Real-time in-app notifications

If you need real-time notification delivery APIs for both mobile and web applications, there are several strong backend services to consider. The best choice depends on whether you want push notifications when an app is closed, instant in-app updates while users are online, or a unified API for multiple notification channels.

The most useful options fall into three categories: dedicated push services, real-time messaging infrastructure, and multi-channel notification platforms.www.courier.com+2

1. Leading notification backend services

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OneSignal

(Best all-around push)

Supports iOS, Android, and web push, with targeting, scheduling, analytics, and campaign management. A good choice if you want to launch quickly without building your own notification infrastructure.

Best for: transactional alerts, engagement, and mobile/web push.

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