instantdb/instant

Instant is a modern Firebase. We make you productive by giving your frontend a real-time database.

Summary

Instant is an open-source backend that combines auth, permissions, storage, presence, and real-time streams into a single service, with TypeScript and JavaScript client SDKs. Engineers write relational queries (InstaQL) shaped like the data they want, and Instant handles fetching, permission checks, optimistic updates, rollback, and local caching. Every query is multiplayer by default, so updates from one client reach other clients without extra plumbing.

What it is useful for

Instant targets the recurring work of standing up a modern app: a database, caches, ORMs, and endpoints on the server, plus stores, selectors, and mutators on the client, and then stateful servers if you want real-time sync. By exposing a queryable data layer to the client itself, it collapses most of that boilerplate into a few SDK calls.

Concrete fits the README points to:

• Real-time collaborative UIs such as chat, comments, or multiplayer editors, where the same query needs to stay in sync across users.
• Apps that want optimistic UI with automatic rollback when writes fail.
• Offline-capable apps on the web or in React Native, since the SDK persists recent queries to IndexedDB or AsyncStorage.
• Ephemeral data like "who is online" or live cursor positions, handled through its presence and topics support.
• Authorization rules that travel with the data, enforced through a permission layer built on Google's CEL library.

The README's working chat demo is roughly twelve lines of React using @instantdb/react: a useQuery for reads, a transact call for writes, and a render function. That snippet is a fair picture of the surface area a typical feature touches.

How engineers can use it

The documented path is to sign up on instantdb.com, create an app from the dashboard, and follow the quickstart at instantdb.com/docs. The React example initializes the client by passing an appId from NEXT_PUBLIC_APP_ID to init from @instantdb/react; the top-level README does not spell out install commands or environment variables, so the docs site is the authoritative source for project setup.

Documented limitations:

• Official SDKs listed in the README are JavaScript, React, and React Native only; no Python, Go, or other server-side client is mentioned.
• Running Instant locally requires reading the client/ and server/ subdirectory READMEs. The top-level README does not include those commands.
• Under the hood, all user data is stored as triples in a shared multi-tenant Postgres database, so per-app scale is bounded by the shared infrastructure rather than a dedicated cluster.