Realtime Messaging Infrastructure

Pusher provides bi-directional hosted messaging APIs that enable developers to build realtime features into web and mobile applications without managing complex WebSocket infrastructure. The platform operates two core products: Channels for pub-sub messaging and Beams for cross-platform push notifications. Channels delivers low-latency event streaming over persistent WebSocket connections, supporting presence detection for online indicators, private channels with authentication endpoints, and client events for direct peer-to-peer messaging within security constraints. Over 40 server SDKs cover languages including Node.js, Python, PHP, Ruby, Go, Java, and ASP.NET, while client libraries target JavaScript, Android, iOS Swift, and iOS Objective-C, ensuring integration regardless of technology stack. Developers trigger events from their backend with a single line of code, and subscribed clients receive updates in milliseconds, powering use cases like live dashboards, stock ticker charts, collaborative editing, in-app chat, multiplayer game state, location tracking, and activity feeds. Beams extends the offering with native push notification delivery to iOS via APNs and Android via FCM, including scheduled delivery, multi-device interest groups, and delivery receipts. As part of the MessageBird family, the infrastructure operates globally distributed server clusters with automatic failover, horizontal scaling, and enterprise-grade SLAs. Notable customers include GoGuardian for classroom monitoring, ServiceTitan for field service dispatch, the Washington Post for live news updates, and Remind for educational messaging, demonstrating the platform reliability across diverse realtime requirements.