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Gravity comes bundled with everything you need to start sending push notifications - saving you hours of headache.
Users who sign into your app for the first time will be prompted to enable push notifications. If they accept, a push token is stored on the server for that user.
Gravity supports multiple devices per user.
Expo has a push notification service to send notifications immediately without any additional setup. However, you can also incorporate Firebase into your app and send push notifications with Firebase instead if you prefer.