Liner

Privacy Policy

Last updated: September 3, 2026

Liner is a local music player. It plays the audio that is already on your device. We do not run accounts, we do not show ads, and we do not track you or sell data. This page explains exactly what the app does and does not do with your information.

The short version

No account or sign-up. The app works fully offline.
No ads, no analytics, no advertising IDs, no third-party trackers.
Your music stays on your device unless you use Share library to copy it to another phone on the same Wi-Fi.
Optional network use: lyrics and cover art lookups online, or Share library phone-to-phone on your local Wi-Fi. Nothing is uploaded to Liner.

01 Information we collect

Liner does not collect, store, or transmit any personal information to us. We have no servers, no database of users, and no way to identify you. We never see your library, your listening habits, or any usage data.

The app accesses the following only on your device:

Audio files & their metadata — song title, artist, album, duration, and embedded artwork, read from your device's media storage so the app can build your library and play music.
App settings — your theme, lyric, playback, and Focus preferences, saved locally on the device. Focus is a manual simple-player layout (lyrics hidden).
A local cache — lyrics and cover-art images fetched online are saved on your device so they're available offline and don't need to be fetched again.

None of this information leaves your device except as described in the next sections.

02 Network use & third parties

Optional · can be turned off

To show synced lyrics and missing album art, Liner can look them up online. When this is enabled, the app sends a search query containing the song title and artist name (and sometimes album and track duration) to public music-metadata providers. No personal identifiers, accounts, or device IDs are attached to these requests.

Lyrics may be requested from:

LRCLIB, Musixmatch, Kugou, QQ Music, Kuwo, Migu, and Megalobiz

Cover art may be requested from:

Apple iTunes, Deezer, MusicBrainz / Cover Art Archive, QQ Music, Genius, Kugou, and Kuwo

These are independent third-party services with their own privacy practices. Your network request (including your IP address, as with any internet request) is handled by them under their own policies. Liner has no affiliation with or control over these providers.

You can disable all online look-ups in Settings → Lyrics → Fetch lyrics online. With look-ups off, Liner does not contact those providers. Optional Share library (below) is separate and only uses your local Wi-Fi when you start it.

03 Share library

Optional · same Wi-Fi only

Share library lets you copy your music and Liner data (such as playlists, cached lyrics, and settings) to another phone that is also running Liner. Both phones must be on the same Wi-Fi network. You start Send or Receive yourself with a one-time code.

The transfer goes phone to phone on your local network. It does not upload to the internet, a cloud service, or any Liner server. We never receive your files. The connection is encrypted between the two devices.

If you use Receive, the other phone's music and related Liner data are saved onto your device so you can play them in Liner.

04 Permissions we request

Music & audio (READ_MEDIA_AUDIO / storage) — to find and play the audio files on your device. This is the core function of the app.
Notifications — to show playback controls (play, pause, skip) in the notification shade and on the lock screen, and progress while Share library is running.
Internet, Wi-Fi & network state — for optional lyrics and cover-art look-ups, and for optional Share library on your local Wi-Fi.
Foreground service — to keep music playing while the app is in the background, and to keep a Share library transfer running if you leave the screen.

Liner does not request access to your contacts, location, camera, microphone, or any other sensitive data.

05 Writing to your files

If you choose to embed lyrics (manually, or via the optional auto-embed setting), Liner writes those lyrics into the metadata tags of the relevant audio file on your device. This happens locally, only for files you act on, and only at your direction.

If you Receive a shared library, Liner saves the transferred audio files into your device music storage (and related Liner data into the app) so they appear in your library.

06 Data storage & security

All app data — your settings and the lyrics/artwork cache — is stored locally on your device in the app's private storage. Focus preference stays on device only. Because nothing is sent to or held by us, there is no remote copy of your data to breach. Uninstalling the app removes this data. You can also clear the lyric cache at any time in Settings → Lyrics → Clear lyric cache.

Share library transfers stay on your local network between the two phones you choose. Liner does not keep a copy of that transfer.

07 Children's privacy

Liner does not knowingly collect any personal information from anyone, including children. The app contains no ads and no data collection.

08 Changes to this policy

If the app's behavior changes, this policy will be updated and the "Last updated" date above will change. Material changes will be reflected here before they take effect in a released version.

09 Contact

Questions about this policy or the app can be directed to the developer, Black.X:

GitHub: github.com/DARKSIDE957