Cohort Analysis

Category: Growth & Engagement · Level: Mid · Also called: Cohort retention

TL;DR

Grouping users by sign-up period and tracking each group's behavior over time to spot trends invisible in aggregate metrics.

Cohort analysis groups users by a shared starting attribute — usually sign-up month — and tracks their behavior across subsequent periods. By viewing each cohort as its own line, teams can see whether retention, monetization, and engagement are improving or degrading over time.

Cohort tables (the famous triangular grid) are the standard format. Reading them well is a senior skill: you're looking at three things at once — within-cohort decay, cross-cohort trends, and seasonality.

Worked example

A SaaS cuts retention by acquisition month: the March cohort retains 78% at month 6, but the August cohort only 54%. Investigation reveals August coincided with a price hike and weakened onboarding — pricing rolls back and August cohort recovers to 71% by month 9.

Common pitfalls

  • Looking only at the most recent cohort and missing structural trends.
  • Mixing cohorts with very different acquisition mixes.
  • Comparing aggregate retention across periods instead of cohort retention.

When this shows up in a pitch deck

Investor-grade Traction slides include a cohort retention chart or table, not just total user growth.

Related terms

  • Retention Curve — A chart showing what fraction of a cohort is still active week-by-week or month-by-month after sign-up.
  • North Star Metric — The single metric that best captures the core value the product delivers and the long-term success of the business.
  • Logo Churn — The percentage of customers (logos) who cancel in a given period, regardless of how much revenue they represented.
  • Net Revenue Retention — The percentage of recurring revenue retained from a cohort after one year, including expansion, contraction, and churn.
  • Product-Market Fit — The point at which a product satisfies a market well enough that demand pulls the company forward instead of the team pushing it.

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