Synapse

Synapse is a reference Matrix homeserver implementation used to run a Matrix server for real-time communication. It provides user accounts, rooms, and federation so your server can communicate with other Matrix servers while supporting a wide ecosystem of clients (for example, Element).

Key Features

• Implements the Matrix Client-Server API for messaging, rooms, profiles, and device sessions
• Federation via the Matrix Server-Server API to communicate with other Matrix homeservers
• End-to-end encryption support (handled by clients) with server-side key management endpoints and device tracking
• Extensible integrations via Application Services (e.g., bridges/bots) and webhooks-like push mechanisms
• Admin and moderation capabilities (user management, room management, server configuration controls)
• Storage backends centered on PostgreSQL with caching to support large deployments

Use Cases

• Host a private or public Matrix server for team/community chat using clients like Element
• Build federated messaging services that interoperate with the wider Matrix network
• Connect external networks (e.g., IRC/Slack-like ecosystems) via bridges using Matrix application services

Limitations and Considerations

• Operational complexity increases for large federated deployments (tuning PostgreSQL, caching, workers)
• E2EE is primarily client-driven; server configuration must be aligned with chosen client and key policies

Synapse is widely deployed and serves as a core building block of the Matrix ecosystem. It is a strong choice when you need standards-based federation, broad client compatibility, and a mature server implementation.