Stream Chat vs. CometChat

Stream Chat is a messaging API and SDK suite for developers building in-app chat. Teams integrate it to ship production messaging in weeks instead of building and maintaining real-time infrastructure in-house. Client SDKs cover React, Swift, Android, Flutter, React Native, Angular, JavaScript, Unity, and Unreal, each with a UI kit you can customize or replace entirely. The backend runs on Go and RocksDB across 12 global edge locations, holding sub-40ms latency and 5M concurrent connections in a single channel behind a 99.999% uptime SLA.

Real-Time Chat, Voice & Video SDK for Product Teams CometChat is a communication platform that lets developers add real-time chat, voice, and video to any app or website. UI kits, SDKs, and APIs for every major framework, plus no-code embeds for teams that need to move without engineering cycles. Moderation, notifications, analytics, and multi-tenant infrastructure are all built in. AI agents deploy on the same platform, inside the same conversations. CometChat powers 113,000+ apps, handles 7M+ messages per day across 163 countries, with a 7ms API response time and 99.999% uptime SLA.