Ably

Ably is the definitive realtime experience platform, powering more WebSocket connections than any other pub/sub platform. Trusted by companies like HubSpot, NASCAR, and Webflow, Ably serves over 2 billion devices monthly across 80 countries, delivering 6.5ms global message delivery latency and a 99.999% SLA with six years of 100% uptime. Founded in 2015 by Matthew O'Riordan and Dr. Paddy Byers, Ably provides composable realtime infrastructure through simple APIs and SDKs covering 22+ languages and platforms. Its product suite spans Pub/Sub messaging, Ably Chat, LiveSync (database-to-frontend sync), Spaces (collaborative presence), and an AI Transport layer for agentic AI workloads — all backed by 700+ points of presence and 11 globally distributed regions. Ably has raised $78 million to date including a $70M Series B led by Insight Partners and Dawn Capital.