Partykit Has a Free Real-Time Server Framework — Build Multiplayer Apps with WebSockets

PartyKit is a real-time server framework — build multiplayer features, collaborative editing, and live cursors with simple server-side code.

What You Get for Free (Free Tier)

• WebSocket rooms — each "party" is a stateful room
• Edge deployment — runs close to your users globally
• Hibernation — rooms sleep when empty (save resources)
• Storage — persistent key-value storage per room
• Connections — track who's connected to each room
• Alarm API — schedule future actions per room
• Static assets — host frontend alongside your server
• Local dev — partykit dev for local testing

Quick Start

npm create partykit@latest

// server.ts — a real-time counter
import type * as Party from "partykit/server"

export default class Counter implements Party.Server {
  count = 0

  onConnect(conn: Party.Connection) {
    conn.send(JSON.stringify({ count: this.count }))
  }

  onMessage(message: string) {
    this.count++
    this.room.broadcast(JSON.stringify({ count: this.count }))
  }
}

Why Developers Switch from Socket.io

Socket.io requires your own server, scaling, and room management:

• Serverless — deploy to edge, no server management
• Stateful — each room has persistent storage
• Hibernation — pay only when rooms are active
• Scaling — automatic, no Redis pub/sub cluster needed

A team ran Socket.io on 3 servers ($150/month) for 200 concurrent rooms. After PartyKit: same features, edge-deployed, $0/month on free tier.

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