Stream

Stream provides scalable Activity Feed and Chat APIs used by 1.2 billion end users to build real-time social engagement.

Stream delivers high-performance infrastructure for enterprise-grade social features: Activity Feeds, Chat, and Video. By offloading complex backend logic to their specialized API, engineering teams at companies like Adobe, SoundCloud, and Match Group save months of development time. The platform handles the heavy lifting of real-time synchronization and infrastructure scaling (supporting over 5 million concurrent connections per app) while providing frontend SDKs for React, Flutter, and iOS. It is the industry standard for integrating reliable, low-latency social components without the overhead of building from scratch.

https://getstream.io