Nº 02AI & Data

Cohort retention is the only metric that matters

MRR is a number. ARR is a number. NRR is a number. None of them tell you whether your business is alive. Here's the only chart you should look at every Monday morning.

RevTune Team

Pricing intelligence

February 8, 20266 min read

If you could only look at one chart every Monday morning, it should be cohort retention.

Not MRR. Not ARR. Not NRR. Cohort retention by sign-up month.

Why

MRR is a snapshot. It tells you what the business looks like today. It doesn't tell you whether today's customers will be there next month. Your MRR can grow for a year while the underlying business is dying — you just have to acquire faster than you bleed.

ARR is just MRR × 12. Same problem.

NRR is closer, but it's an average. It hides the fact that your best cohort might be retaining at 95% while your worst is retaining at 40%. The average says everything is fine. The cohort chart shows the rot.

What to look for

A healthy SaaS cohort chart shows three things:

The first-month drop — almost everyone loses 20-40% in month one. That's normal. If yours is 60%, your activation is broken, not your pricing.
The flattening point — at some point the curve flattens. The customers who survived past that point are your real customers. If it never flattens, you have no retention.
The expansion bend — the gold standard. If your cohort lines start curving back up after month 12, your customers are expanding their usage faster than they're churning. That's a 100%+ NRR business, and it's the only kind worth running.

How to read it weekly

Ignore the absolute numbers. Compare the most recent cohort to the one from 3 months ago, at the same age. Is it better, worse, or flat? That's the answer to "are we improving?"

Everything else is noise.

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Why

ARR is just MRR × 12. Same problem.

What to look for

A healthy SaaS cohort chart shows three things:

The first-month drop — almost everyone loses 20-40% in month one. That's normal. If yours is 60%, your activation is broken, not your pricing.

The flattening point — at some point the curve flattens. The customers who survived past that point are your real customers. If it never flattens, you have no retention.

The expansion bend — the gold standard. If your cohort lines start curving back up after month 12, your customers are expanding their usage faster than they're churning. That's a 100%+ NRR business, and it's the only kind worth running.