Customer success — the work that protects what you sold

Activation = the new customer reaches the moment of first value. They saw the dashboard, sent the first invoice, ran the first report. Most products have an activation rate well below 30% — meaning 7 out of 10 signups never see the thing you sold.

Retention = the customer keeps coming back week after week. Most SaaS retention curves look like a steep drop in week 1, a smaller drop through week 4, then (if you have PMF) a plateau. The plateau number is your real retention — if the curve never flattens, you don't have PMF in this segment.

Diagnostics:

• If activation is broken, fix onboarding before doing anything else. Watch 5 new users go through signup live. Most of the leak is in three or four specific UX moments.
• If retention is broken, diagnose by cohort. The customers who churned at month 2 are telling you something different from the customers who churned at month 6.

Common mistake: investing in retention features before fixing the activation hole. The customers leaking out of the bucket need to land safely inside it before you worry about why some leave later.

The 40% test (Sean Ellis): Survey current customers — "How would you feel if you could no longer use this product?" Options: very disappointed / somewhat disappointed / not disappointed. If ≥40% answer "very disappointed," you have product-market fit signal in that segment. Below 40% and the product isn't load-bearing yet.

Churn diagnostics — every churn has a root cause. Categorise:

• Bad fit (sales sold them the wrong thing) — fix qualification at the top
• Failed activation (never saw value) — fix onboarding
• Champion left (the person who bought is gone) — multi-thread your accounts
• Replaced (competitor or in-house build) — feature gap or pricing gap
• Budget cuts (broader macro) — protect with annual contracts

Quarterly review of your last 20 churns surfaces patterns faster than any survey.

NPS reality check — Net Promoter Score correlates with growth for some products (consumer-y, brand-loyal) and is noise for others (B2B tools with no choice). Track it consistently for trend, but don't manage to the number. The qualitative answers to "why?" are where the value lives.

Net Revenue Retention (NRR) over 100% means existing customers, on net, pay you more this year than last — after factoring in upgrades, downgrades, and churn. The very best SaaS companies hit 120-140% NRR; healthy ones run 105-115%. Below 100% and you're growing despite your customers, not because of them.

How expansion works in practice:

• Seat-based — the product spreads naturally inside the buying company (Slack, Notion, Figma)
• Usage-based — pricing scales with success (Stripe, Twilio, Vercel)
• Tier upgrades — customers outgrow the smaller plan and self-upgrade (most SaaS)
• Cross-sell — a second product to the same customer (HubSpot, Atlassian)

Whichever model you choose, the engine has to feel like a natural progression of value, not an upsell. Customers should be asking how to expand; if you have to push, the value isn't there yet.

A practical activation/expansion ratio: aim for 70-80% of new customers to activate within 30 days, and 30-40% of customers to be on a different (usually larger) plan than they started on within 12 months.