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The Perennus Letter

Lifecycle intelligence for operators who take retention seriously.

Every Tuesday: teardowns of real lifecycle systems, automation architectures you can steal, and operator-level insights you can't Google. Free.

Every Tuesday. Free. Unsubscribe anytime.

Every edition

Not tips. Not hacks. Infrastructure-level thinking.

Every edition is built for people who run the post-signup revenue layer — the part of the funnel most teams build but never watch.

Teardowns

How companies actually engineer retention

Deep behavioral autopsies of companies like Notion, Canva, and Duolingo. Real email captures, trigger logic mapping, and what you can take from their architecture.

System Architecture

Blueprints you can steal

Trigger logic patterns, data property design, scan frameworks. The infrastructure behind always-on lifecycle systems — laid out so you can rebuild it yourself.

Operator Insights

What broke, what we fixed, the math

Anonymized findings from real Perennus scans and consulting engagements. What the leak was, what it was costing, and how it was fixed — with the revenue math.

When you subscribe

You also get a free 3-day email course.

Before the weekly letter starts, you'll receive a focused course on the retention truths most subscription businesses never see.

Day 1

Why blended LTV:CAC hides cohort-level bleeding

The number your board sees is an average. Averages hide the cohorts quietly draining cash.

Day 2

The 3 backend triggers that stop retention decay

Most teams treat retention as a campaign problem. It's an infrastructure problem.

Day 3

Your Retention Debt score + the 90-Day Blueprint

A framework for scoring your own retention infrastructure — plus the full PDF with every playbook behind our results.

Includes PDF

The revenue layer most teams ignore is the one that compounds.

Teardowns. Architectures. Operator-level insights. Every Tuesday.