Monthly Tracked Users

Monthly tracked users (MTU) is the count of unique people who produced at least one event in a month, and in many tools it is the pricing basis; a count of people, not events.

MTU is a different pricing basis from monthly events and creates a different incentive: because it counts people not occurrences, a team is free to track each user deeply without every extra event costing money, but the number of users sets the cost ceiling. There is an important statistical subtlety here: “unique user” is inherently an estimate, because one person on several devices or browsers may be counted as several users and vice versa. So two tools' MTU on one site is rarely exactly equal; the gap usually comes from the definition of a user and the estimation method, not from error. Another trap is confusing MTU with an active user (like MAU); MTU is a billing concept counting anyone with even one visit, while an active user is an analytical concept with an activity threshold.