Colyseus is an open-source Node.js framework for building real-time multiplayer games, with matchmaking and state synchronization.
Alternatives to coherence
Photon Realtime is a cloud-hosted networking service for building cross-platform real-time multiplayer games.
Unity Engine is development software for making games and apps, including immersive experiences built from CAD and 3D data.
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Normcore
Normcore is a networking solution for Unity projects, with networked physics, persistent spaces, voice chat, and XR support.
Free planAndroidiOSWebLinux7.5From $49 a month - 5
SmartFoxServer
SmartFoxServer is a client/server SDK for building real-time multiplayer games, MMOs, virtual communities, and other shared experiences.
Free planAndroidiOSWebAPI7.5From €32.50 a month - 6

Photon Fusion
Photon Fusion is a state-transfer networking SDK for making multiplayer games with Unity, Unreal, and Godot.
Free planAndroidiOSWebLinux7.4From $0.50 a month - 7

FishNet
FishNet is a networking solution for Unity games, with a client-server model and free use without CCU caps or paywalls.
Free planAndroidiOSWebLinux7.3$50, paid once - 8

Photon Quantum
Photon Quantum is a deterministic ECS framework for Unity online multiplayer games, with sessions listed for up to 128 players.
Free planAndroidiOSWebLinux7.3From $0.50 a month - 9

Amazon GameLift Servers
Amazon GameLift Servers deploys, operates, and scales dedicated cloud servers for session-based multiplayer games.
AndroidiOSWebAPI6.9From $1 a month - 10

Mirror Networking
Mirror Networking is a free, MIT-licensed system for adding multiplayer capabilities to Unity games.
Free planAndroidiOSWebLinux6.7Free plan - 11
Netcode for GameObjects
Netcode for GameObjects is Unity’s networking library for synchronizing GameObjects and world data during multiplayer sessions.
Free planAndroidiOSWebLinux6.7Free plan - 12
Netick
Netick is a free networking solution for building server-authoritative, state-synchronized multiplayer games in Unity.
Free planAndroidiOSWebLinux6.7Free plan - 13
LiteNetLib
LiteNetLib is a free, MIT-licensed UDP networking library for .NET Standard 2.1, Mono and .NET.
Free planAndroidiOSLinuxmacOS6.6Free plan - 14
netcode.io
netcode.io is an open-source client/server protocol for real-time multiplayer games, using UDP to exchange unreliable, unordered packets.
Free planLinuxmacOSSelf-hostedWindows6.6Free plan - 15
Riptide Networking
Riptide Networking is a free, lightweight C# library for connections and data exchange in multiplayer games.
Free planAndroidiOSLinuxmacOS6.6Free plan - 16
GameNetworkingSockets
GameNetworkingSockets is a free, open-source transport library for games that sends reliable and unreliable messages over UDP.
Free planiOSAPILinuxmacOS6.5Free plan - 17
Naia
Naia is a free Rust networking library for multiplayer games built around server-controlled entity replication and typed messages.
AndroidiOSWebLinux6.4 - 18
Open Match
Open Match is a free, open-source framework for developers building a game matchmaker.
Free planAPISelf-hosted6.4Free plan - 19
Steamworks
Steamworks is Valve’s collection of tools and services for managing and operating games on Steam.
Free planAPILinuxmacOSWindows6.3Free plan - 20

Steam Input
Steam Input is a controller configuration system built into the Steam client.
APILinuxmacOSWindows6.0 - 21
DarkRift 2
DarkRift 2 is a free, open-source networking library for multiplayer experiences that need an authoritative server.
Free planLinuxSelf-hostedWindows5.9Free plan - 22
GGRS
GGRS is a free, open-source Rust library for peer-to-peer rollback networking in games.
WebAPILinuxmacOS5.9 - 23
GGPO
GGPO is an open-source networking library for peer-to-peer games that uses rollback to keep play moving while remote inputs travel between players.
Free planWindows5.8Free plan - 24
Photon Server
Photon Server is a paid, on-premises real-time socket server and cross-platform multiplayer framework.
APISelf-hostedWindows5.2 - 25
Renet
Renet is a free, open-source Rust network library for server and client multiplayer games, aimed at fast-paced and competitive play.
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