REALTIME

Realtime, built in

Read the docs Start free with SurrealDB

LIVE SELECT. Any query becomes a realtime feed.

DEFINE EVENT. Logic that runs on every write.

Changefeeds. A durable, ordered stream of changes.

The database is the event system.Subscriptions, triggers and durable change streams are part of the engine, so realtime is a query.

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Live queries

Turn any SELECT into a subscription over WebSockets, with the same filters and permissions.

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Full records or diffs

Receive the whole updated record, or only the changeset for high-frequency feeds.

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Server-side events

DEFINE EVENT runs logic in the database when data changes: validation, fan-out, derived writes.

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Changefeeds

An ordered, durable stream of mutations per table, replayable within the retention window.

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Filtered subscriptions

Subscribe to one record, a filtered set, a whole table, or a graph-joined shape.

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Permissions apply live

Row-level rules govern subscriptions too, so a client streams only what it may see.

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LIVE QUERIES

Any query can become a subscription

Add LIVE to a SELECT and the same filter, permissions and shape stream to the client on every matching change.

LIVE SELECT

Subscribe with the query you already wrote

LIVE SELECT * FROM document
    WHERE account = $auth.account OR public = true;

-- Stream only what changed, not the whole record
LIVE SELECT DIFF FROM task
    WHERE status != "closed";

-- Stop receiving updates
KILL "0189d1af-8f1c-7f3a-9d4e-2c1b6a5e0f77";

EVENTS AND CHANGEFEEDS

React on write, replay on demand

DEFINE TABLE product CHANGEFEED 7d;

SHOW CHANGES FOR TABLE product
    SINCE time::now() - 1h LIMIT 100;

LIVE QUERIES

What the client receives

LIVE SELECT * FROM message
    WHERE channel = $auth.channel;

-- The client receives each matching change as it commits:
-- { action: "CREATE", result: { id: message:9f2, text: "hi" } }
-- { action: "UPDATE", result: { id: message:9f2, text: "hey" } }
-- { action: "DELETE", result: { id: message:9f2 } }

Pushed from the engine that made the change

Subscribe once

Clients subscribe once and the engine pushes changes as they commit.

One system

Live queries and changefeeds come from the database itself, so there is one thing to deploy.

Consistent with the write

Updates are emitted by the transaction that made them, so subscribers see what committed, in order.

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THE PLATFORM

Everything an application and its agents know. Five surfaces, one engine.

Database

Document, graph, vector, time-series and relational in one engine.

Five data models as dotted tiles: documents, graph, vector, time-series and relational

Agent Memory

What an agent learns, with its source and its time, in the same engine.

A timeline of remembered facts, each with its source

Cloud

Managed clusters in the regions you choose, scaled on demand.

Clusters in three regions on a world map, each running or scaling

Studio

Query, explore and design the schema from the browser.

MCP

Every model that speaks MCP reaches the database and the memory directly.

Three models connected through MCP to the database and Agent Memory

IN PRODUCTION

Trusted at scale. Samsung, Nvidia, Verizon, Tencent, and Walmart run on SurrealDB.

14,000+

Developers building on SurrealDB Cloud

4M+

Developers building on SurrealDB worldwide

FROM THE TEAMS

SurrealDB gives us a foundation where we can unify semantic search, knowledge graphs, and AI-driven decision making without stitching together multiple systems. Collapsing responsibility into SurrealDB has become our default engineering posture.

Justin Foley

VP of Engineering, Later

GET STARTED

Make your data reactive. Subscribe with LIVE SELECT, react with DEFINE EVENT, replay with changefeeds.

Read the docs Start free with SurrealDB

Realtime, built in

The database is the event system.Subscriptions, triggers and durable change streams are part of the engine, so realtime is a query.

Live queries

Full records or diffs

Server-side events

Changefeeds

Filtered subscriptions

Permissions apply live

Any query can become a subscription

Subscribe with the query you already wrote

React on write, replay on demand

What the client receives

Pushed from the engine that made the change

Subscribe once

One system

Consistent with the write

Keep exploring

Live query documentation

Real-time use case

All features

Everything an application and its agents know. Five surfaces, one engine.

Trusted at scale. Samsung, Nvidia, Verizon, Tencent, and Walmart run on SurrealDB.

Make your data reactive. Subscribe with LIVE SELECT, react with DEFINE EVENT, replay with changefeeds.