Sync engine

Live queries over WebSocket.

db.useQuery is a WebSocket subscription. Pylon walks the change log on every write and pushes the exact diff to each subscribed client, keeping the UI current without polling or cache invalidation.

Create your account →Read the docs

components/Messages.tsx

import { db } from "@pylonsync/react";
 
function Messages({ roomId }: { roomId: string }) {
  // A live subscription. Re-renders the instant anyone,
  // anywhere, inserts or edits a matching Message row.
  const { data: messages } = db.useQuery<Message>("Message", {
    where: { roomId },
  });
 
  return messages.map((m) => <Bubble key={m.id} message={m} />);
}

Subscriptions update in milliseconds because the server pushes diffs instead of waiting for clients to poll
Local-first: reads hit an in-browser store, writes apply optimistically and reconcile
Queue mutations offline and sync them when the connection returns
Multi-tab coherent via a leader election over BroadcastChannel

How it works.

orders · subscribed

db.useQuery("Order")live

ord_9f2aSarah Chen$1,240

ord_7c41Marcus Lee$880

ord_5b88Priya Nair$2,100

ord_3d10Elena Duarte$640

diff streamed to 44 clients

On every write, Pylon walks an append-only change log and finds the affected subscriptions. Clients receive a minimal insert, update, or tombstone instead of fetching the result again. A 10,000-row table therefore updates as cheaply as a 10-row one.

What you’d otherwise wire up.

Each line is a piece teams normally assemble for this one capability. On Pylon it is part of the runtime.

A WebSocket server, plus reconnect and backoff logic
A client cache and the invalidation rules that keep it honest
Optimistic update plumbing and its rollback path
A polling loop, or an SSE fallback for browsers that drop the socket

Apps built with it.

Scaffold any of these with npm create @pylonsync/pylon.

All examples →

liveMarketplace

A trading marketplace deployed from a monorepo, with listings, watchlists, an activity feed, faceted search, and per-user ownership.

Faceted searchfield.owner()Optimistic inserts

template: marketplaceOpen

liveWorld3D

A multiplayer procedural island with three.js in the browser and Pylon SSR and realtime sync on the server. Every visitor moves through the same world.

Realtime multiplayerthree.js + SSRLive sync

Open

Consumer app

A social feed with live posts and likes, public reads, and owner-only writes.

Live feedPublic readsfield.owner()

template: consumer

Keep exploring

Database

Typed schema. Migrations on save.

Realtime

Rooms, presence, and authoritative shards.

Server functions

Backend logic in TypeScript.

Build it on Pylon.

One framework for your schema, sync, auth, functions, realtime, and SSR. Free to start.

Create your account →Read the docs