Privacy

Familiar is a self-hosted music player. You install the app on your device and point it at a backend you control — your own machine, a home server, or (for App Store review) a shared demo server at familiar-demo.fly.dev. This page describes what data Familiar handles and where it goes.

What stays on your device and your server

• Your music files. Audio is never uploaded off your device or backend.
• Profile name, color, favorites, and play history. Stored on the backend you choose.
• Offline-cached tracks and playlists. Held in the app's local storage; removed when you uninstall.

Data sent to third parties (only when you opt in)

• Your own AI assistant, if you connect one — Familiar holds no API key and calls no model. It exposes an MCP server, and an MCP host you run and configure — Claude Desktop, say — connects to it on your behalf. Anything you type goes from that host to whichever provider you have signed in to, on your account and under their privacy policy, not through Familiar. What crosses the connection from Familiar's side is the answers to the tool calls your host makes: search results, track and playlist metadata, playback state. Never audio.
• Last.fm — if you connect a Last.fm account, Familiar scrobbles now-playing metadata (artist, title, duration) to ws.audioscrobbler.com.
• LRCLIB — synced lyrics are fetched from lrclib.net by track title / artist / album / duration.
• MusicBrainz and Cover Art Archive — used for metadata and artwork lookups; only the fields named are sent.
• AcoustID — optional audio fingerprint lookup for unknown tracks.
• Community cache (familiar-cache.fly.dev) — if you opt in, SHA-256-hashed audio fingerprints and precomputed features or embeddings are shared so other users can skip analysis. No filename, metadata, or personal information is transmitted.
• Bandcamp, iTunes, Qobuz, Discogs, 7Digital, Amazon Music, YouTube — user-initiated search and discovery links that open in your browser or stream video on demand.

What we don't do

• No analytics SDKs (no Google Analytics, Mixpanel, Sentry, etc.).
• No advertising identifiers, no ad tracking, no ads.
• No location, contacts, photos, health, or financial data.
• No sharing or selling of personal data to third parties.

Retention and deletion

All personal data lives on the backend you control. Delete a profile from the app to remove its data from the backend. Uninstall the app to remove any local cache from your device.

Contact

Questions about privacy: jeff@seethroughlab.com.