How are MTUs calculated by Segment?

MTUs are Monthly Tracked Users

Monthly tracked users are calculated based on the number of unique user_ids plus unique anonymous_ids that appear in any call to Segment in a given month. Object-based sources do not count towards your MTU count.

We only count users once per month, even if they perform multiple actions across your sources.

What about object-based sources?

Object-based Sources (like Salesforce, Zendesk, and Stripe) don’t impact your MTU counts because there are no IDs. However they do impact your overall object count.

And event based cloud-app sources?

Event based (mostly email sources like Klaviyo, Vero, Drip, etc.) do create MTUs because they have IDs associated.

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