Realtime Limits
Our cluster supports millions of concurrent connections and message throughput for production workloads.
Upgrade your plan to increase your limits. Without a spend cap, or on an Enterprise plan, some limits are still in place to protect budgets. All limits are configurable per project. Contact support if you need your limits increased.
Limits by plan
| Free | Pro | Pro (no spend cap) | Team | Enterprise | |
|---|---|---|---|---|---|
| Concurrent connections | 200 | 500 | 10,000 | 10,000 | 10,000+ |
| Messages per second | 100 | 500 | 2,500 | 2,500 | 2,500+ |
| Channel joins per second | 100 | 500 | 2,500 | 2,500 | 2,500+ |
| Channels per connection | 100 | 100 | 100 | 100 | 100+ |
| Presence keys per object | 10 | 10 | 10 | 10 | 10+ |
| Presence messages per second | 20 | 50 | 1,000 | 1,000 | 1,000+ |
| Broadcast payload size | 256 KB | 3,000 KB | 3,000 KB | 3,000 KB | 3,000+ KB |
| Postgres change payload size (read more) | 1,024 KB | 1,024 KB | 1,024 KB | 1,024 KB | 1,024+ KB |
Beyond the Free and Pro Plan you can customize your limits by contacting support.
Limit errors
When you exceed a limit, errors will appear in the backend logs and client-side messages in the WebSocket connection.
- Logs: check the Realtime logs inside your project Dashboard.
- WebSocket errors: Use your browser's developer tools to find the WebSocket initiation request and view individual messages.
Realtime Inspector
You can use the Realtime Inspector to reproduce an error and share those connection details with Supabase support.
Some limits can cause a Channel join to be refused. Realtime will reply with one of the following WebSocket messages:
too_many_channels
Too many channels currently joined for a single connection.
too_many_connections
Too many total concurrent connections for a project.
too_many_joins
Too many Channel joins per second.
tenant_events
Connections will be disconnected if your project is generating too many messages per second. supabase-js will reconnect automatically when the message throughput decreases below your plan limit. An event is a WebSocket message delivered to, or sent from a client.
Postgres changes payload limit
When this limit is reached, the new and old record payloads only include the fields with a value size of less than or equal to 64 bytes.