DARK DOJO STUDIOS

OSK (Online Systems Kit) is a lightweight Unreal Engine 5 plugin that gives you direct access to the Steamworks API through Blueprint nodes. No abstraction layers, no third-party dependencies. Just clean, direct Steam integration you can wire up in minutes.

What You Get

• 18 fully Blueprint-exposed modules covering everything you need for Steam integration:
• Auth and Identity: Steam ID, persona name, app ownership, session validation
• Friends: Friends list, online status, game activity, avatar textures, overlay actions
• Lobbies: Create, join, invite, kick, promote, lobby data
• Matchmaking: Server browser with internet and LAN search, filters, lobby-to-server bridge
• Voice Chat: Push-to-talk capture, decompression, proximity VOIP via UE Attenuation
• Achievements and Stats: Unlock, query, set int/float stats, auto-synced with SDK v1.61
• Cloud Saves: Read/write/delete files, quota management, cross-machine persistence
• Leaderboards: Find, upload scores, download entries (global, around user, friends)
• Steam Workshop: Create, update, subscribe, query items
• Rich Presence, Steam Music, Utils, DLC Checks, Parental Settings, Screenshots, Remote Play

Why OSK Over Other Plugins

• Direct Steamworks C API calls. No wrapper on top of a wrapper.
• Ships with prebuilt binaries. No Visual Studio or C++ compilation required.
• Ships with working example Blueprints: GameInstance with Steam validation, full Social - Hub widget with friends list and squad panel.
• Coexists with OnlineSubsystemSteam for full Steam overlay support.
• One plugin, zero dependencies beyond SteamShared (included with UE).

Features

• Steam Authentication and Ownership Verification
• Friends List with Avatars and Online Status
• Steam Lobbies with Invite, Kick, and Promote
• Server Browser with Filters
• Push-to-Talk Voice Chat with Proximity VOIP
• Achievements and User Stats
• Cloud Saves
• Leaderboards
• Steam Workshop Support
• Rich Presence
• DLC Checks
• Full Blueprint Example Project Included

Supported Engine Versions

Currently supports Unreal Engine 5.7. Additional engine version support coming soon.

Documentation

https://darkdojostudios.com/pages/osk-plugin-documentation

License

One-time purchase. Permanent access to all updates. Licensed for use in your own game projects. You may modify any source code. You may not resell, redistribute, or share your license.