Frameworks

Four ways to organize your metrics. Each framework answers a different question about what to measure and why.

AARRR (Pirate Metrics)

Dave McClure, 500 Startups (2007)

Maps the full user journey from first touch to advocacy. The most widely adopted framework for growth-stage startups because it forces you to measure every stage of the funnel, not just the top.

Acquisition

How do users find you?

Daily Active UsersSessions Per UserConversion RateFeature Adoption RateCustomer Acquisition CostGrowth Accounting

Activation

Do users have a great first experience?

Activation RateTime-to-ValueTrial-to-Paid Conversion RateProduct-Qualified Leads

Retention

Do users come back?

Day 1/7/30 RetentionCohort Retention CurvesCustomer Churn RateCustomer Retention RateDAU/MAU Ratio (Stickiness)Customer Effort ScoreCustomer Satisfaction Rate

Revenue

Can you monetize?

Monthly Recurring RevenueAverage Revenue Per UserLifetime ValueNet Revenue RetentionLTV:CAC RatioCAC Payback PeriodQuick Ratio (SaaS)

Referral

Do users tell others?

Net Promoter ScoreProduct-Market Fit Score
Best for: Growth-stage startups, product teams building their first metrics stack, and anyone who needs a comprehensive view of the user journey from acquisition to advocacy.
Limitations: Linear funnel assumption breaks down for products with non-linear journeys (marketplaces, platforms). Doesn’t explicitly address engagement depth or user happiness beyond NPS.

HEART

Kerry Rodden, Google (2010)

Measures user experience quality across five dimensions. Designed for UX teams who need to quantify subjective experience, not just business outcomes.

Happiness

User attitudes and satisfaction

Net Promoter ScoreCustomer Satisfaction Rate

Engagement

Depth and frequency of interaction

Daily Active UsersSessions Per UserDAU/MAU Ratio (Stickiness)

Adoption

New users and feature uptake

Activation RateFeature Adoption Rate

Retention

Users who keep coming back

Day 1/7/30 RetentionCohort Retention CurvesCustomer Churn Rate

Task Success

Efficiency and completion of user goals

Customer Effort ScoreTime-to-Value
Best for: UX-driven teams, design organizations, and products where user experience quality is the primary competitive advantage. Works well alongside business metrics frameworks.
Limitations: Less prescriptive about business outcomes (revenue, unit economics). Requires careful signal/metric definition per dimension—the framework provides categories, not specific metrics.

North Star Metric

Sean Ellis / Growth Hacking movement (2010s)

One metric that captures core customer value. Forces alignment across the entire organization on what matters most, with 3–5 input metrics that directly influence it.

Attention Game

Time spent in product (Netflix: median view hours, Spotify: time listening)

Daily Active UsersSessions Per UserDAU/MAU Ratio (Stickiness)

Transaction Game

Number of transactions (Airbnb: nights booked, Amazon: purchases)

Conversion RateMonthly Recurring RevenueAverage Revenue Per User

Productivity Game

Efficiency of work (Slack: messages sent, Asana: tasks completed)

Activation RateFeature Adoption RateCustomer Effort Score
Best for: Growth-stage and mature companies that need cross-functional alignment. Especially powerful when teams are pulling in different directions or optimizing local metrics at the expense of the whole.
Limitations: Choosing the wrong North Star can misalign the entire company. About 50% of growth-stage companies default to revenue, but companies like Airbnb and Netflix explicitly avoid it—arguing revenue as NSM leads to suboptimal product decisions.

OKRs (Objectives & Key Results)

Andy Grove, Intel (1970s); popularized by John Doerr at Google

Goal-setting framework that connects aspirational objectives to measurable results. Not a metrics framework per se, but the most common system for operationalizing metrics into team goals.

Objectives

Qualitative, inspirational goals that set direction

Key Results (Acquisition)

Measurable outcomes for user growth

Customer Acquisition CostConversion RateGrowth Accounting

Key Results (Engagement)

Measurable outcomes for product usage

Activation RateDay 1/7/30 RetentionDAU/MAU Ratio (Stickiness)

Key Results (Revenue)

Measurable outcomes for monetization

Net Revenue RetentionLTV:CAC RatioQuick Ratio (SaaS)
Best for: Organizations of any size that need to translate strategy into measurable execution. Works as a wrapper around any metrics framework—pair with AARRR or HEART to populate Key Results.
Limitations: OKRs are a goal system, not a measurement system. Without a metrics framework underneath, teams often pick arbitrary Key Results. Quarterly cadence can also create perverse incentives to hit short-term targets.