Plane is a distributed system for running stateful WebSocket backends at scale. Plane is heavily inspired by Figma’s multiplayer infrastructure (opens in a new tab), which dynamically spawns a process for each active document.

Use cases include:

• Scaling up authoritative multiplayer backends (opens in a new tab).
• Running isolated code environments (like REPLs, code notebooks, and LLM agent sandboxes).
• Data-intensive applications that need a dedicated high-RAM process for each active user session.

Architecture Overview

See the architecture guide for a detailed explanation of each component.

Getting Started

• Jump in with the quickstart guide.
• Familiarize yourself with the concepts and architecture used in Plane.