Multisynq Client

Multisynq lets you build real-time multiuser apps without writing server-side code. Unlike traditional client/server architectures, the multiplayer code is executed on each client in a synchronized virtual machine, rather than on a server. Multisynq is available as a JavaScript library that synchronizes apps using Multisynq's global DePIN network.

• can be hosted as a static website
• no server-side code needed
• no networking code needed
• independent of UI framework

Getting Started

Get a free API key from multisynq.io.

npm i @multisynq/client

You can also use the Multisynq pre-bundled files, e.g. via a script tag

<script src="https://cdn.jsdelivr.net/npm/@multisynq/[email protected]/bundled/multisynq-client.min.js"></script>

or via direct import as a module

import * as Multisynq from "https://cdn.jsdelivr.net/npm/@multisynq/[email protected]/bundled/multisynq-client.esm.js";

Structure your app into a synchronized part (subclassed from Multisynq.Model) and a local part interacting with it (subclassed from Multisynq.View). Uses Multisynq.Session.join() with your API key to join a session.

That's it. No deployment of anything except your HTML+JS.

Follow the documentation at multisynq.io/docs and the example apps in the Multisynq GitHub repos.

The Prime Directive

Your Multisynq Model must be completely self-contained.

The model must only interact with the outside world via subscriptions to user input events that are published by a view. Everything else needs to be 100% deterministic. The model must not read any state from global variables, and the view must not modify model state directly (although it is allowed to read from it).

Besides being deterministic, the model must be serializable – it needs to store state in an object-oriented style. That means in particular that the model cannot store functions, which JavaScript does not allow to be introspected for serialization. That also means you cannot use async code in the model. On the view side outside the model you're free to use any style of programming you want.

Servers and networking

Multisynq runs on the Multisynq DePIN network which automatically selects a server close to the first connecting user in a session.

All application code and data is only processed on the clients. All network communication and external data storage is end-to-end encrypted by the random session password – since the server does not process application data there is no need for it to be decrypted on the server. This makes Multisynq one of the most private real-time multiplayer solutions available.

Open source

The Multisynq Client is licensed under Apache 2.0.

Change Log

[1.0] - 2025-04-23

Public release