Pirate metrics (AARRR)

AARRR, the pirate metrics, is a five-stage framework for the customer lifecycle: Acquisition (they find you), Activation (their first good experience), Retention (they keep coming back), Referral (they tell others) and Revenue (they pay). Coined by Dave McClure, it's pronounced like a pirate's growl, hence the name.

The value for a lean founder is focus. Rather than drowning in vanity numbers, you track one metric per stage and find the leakiest one, the single biggest drop-off between steps. Fixing the worst leak usually beats chasing more traffic into a bucket with holes. Pouring acquisition into a product nobody activates just wastes money faster.

The useful trick is that each stage has its own tooling, so you can actually instrument it. Say you're running cold outreach with Instantly to drive Acquisition: you watch reply and booked-call rates, not raw sends. For Activation, say you're tracking the first session with Hotjar, you watch where new signups rage-click or bail before their first win. For Retention and Revenue, say you're running a lifecycle email programme in Brevo, you watch whether onboarding and win-back sequences actually pull people back rather than just opens.

The sequence also implies an order of operations: there's little point optimising acquisition before activation and retention work, because you'll spend to fill a leaky funnel. Map your own AARRR with real numbers, then fix the stages from the bottom of the funnel up. Note this is distinct from 'pirate metrics' as a generic term, AARRR names the specific five-stage model.