Every Mac comes with an undocumented personal knowledge graph system

Starting with macOS 13 released in 2022, every Mac computer includes background daemons whose primary purpose is to build a comprehensive relationship graph about the user. The system cross-references contacts, calendar events, photos, messages, and behavioral signals directly on the device.

How the Hidden Knowledge Graph Works - The system aggregates data from dozens of local sources including location, screen time, and communication logs. - Data is stored in ~/Library/IntelligencePlatform as a collection of SQLite databases protected by TCC permissions. - Machine learning models, including XGBoost classifiers, are used to infer familial relationships and social connections.

Analysis and Relationship Classification The graph uses a rich ontology of entity classes and predicates to map out interactions, habits, and daily activities. Specialized models process hundreds of behavioral features to score relationships like family members, coworkers, and friends automatically.

Researchers have open-sourced a local dashboard tool called iKnow, enabling Mac users to inspect the contents of their personal knowledge graphs. This finding highlights important privacy considerations regarding on-device data collection and the depth of behavioral profiling present in modern operating systems.