Free and Open-source
Multiplayer Framework
Own your authoritative game servers. Versatile for any genre or platform.
npm create colyseus-app@latest ./my-server
Meet Colyseus Features
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Automatic state synchronization.
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Match-make clients into game rooms on demand.
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Scale to millions across different game rooms.
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Authoritative server to prevent hacks on the client.
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Leverage the ever-growing JavaScript ecosystem.
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Open-source, under the most permissive MIT License.
Supports your favorite engine & platform
Trusted and Loved by Indies and Studios Worldwide
"...the operational cost associated with running a Colyseus server is substantially lower than alternatives we tried." Adrian Olczyc - CEO at Eleven Puzzles 
"I had previously never worked with Websockets, authoritative multiplayer servers, or Node.js. But that wasn’t a problem, as Colyseus provided me with an intuitive start. This strong foundation allowed us to grow to where we are today." Sandro Wahl - Creator of Make it Meme 
"We have been in love with Colyseus since the first moment we discovered it. It is amazing to have such an extraordinary product available for free and as open source." Pablo and Eibriel - Creators of GolfCraft Games using Colyseus
A selection of multiplayer games made by happy developers.
Bloxd.io by Arthur Baker 
SongTrivia2 by SongTrivia Cryzen.io by Adel Norberg Unboxing the Cryptic Killer by Eleven Puzzles 
Kirka.io by xip Knight's Edge by Lightfox Games Wheat Farming by Emre Şahin Make it Meme by prealpha Seep King by Jaspreet Singh Exploder.io by Piotr Dawidiuk The Kraken Wakes by Charisma Entertainment Exposed - Who's Most Likely To by VYS Games Super Battle Legends by Hammerplay Raft Wars Multiplayer by TinyDobbins 
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SongTrivia2 by SongTrivia Cryzen.io by Adel Norberg Unboxing the Cryptic Killer by Eleven Puzzles Kirka.io by xip Knight's Edge by Lightfox Games Wheat Farming by Emre Şahin Make it Meme by prealpha Seep King by Jaspreet Singh Exploder.io by Piotr Dawidiuk The Kraken Wakes by Charisma Entertainment Exposed - Who's Most Likely To by VYS Games Super Battle Legends by Hammerplay Raft Wars Multiplayer by TinyDobbins Join our growing community
660K+ Downloads
5.2K GitHub Stars
80 Contributors
2.6K Members
Deploy your servers in minutes
Colyseus Cloud is ready to serve hundreds and thousands of CCU. No ops required.
Learn more