DAU (Daily Active Users) is the number of unique users who actually use a service in a single day. It counts distinct users, excluding duplicate sessions, and is a core metric for daily activity and engagement. For apps and platform services, it is the first benchmark for gauging growth and overall health.
What DAU Measures
DAU is based on "active" behavior, not simple visits. Each service must clearly define what counts as active: login, content consumption, core feature usage, and so on.
- Consistent definition: If the active criteria shift, trend comparisons become meaningless.
- Unique users: Repeat sessions from the same user count as one.
- Trend over absolute value: The daily change pattern matters more than a single number.
Relationship with MAU: Stickiness
Monthly Active Users (MAU) measures over a month, while DAU measures over a day. Viewing both together shows how often users return.
DAU ÷ MAU = Stickiness
The higher this ratio, the more frequently users return. Generally, 20% or above is good, and above 50% indicates very strong loyalty. Messengers and social platforms run high; occasional-use utility services run low.
| Metric | Period | Primary Use |
|---|---|---|
| DAU | 1 day | Daily activity and engagement |
| MAU | 30 days | Total user base |
| Stickiness | DAU/MAU | Return rate and loyalty |
Balancing Growth and Retention
DAU is the sum of new acquisitions and existing retention. Even if you spend on CAC to add new users, weak retention leaves DAU stagnant. From an LTV perspective, growing returning users is more efficient.
Users acquired through search and generative channels also feed directly into DAU. Securing stable organic traffic with SEO and GEO builds a solid DAU base while reducing ad dependence.
Notes
DAU can spike temporarily from one-off campaigns, but it drops quickly without retention to sustain it. Manage both new acquisition and existing user retention to grow in a healthy way.