Powerful Features for Real-time Apps

Everything you need to build scalable, reliable real-time applications. From pub/sub messaging to presence tracking and beyond.

Real-time Pub/Sub Messaging

Topic-based publish-subscribe messaging built on WebSocket connections. Messages are delivered in milliseconds with automatic reconnection and message queuing.

  • Topic-based routing with wildcards
  • Automatic reconnection handling
  • Message queuing for offline clients
  • Binary and JSON message support

Presence Tracking

Know who's online in real-time. Track user presence across your entire application with automatic join/leave events.

  • Real-time online/offline status
  • Per-topic presence lists
  • Custom presence metadata
  • Presence change callbacks

Quality of Service (QoS)

Choose the right delivery guarantee for your use case. From fire-and-forget to exactly-once delivery.

  • QoS 0: At-most-once (fire and forget)
  • QoS 1: At-least-once (acknowledged)
  • QoS 2: Exactly-once (transactional)
  • Per-message QoS configuration

Access Control (ACL)

Fine-grained permissions for every topic. Control who can publish, subscribe, and manage topics with role-based access.

  • Per-topic read/write permissions
  • Role-based access control
  • Actor-level authentication
  • API key scoping

Rooms & Namespaces

Organize your topics into logical rooms. Isolate conversations, games, or sessions with automatic namespace management.

  • Logical topic grouping
  • Room-level presence tracking
  • Automatic cleanup on disconnect
  • Cross-room messaging

Blueprints

Pre-built application templates for common real-time use cases. Get started in minutes with production-ready code.

  • Chat application blueprint
  • Notification system blueprint
  • Vehicle tracking blueprint
  • Custom blueprint creation

Webhooks

Integrate with external systems using hydration and trigger webhooks. Pre-populate state on subscribe and react to published messages.

  • Hydration webhooks for initial state
  • Trigger webhooks for external integrations
  • Dead Letter Queue for failed requests
  • Custom headers and authentication

WebRTC Video & Audio

Build peer-to-peer video and audio applications using NoLag as the signaling server. Perfect negotiation pattern handles connection setup automatically.

  • Peer-to-peer video and audio calls
  • Automatic peer discovery via presence
  • Perfect negotiation for glare-free connections
  • Built-in ICE candidate exchange

Message Logging & Replay

Persist messages for debugging, auditing, and reliable delivery. Automatically replay missed messages when clients reconnect.

  • Configurable per-topic logging
  • Message history for debugging
  • Automatic replay on reconnect
  • Configurable retention periods

Lobbies

Observe presence across multiple rooms simultaneously. Perfect for dashboards, admin panels, and monitoring applications.

  • Multi-room presence observation
  • Dashboard and ops center views
  • Real-time status aggregation
  • Up to 10 lobbies per room

Usage Analytics

Track connections, messages, and bandwidth in real-time. Monitor your application health with detailed usage metrics.

  • Real-time connection metrics
  • Daily message aggregates
  • Bandwidth tracking
  • Per-app usage breakdowns

Built for Production

Enterprise-grade infrastructure with the developer experience you deserve.

MessagePack Protocol

Efficient binary serialization for minimal bandwidth usage and fast parsing.

Multi-Region

Deploy closer to your users with edge locations worldwide.

Auto-Reconnection

Automatic reconnection with exponential backoff and message replay.

Analytics Dashboard

Real-time metrics, connection stats, and message throughput monitoring.

TypeScript First

Full TypeScript support with typed events and autocomplete.

Scalable Infrastructure

Built on Erlang/OTP for fault-tolerant, distributed messaging.

See it in action

Try our interactive playground or dive into the documentation.

Start Building Read Documentation