GOG Galaxy vs Multiplayer API

GOG Galaxy brings game libraries and friends from different gaming platforms into one app for Windows and macOS. It can collect PC and console games, including titles that are not installed, and track achievements, play time, and owned games across connected services. For PC games, it can install and launch titles owned on different platforms. Library tools include filtering, sorting, tagging, changing game visuals, saving views, and editing metadata. Galaxy combines friends lists, online status, activity, and cross-platform chat. Games can enter the library through official or community-made integrations, or be added manually; community integrations are open source, and GOG provides documentation for creating them. Library changes sync between devices, and offline mode is available. GOG says it does not share imported personal data with third parties and removes it from its servers when a platform is disconnected. GOG-specific features include auto-updates, cloud saves, multiplayer, matchmaking, and rollbacks. Other platforms’ client software is needed for their platform-specific features. The app is free with a GOG account.

Multiplayer API has no write-up on Specifiction yet; its figures are above.