What is AAARRR? (Pirate Metrics)

AAARRR is a six-step framework for measuring startup growth: Awareness, Acquisition, Activation, Retention, Referral, and Revenue.

How does AAARRR work?

Each letter is a stage in the customer journey. Awareness: people learn you exist. Acquisition: people find you. Activation: they get value fast. Retention: they come back. Referral: they tell friends. Revenue: they pay you.

Pick one metric per stage. Then watch where users drop off.

Why does AAARRR matter?

Vanity metrics feel great and prove nothing. Downloads, page views, and followers don’t pay rent. AAARRR forces you to measure the whole funnel, and the funnel shows you where the leak is.

Where did AAARRR come from?

Investor Dave McClure, who later founded 500 Startups, coined it in a 2007 talk called “Startup Metrics for Pirates.” The name stuck because the acronym sounds like a pirate’s growl. His original acronym was AARRR. The extra A for Awareness came first in this version, because people can’t buy from you if they don’t know you exist.

How do you use AAARRR well?

Find your weakest stage and fix it first. Most early teams pour money into acquisition while retention quietly bleeds out. Patch the leaky bucket before you pay to fill it faster.

Bottom line: growth is a funnel, not a firehose. Measure every stage, then fix the leakiest one first.

For more startup terminology, visit startupdefinitions.com.