What exactly does "Delivery" statistics mean?
"Delivery" is metric available for Android, Chrome and Firefox platforms only, and it shows the total number of devices that definitely received your push on this platforms.
In order to get the most accurate numbers of the Delivery statistic, we strongly recommend updating Pushwoosh SDK to the latest version. Please refer to our guide for more information on updating our SDK:
Please also note that this stat increments gradually, since some devices may be offline, switched off or experiencing connectivity issues.