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martinkrizan.com / aarrr / behavior-triggered-onboarding-emails

AARRRActivation

Behavior-triggered onboarding emails

Email sequences fired by what a user does (or doesn't do), not by a fixed calendar.

Event-driven email sequences that respond to specific behavior — for example, 'didn't finish initial setup within 24 hours' — instead of sending the same day-1/day-3/day-7 emails to everyone.

Why this ring

Needs solid event-tracking infrastructure in place before it can be deployed reliably.

SaaS fit

Strongest for self-serve SaaS with measurable product events.

How to apply it

When to apply: You have product event tracking (not just pageviews) and an email tool that supports API or webhook triggers.

First steps: Define 3-5 key 'didn't do X within Y hours' triggers, write short action-oriented emails with a single clear CTA, and measure the return action in the product, not just opens and clicks.

Pitfalls: Fixed-schedule sequences (day 1, day 3, day 7 for everyone) that ignore actual behavior end up burying users in irrelevant messages.

Metrics to watch: Return action taken after the email (not just open rate), and the share of users rescued from drop-off.

Resources

Who does it well

  • DuolingoIts notification and email system is built almost entirely around what a user did or skipped, not a fixed drip calendar.
  • NotionSends targeted nudge emails tied to specific unfinished setup steps rather than a generic onboarding drip.