What are AARRR (pirate) metrics?
AARRR is a five-stage funnel framework — Acquisition, Activation, Retention, Referral, Revenue — coined by Dave McClure. It gives a startup one metric per stage so problems can be located rather than guessed at. The order matters: fixing acquisition while retention leaks is the classic misuse.
The five stages
Acquisition — how people find you. Measured by traffic and signups by channel, not in aggregate; a blended number hides that one channel works and four don't.
Activation — whether they reach first value. The most commonly skipped stage and usually the most broken.
Retention — whether they come back. The stage that determines whether the other four are worth anything.
Referral — whether they bring others. Dropbox's two-sided storage referral and PayPal's $20 signup bonus are the canonical examples, and both worked because the product was already retaining; a referral programme on a leaky product just distributes disappointment faster.
Revenue — whether they pay. Deliberately last, which is the framework's actual argument.
The order is the insight
Almost every team that "uses AARRR" reads it as a list and works on the first item, because acquisition is the stage you can buy. Uber's city-by-city playbook is often cited as blitzscaled acquisition, but the reason it worked is that the underlying product retained — a rider who got a car in four minutes came back without persuasion. Blitzscaling a product that doesn't retain, as Dunzo eventually demonstrated, converts funding into churn at speed.
Where it breaks down
AARRR assumes a single linear funnel. Marketplaces have two — supply and demand acquire, activate and retain differently, and a marketplace with great demand-side retention and broken supply looks healthy in a blended AARRR dashboard right up until it isn't.
Use it as a diagnostic that tells you where to look, then throw it away and study the specific stage properly. It is a map, not a strategy.
Seen in practice
Case studies where this shows up as a real decision, not a definition.
Related questions
Why is it called pirate metrics?
Because the initials spell AARRR. Dave McClure introduced the framework at a 2007 startup conference and the name stuck, which is most of the reason people still remember the five stages a decade and a half later.
Is AARRR still relevant?
As a diagnostic checklist, yes. As a growth strategy, it has a known weakness: it treats the funnel as linear and one-directional, which fits a transactional product better than a network or marketplace where supply and demand have separate funnels.
What is the difference between AARRR and the RARRA model?
RARRA reorders the same stages to put Retention first, on the argument that acquiring users into a leaky product wastes money. It is less a different framework than a corrective to how AARRR is usually misread.
More on metrics
Last reviewed 2026-09-07