# Colyseus

> MIT Node multiplayer rooms with state sync

**Category:** Libraries  
**Pricing:** open-source  
**URL:** https://colyseus.io  
**GitHub:** https://github.com/colyseus/colyseus  
**Added:** 2026-09-03

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## The Hook

Colyseus is the authoritative multiplayer server a browser game can self-host for nothing.

## What's Good

MIT. State sync, matchmaking, SDKs for JavaScript, Unity, Defold, Construct 3, Haxe. create-colyseus-app. Site: free forever, even for commercial games. Pair it with Phaser or KAPLAY.

## The Catch

A server framework, not a renderer. Colyseus Cloud has no free tier — it starts at 15 USD/mo. Capacity depends on your code, not a marketed CCU cap.

## Verdict

MIT multiplayer rooms. Self-host is the free path; Cloud is paid from dollar one.