do customers have their first valuable experience?), retention (how do customers keep coming back?), revenue (how do you monetize?), and referral (how do customers bring others?). Each stage has specific metrics and typical leverage points. The AARRR framework (Acquisition, Activation, Retention, Revenue, Referral) is not original to the book — Dave McClure formalized it — but Ellis and Brown provide the most systematic treatment of how to work through each stage systematically.

The North Star Metric is one of the book's most influential ideas: identifying a single metric that best captures whether customers are experiencing the core value of the product. For Airbnb, it was nights booked. For Facebook, it was monthly active users. The North Star guides which experiments to prioritize across all the AARRR stages. The honest limitation: the book is most detailed on acquisition and activation; the retention and revenue sections are somewhat thinner.