Carillon docsDevice counting
Monthly Reachable Devices: qualifying activity and the billing-period count.
Monthly Reachable Devices (MRD) counts distinct devices over a period of UTC dates. Each qualifying device counts once, regardless of how many notifications it receives.
The definition
A device counts toward a billing period when, within that period, at least one of these happened:
-
It was the recipient of a delivery that reached
sent, accepted by Apple or Google rather than merely attempted. -
It was the source of an open event.
-
It was seen by the SDK while opted in and not invalidated: the registration that happens when your app starts.
The metric is the count of distinct devices over the period itself, not a peak or a rolling window. It does not imply that invoicing is enabled.
The 30-day rolling figure the dashboard shows for trend is a different number: its peak over a month would include devices last touched up to sixty days before the period ended.
Examples
| Activity in the billing period | Counts? |
|---|---|
| Device receives several notifications accepted by the provider | Once |
| Imported token receives no accepted notification, reports no open, and is not seen by the SDK | No |
Imported token receives a notification that reaches sent | Yes |
| Device has only failed deliveries and no other qualifying activity | No |
Two qualifying devices share the same external_id | Two devices |
The SDK registration signal requires the device to be opted in and not invalidated. A failed delivery alone does not qualify a device. Later invalidation does not remove activity that already qualified the device within the period.
Organization usage
Organization usage shows the sum of its app counts over the same period. Pricing adds the app counts together before applying one shared free allowance and base fee to the organization invoice. Devices are not deduplicated between apps. See Pricing for the tariff and billing availability.