Retention is a product problem, not a marketing one. The loop patterns that produce durable retention and how to instrument.
Retention is the multiplier on every other metric. A leaky bucket kills growth no matter how much water you pour in. The fix is almost always in the product, not the campaigns.
Trigger → action → variable reward → investment that increases likelihood of the next trigger. Every retained product has this loop, whether the team designed it consciously or not.
Habit (Duolingo streak). Content (Netflix new episodes). Social (LinkedIn notifications). Workflow (Slack unread messages). Data (Notion accumulated docs). Pick the loop that matches your product's core value.
Weekly / monthly active users per cohort. Session frequency. Time to nth action. Return-visit intervals. Cohort curves flat by month 3 = you have retention. Still decaying = you don't.
Faster time to first value. Better onboarding checkpoints. Notifications tied to real events (not marketing pushes). Removing dead-end flows. Every notification you send should improve retention or come out.
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