Activation rate is the percentage of new sign-ups who complete the key action that signals they have gotten real value from a product, often called the activation or "aha" moment. Each product defines its own milestone, such as sending a first message, adding a first monitored site or inviting a teammate.
Why it matters
Sign-ups alone say little: many people register and never return. Activation sits between acquisition and retention, and users who activate are far more likely to stay and pay. It is a central metric in product-led growth, guiding onboarding design, emails and in-app prompts. The right milestone is usually found by comparing the early behaviour of users who stayed with those who left.
Example
Activation event: add a site and receive the first check result
New sign-ups this week: 600
Reached the event within 7 days: 210
Activation rate = 210 / 600 = 35%Common mistakes
- Choosing a shallow action such as "logged in" that does not predict retention.
- Leaving the time window undefined.
- Optimising the number by making the milestone easier rather than improving the experience.
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