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DAU/MAU ratio

Daily active users divided by monthly active users: how often people come back.

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What does DAU/MAU ratio mean?

DAU is the number of unique users active on a given day, and MAU the number active at least once in a month. The DAU/MAU ratio, often called stickiness, shows how many days a month the typical user returns. Example: an app with 3 million DAU and 10 million MAU has a ratio of 30 percent, so the average monthly user is active about 9 days a month. Messaging and social apps tend to score high and travel apps low, so compare with similar products. Companies define "active" differently, which makes comparisons between companies tricky.

Where does it come up in case interview prep?