SmartFoxServer is a comprehensive SDK for rapidly developing multiplayer games and applications with Unity, HTML5, Godot, iOS, Android, Java, UWP, Adobe Flash/Flex/Air, C++ and more.
SmartFoxServer comes with a rich set of features, an impressive documentation set, tens of examples with their source, powerful administration tools and a very active support forum.

Born in 2004, and evolving continuously since then, today SmartFoxServer is the leading middleware to create large scale multiplayer games, MMOs and virtual communities.
Thanks to its simplicity of use, versatility and performance, it currently powers hundreds of projects all over the world, from small chats and turn-based games to massive virtual worlds and realtime games.

November 10th, 2025SFS2X Patch 2.20.4 is ready!

We have just released update 2.20.4 which brings security updates for Tomcat and introduces several new security features for managing upload requests.

You can read the full release notes and download the patch from our Updates download section.

June 20th, 2025SFS2X Patch 2.20.3 is available!

We have just released update 2.20.3 which brings a Tomcat security update and introduces a new feature to protect locally stored Admin passwords as hashes.

You can read the full release notes and download the patch from our Updates download section.
Also, you can read more info about the password protection feature here.

There is also a small update for the Java client API (1.8.4) introducing a TCP timeout parameter in the ConfigData object. This allows to let the BlueBox trigger earlier, where needed. You can find the details in our Client API download section.

June 6th, 2025Updated examples for Unity 6.x

Hello,
we have just released an updated version of our Unity tutorials for Unity 6 using the new Input System, TextMeshPro and URP which is now the default.

You can grab the new Example Pack directly from our download page, or from the Unity Asset Store.

April 10th, 2025Announcing SmartFoxServer 3!

After almost a year of ‘radio silence’ we’re happy to announce that SmartFoxServer 3 is coming soon. This is a new, major release of SmartFoxServer that provides a substantial upgrade with lots of new features, improvements and streamlining.

Read all the details of the announcement in our newsletter.

March 25th, 2025SmartFoxServer 2.20.2 and API updates

We have just released update 2.20.2 which introduces a couple of fixes, in particular it adds support for multi-byte strings in SFSObject keys.

You can read the full release notes and download the patch from our Updates download section.

Similarly we have updated our Java and Javascript client API to reflect these changes.
You can find them in the relative Client API download section.

p.s. = the other client APIs already support this feature correctly, so no update was necessary.

Read all the news