Inside Apple's Personal Knowledge Graph: What Your Mac Is Tracking

The discovery that Apple maintains sophisticated local databases for biographical intelligence—including app usage, location, browsing behavior, and Apple Intelligence invocations—raises critical questions about data collection practices and what's actually retained on users' devices. The architecture reveals Apple's use of Wikidata-based topic classification and temporal decay scoring, indicating a surprisingly complex personal profiling system running silently on every Mac. This analysis is essential for understanding both the technical sophistication of Apple's ecosystem advantage and the privacy implications that may not be immediately apparent to users.