Ably

Real-time messaging infrastructure at internet scale.

Ably is an enterprise-grade real-time platform-as-a-service that delivers pub/sub messaging, presence detection, and push notifications at global scale. Its edge network spans 30+ data centers with automatic failure recovery and sub-65ms latency delivery to billions of end-user devices. Ably guarantees message ordering and exactly-once delivery semantics, with durable message history for disconnected clients that rejoin. The platform supports 25+ client SDKs across browser, mobile, server, and IoT platforms. Built-in integrations with Kafka, Kinesis, MQTT, and serverless platforms make it a universal messaging layer for event-driven architectures. Connection state recovery ensures seamless resumption after network interruptions without losing messages. Ably powers real-time features for HubSpot, Toyota, and the Australian Open.