Retention first

Retention compounds. A 10% improvement in retention often outperforms a 50% improvement in acquisition because retained users contribute repeatedly and refer.

The math

If you retain 40% of users after month 1, you need to acquire constantly to grow. If you retain 70%, growth compounds.

Measuring

Cohort retention: what % of users who signed up in month X are active in month X+1, X+3, X+6?

The curve shape

• Declining-then-flattening: sustainable
• Declining-to-zero: product-market-fit problem

Before investing in acquisition

Get retention above benchmark for your category. Then scale acquisition.

What to do with this

• Fix retention before investing in acquisition, pouring leads into a leaky bucket is the most common early-stage marketing failure
• Measure cohort retention (month-1, month-3, month-6), aggregate "MAU" numbers hide the decline that should alarm you
• Target a flattening retention curve (not hitting zero), if it trends to zero, you have a product-market-fit problem not a marketing problem
• Benchmark against your category, 60% month-1 is great for B2C apps but weak for B2B SaaS, know your category's floor
• When retention improves 5-10%, acquisition economics transform, it's usually the highest-ROI investment a growth team can make