P1-03 Lifecycle Email Sequences (Event-Triggered)

Multi-step email sequences triggered by product events.

Scoring Card

Dimension	Score	Rationale
Pain	5/5	Every SaaS needs lifecycle emails; setup is painful and expensive
Revenue	5/5	Automated lifecycle emails generate 320% more revenue than blasts
Build	3/5	Sequence orchestration, template rendering, delivery integration
Moat	4/5	Sequences reactive to ALL module events — not just page visits
Total	17/20

Classification

Painkiller

The Pain It Kills

“Setting up event-triggered emails requires Segment + Customer.io + app events + 2 days of engineering. Every. Single. Time.”

“We pay Customer.io $400/mo and Braze quoted us $60K/yr. All we need is 5 sequences.”

Customer.io costs $100–$1,000/mo. Braze costs $60K/yr.
Setting up event-triggered emails requires stitching together a CDP, an email tool, and app events — 2+ days of engineering per sequence.
Most indie teams settle for blast emails because automation is too expensive and complex.
Automated lifecycle emails generate 320% more revenue than one-time blasts.

What It Does

Sequence builder — trigger event → delay → condition branches → email send.
5 pre-built templates — launch with proven sequences, customize later.
MJML-based templates — responsive email templates with merge tags (e.g. contact.name, contact.referral_link).
SES/Postmark delivery — reliable transactional email delivery.
Open/click tracking — engagement data flows back into the contact record.
Unsubscribe handling — CAN-SPAM compliant, per-sequence and global unsubscribe.

Competition & What We Replace

Tool	Pricing	Limitation
Customer.io	$100–$1,000/mo	Messaging only, no referral/survey/waitlist integration
Mailchimp Automation	$13–$350/mo	Primitive event triggers, no product event support
Braze	$60K/yr	Enterprise pricing, overkill for growth-stage teams
Loops	$49–$499/mo	Email only, no cross-module event triggers

All competitors are messaging-only platforms with no native integration to referral programs, surveys, waitlists, or contact identity resolution.

Moat & Defensibility

Cross-module reactivity is the moat (4/5).

GrowthOS email sequences can react to events from every module — not just page visits or custom events:

Survey response received → trigger follow-up sequence
Referral completed → send reward notification
Waitlist position changed → send update email
NPS score submitted → branch to retention or advocacy sequence

This closed-loop responsiveness is unique. No standalone email tool can react to referral completions or NPS scores without custom integration work.

Interoperability Advantage

What Ships

Sequence builder — event trigger, delay steps, condition branches, send steps
5 pre-built templates:
1. Welcome sequence
2. Onboarding nudge
3. Trial expiry warning
4. Re-engagement
5. Referral prompt
MJML templates with merge tags — responsive, customizable
SES/Postmark delivery integration — bring your own API key
Open/click tracking — engagement metrics per email and per contact
Unsubscribe handling — per-sequence and global, CAN-SPAM compliant
Basic analytics — sent, delivered, opened, clicked, unsubscribed per sequence

What Does NOT Ship

Drag-and-drop visual email builder — Phase 3
Visual journey canvas (multi-branch flow editor) — Phase 3
Send-time optimization (ML-based optimal delivery time) — Phase 4
A/B testing on email variants — Phase 3

Build vs Buy

BUILD — sequence orchestrator via Temporal.io, email renderer, delivery integration.

The orchestration layer is the core differentiator. Temporal.io provides durable execution for multi-step sequences with delays, retries, and condition evaluation. The email renderer and delivery layer are straightforward integrations.

Estimated effort: 5–6 weeks.

Dependencies

Dependency	Why
Contact Graph (P1-01)	Every email is sent to a contact. Merge tags pull from the contact record.
Event Bus	Sequences trigger on events emitted by other modules.