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In iOS 18, Siri indexes roughly 30% more personal data than it did in iOS 17, reaching into notes, messages, and even third‑party app caches.
What Siri is indexing now
Apple’s voice assistant pulls metadata from Messages, Mail, Notes, and any app that stores searchable text. The change stems from the new On‑Device Intelligence framework, which builds a local knowledge graph to answer queries faster without sending data to the cloud.
The framework stores a compressed index on the device’s SSD, meaning the data never leaves your hardware—but the trade‑off is that Siri now “knows” more about your daily habits, calendar events, and even health‑related reminders.
How to trim the data Siri sees
Apple provides three clear levers in Settings → Siri & Search. First, turn off Learn from this App for any app you consider sensitive. Second, disable Suggest Siri Shortcuts to stop Siri from auto‑creating voice commands based on app usage. Third, use the new Privacy → Analytics & Improvements toggle to delete the on‑device index entirely.
For a step‑by‑step guide, see Apple’s official support page How to manage Siri privacy. After toggling the settings, a quick reboot forces Siri to rebuild a minimal index, stripping out the bulk of the newly added data.
“Siri’s expanded indexing improves responsiveness, but it also raises privacy flags for power users,” said security analyst Maya Patel.
Developers can also limit exposure by adding the NSUserActivityType NSUserActivitySearchableItem flag only to content they deem safe. Apple’s Apple full‑disk access changes curb AI agent abuse article explains how the same permissions model applies across the ecosystem.
Key takeaway
- Siri now indexes ~30% more data on iOS 18.
- Disabling “Learn from this App” stops app‑level crawling.
- Reboot after changes forces a leaner on‑device index.
- Privacy settings live under Settings → Siri & Search and Settings → Privacy.
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