What Loom does with your data.
Loom is a local Mac app for personal reading and thinking. The short version: everything stays on your Mac, except for the prompts you send to the AI you configured.
What never leaves your device
- Your source files (PDFs, notes, slides, anything in the folder you picked)
- Your highlights, anchors, panels, weaves, quiz attempts, reading history
- Your API keys (stored in macOS Keychain; Loom reads them only at AI-call time)
- There is no Loom analytics service. Loom doesn't phone home.
What leaves when you use AI features
When you invoke an AI feature (ask AI about a selection, tighten/rewrite/expand a passage, generate a suggestion), Loom sends the prompt you generate to the AI provider you chose (Anthropic in the default build) using the API key you supplied. That provider's privacy policy governs what they do with the content of your request.
- Anthropic: https://www.anthropic.com/legal/privacy
Loom itself does not relay, mirror, or store copies of your AI traffic on any server. There is no Loom server.
What Loom stores locally
- IndexedDB + SwiftData stores for traces, panels, weaves, quiz results, chat history
- UserDefaults entries prefixed
loom./wiki:for app preferences - macOS Keychain entries for API keys under service
com.yinyiping.loom - A security-scoped bookmark for the folder you picked as your content root
Settings > Data clears Loom preferences and web storage. To fully clear the app's sandboxed container, including SwiftData databases, delete ~/Library/Containers/com.yinyiping.loom in Finder. Remove API keys from Settings > AI Provider, or delete the com.yinyiping.loom entries in Keychain Access.
Required-reason APIs
Per Apple's Privacy Manifest rules, Loom declares these APIs and the reasons it uses them:
- UserDefaults (CA92.1) — persists Loom's own preferences
- File timestamps (C617.1) — displays "touched X ago" sort order for uploads and cowork documents
Contact
Questions? Use the Loom support page for help and issue reporting.
Last updated 2026-04-24.