Assumption Type
Retention: Will Users Come Back After Day One?
If users don't come back after day 7, you don't have a product. You have a demo.
What is the retention assumption?
Retention is the assumption that users will continue using and paying for your product over time. It's the foundation of every subscription business and the single strongest indicator of product-market fit.
Why founders get this wrong
Founders focus on acquisition metrics (signups, downloads) because they're easier to influence and more satisfying to track. But a leaky bucket never fills. If 90% of users churn in month one, no amount of marketing can build a sustainable business. The founders who win are obsessed with day-1, day-7, and day-30 retention before they think about growth.
Signs you're making this assumption
- You're tracking signups but not tracking how many users come back after day 1, day 7, or day 30
- You know your signup numbers but don't know your churn rate
- Users praise the product in feedback but stop using it within weeks
- Your re-engagement emails have open rates below 10%
- You're adding features to attract new users instead of understanding why current users leave
How to actually test retention
Define your retention event: what action must a user take for you to consider them 'retained'? It's not logging in — it's completing the core value action.
Measure cohort retention: what percentage of users who signed up in week 1 are still active in week 4? In week 12?
Ask churned users directly: 'You stopped using [product] after [X weeks]. What happened?' This is the most valuable data you'll ever collect.
Test the onboarding-to-value path: how quickly does a new user reach the 'aha moment'? Shorten that path relentlessly.
Run a Validue campaign testing how frequently your target users encounter the problem and what keeps them using current solutions long-term.
The one question that exposes this assumption
“Think about an app or tool you stopped using in the last 6 months. What specifically made you stop? What would have made you stay?”
Industries where retention is most dangerous
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