Frameworks
AARRR (Pirate Metrics)
McClure's five startup metric stages: Acquisition, Activation, Retention, Referral, Revenue.
Complete guideGrowth Hacking
Ellis's term for rapid, cross-functional experimentation whose only true north is scalable growth.
Complete guideGrowth Loops
Reforge's model replacing funnels: closed systems whose output reinvests as input, compounding growth.
Complete guideNorth Star Metric
The single metric expressing the value customers receive, which the whole team aligns to grow.
Complete guideICE / Experiment Prioritization
Scoring growth ideas on Impact, Confidence, and Ease to sequence a high-velocity testing backlog.
Complete guideAcquisition & Virality
Viral Coefficient (K-factor)
Average new users each existing user generates; above 1.0 the product spreads by itself.
Complete guideReferral Programs
Engineered word of mouth: incentives for users to invite others, powering the referral loop.
Complete guideProduct-Led Growth (PLG)
The go-to-market motion where the product itself (via free use) is the main driver of acquisition and expansion.
Complete guideFreemium & Free Trial Models
Zero-price entry offers that convert usage into paid demand, the fuel of most PLG loops.
Complete guideActivation & Retention
Activation & 'Aha' Moment
Getting new users to first value fast, the step most predictive of long-term retention.
Complete guideRetention Curves & Cohorts
Reading retention by signup cohort to see whether the product truly holds users over time.
Complete guideHabit Formation (Hooked)
Designing trigger–action–reward–investment cycles that turn usage into routine.
Complete guideFlywheel Model
HubSpot's replacement for the funnel: delighted customers become the force that attracts the next ones.
Complete guide