Retention Rate
The percentage of users or customers who continue using a product over a given time period.
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Definition
Retention rate measures the percentage of users or customers who continue using a product over a defined time period. It is the inverse of churn and one of the strongest indicators of product value and product-market fit.
Retention is typically measured at multiple intervals: Day 1, Day 7, Day 30, and Day 90 for consumer apps; monthly and annual for SaaS. The retention curve shows how engagement decays over time — products with PMF show curves that flatten (stabilize) rather than declining to zero.
Good retention rates vary by product type: SaaS (85-95% annual), consumer apps (25% Day 1, 10-15% Day 30), and mobile games (30% Day 1, 5-10% Day 30). Retention above industry average is a strong signal of product-market fit.
Why It Matters for Founders
Retention is the most important growth metric because it determines the sustainable size of your user base. High acquisition with low retention is like filling a leaky bucket — you can grow temporarily but never build a large, engaged user base.
For founders, retention data reveals the truth about product value. Users who return are getting genuine value; users who leave are not. Improving retention is almost always more impactful than improving acquisition because it compounds — retained users contribute to LTV, word-of-mouth, and network effects.
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Formula
Retention Rate = (Users at end of period - New users during period) / Users at start of period × 100%Real-World Example
An app starts the month with 10,000 users, gains 2,000 new users, and ends with 9,500. Retention = (9,500 - 2,000) / 10,000 = 75%.
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