DAU / WAU / MAU
Daily, weekly and monthly active users: the unique people who actually use the product in a given period, whether or not they pay.
Core MetricsTerm 22 / 81
Formula
Stickiness = DAU ÷ MAU × 100
In practice
The real question is how you define 'active': logging in, or doing something that delivers value? The DAU ÷ MAU ratio shows whether the product creates a habit.