Since macOS 13, every Mac includes two daemons—knowledgeconstructiond and intelligenceplatformd—that build a personal knowledge graph by analyzing device data such as Contacts, Calendar, Photos, Messages, Mail, location, and device usage signals. This graph stores highly structured information about the user, their relationships, activities, locations, and communications in a local SQLite database, enabling personalized AI features and LLM queries, though documentation is minimal. The open-source iKnow dashboard offers users the ability to inspect this database, while analysis also highlights privacy concerns about centralized, detailed personal data collection on device.
https://8rank.ai/game/apple-intelligence-personal-knowledge-graph