MirrorNetworking/Mirror

Health v2 · maintenance only

Adoption not part of the score

6305 stars · 869 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Mirror is the most popular free open-source networking library for Unity, forked from Unity's deprecated UNET HLAPI and battle-tested since 2014. It provides high-level client-server multiplayer features like spawning, synchronization, RPCs, and pluggable transports (Telepathy, KCP, etc.) for games of all sizes, including MMORPGs.

Use cases

• add multiplayer to a Unity game
• build an MMORPG in Unity
• synchronize player positions and game state over the network
• replace Unity's deprecated UNET HLAPI
• create a dedicated server for a Unity game
• make a VR multiplayer game like Population: ONE
• choose a transport layer (TCP, UDP, KCP) for Unity networking

When to choose

• you are building a multiplayer game in Unity and want a free, proven, well-documented solution
• you need high-level networking abstractions (NetworkBehaviour, SyncVars, Commands) rather than raw sockets
• you are migrating away from Unity's UNET or Netcode alternatives
• you want a large community, Discord support, and a track record of shipped Steam games

When to avoid

• your project is not built on Unity
• you need authoritative server infrastructure with matchmaking, lobbies, and hosting managed for you (consider a backend service)
• you need peer-to-peer or relay networking rather than client-server
• you are doing non-game real-time networking where a general-purpose protocol library fits better

Facets

library · maturity stable

networking game-engine websocket serialization gaming-tools cross-platform game-engine cross-platform unity multiplayer unet hlapi udp tcp kcp telepathy mmo game-networking client-server sync-vars game-development real-time c#

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markdown · JSON · MCP: product_card(name="MirrorNetworking/Mirror")