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APNs
Apple Push Notification service (APNs) is the centerpiece of the remote notifications feature. It is a robust, secure, and highly efficient service for app developers to propagate information to iOS (and, indirectly, watchOS), tvOS, and macOS devices. The notification information sent can include badges, sounds, newsstand updates, or custom text alerts.
| First released | 2009 |
| Developed by | Apple |
| Open-source | Yes |
| Used by | Google, Apple, Microsoft |