Notifications

Pushover API

Simple push notification service for sending real-time alerts to iOS and Android devices via a dead-simple REST API with minimal setup.

Expo Push Notifications API

Expo's push notification service that abstracts FCM and APNs into a single API, enabling cross-platform push notifications for React Native apps built with Expo.

Firebase Cloud Messaging (FCM)

Google's Firebase Cloud Messaging service for sending free push notifications to Android, iOS, and web apps at massive scale with reliable delivery.

OneSignal API

Multi-channel customer engagement platform enabling push notifications, email, SMS, and in-app messages via a unified API with advanced segmentation and A/B testing.