Stream Chat and Activity Feeds API

Stream is a hosted API platform that provides scalable chat messaging and activity feed infrastructure for mobile and web applications. Founded in 2015 by Tommaso Barbugli and Thierry Schellenbach (CEO), Stream is headquartered in Boulder, Colorado, with offices in Amsterdam, Netherlands. The company has raised over $76 million from investors including GGV Capital, Softbank, and Felicis Ventures. Stream serves over 1 billion end users across customers including CBS, NBC Sports, IBM, Adobe, and Bison. Key products: Stream Chat: a fully featured chat API and SDK for building in-app messaging. Features include channels (public, private, group), threaded replies, message reactions, typing indicators, read receipts, message editing and deletion, file attachments, link previews, emoji, Giphy integration, @mentions, profanity filtering, and message search. Stream Feeds: activity feed API for building social feed experiences similar to Twitter, Instagram, or Facebook feeds. Supports flat feeds, aggregated feeds, and notification feeds with ranking algorithms, follow/unfollow relationships, and real-time updates. Key features: SDKs: native SDKs for iOS (Swift), Android (Kotlin/Java), React Native, Flutter, JavaScript/TypeScript, React, Vue, Angular, and Unity. UI components: fully customizable, open-source UI component libraries that handle complex messaging UI out of the box. Or build fully custom UIs using the API. Scalability: designed to handle billions of messages and millions of concurrent connections. Multi-region, high-availability infrastructure. Moderation: built-in content moderation with profanity filtering, image moderation, and integration with AWS Rekognition and Perspective API. AI: AI-powered chatbots and moderation assistants. Go/React/TypeScript. Proprietary.