MAU (Monthly Active Users) is the number of unique users who engage with an app or website over a one-month period. It is a headline measure of an app's overall audience size, the figure teams cite when they describe how big the product is. Because it counts each user once regardless of how often they return, MAU captures breadth rather than depth of use.

Why MAU matters

MAU shows the breadth of your active audience over time and is widely used to size an app's reach and track long-term growth. It smooths out the daily noise that DAU carries, so it is well suited to reporting trends across quarters and to giving partners or investors a sense of scale.

What counts as active

A user is counted once in MAU if they take a qualifying action at least once in the month, typically opening the app or completing a session. The exact definition is yours to set, but it must stay consistent, because quietly loosening what counts as active inflates MAU without adding real audience. Deduplication matters too: the same person on two devices should not count twice, or your MAU will drift higher than your true audience. Rolling 30-day windows and fixed calendar months can also produce different figures, so pick one and report it the same way each time.

DAU, WAU, and MAU together

Reading DAU, WAU, and MAU side by side reveals how habitual usage is. A high DAU/MAU ratio means users come back often, not just once a month. That ratio, often called stickiness, tells you whether your monthly audience is a base of regulars or a crowd that visits once and disappears. MAU alone can look healthy while the ratio quietly reveals a retention problem. A product with ten million monthly users but a low stickiness ratio is really a product most people try once, and reading the two numbers together is what surfaces that before it shows up in revenue.

MAU vs. DAU

DAU counts unique users in a single day and reacts quickly to launches, events, and outages. MAU counts unique users across a month and moves slowly. Neither replaces the other: DAU is the day-to-day pulse, MAU is the scale, and dividing one by the other is where the insight about habit lives.

MAU and monetization scale

A large MAU is a large monetization surface. Surfacing an offerwall to that monthly audience gives more users a chance to complete offers and generate revenue, turning reach into earnings. Because much of any MAU never makes a direct purchase, a reward-based channel is often the most effective way to monetize the wider audience rather than only the paying core. The same logic explains why growing MAU without a plan to monetize the non-paying majority tends to raise costs faster than revenue.

Common mistakes to avoid

• Treating MAU as a revenue metric. It measures audience size, not what that audience is worth.

• Changing the definition of active, which makes month-to-month comparisons meaningless.

• Reading MAU without the DAU/MAU ratio, which hides whether users are actually sticking.