Auxio

Auxio is a music player by OxygenCobalt for music files stored on your phone or SD card. It has no streaming, no account and no internet permission; the README sums it up as “Completely private and offline”. Playback uses Google’s open-source Media3 (ExoPlayer) library, and since version 4.0 the app reads your files’ tags itself with TagLib instead of relying on Android’s media database.

Your library

• Tags read properly: disc numbers, several artists per song, release types such as EPs and singles, original dates and sort tags. Artists and album artists are combined into one list.
• Where the music comes from: by default you pick the folders through Android’s file picker, which the setting describes as “Slower, but more reliable”; the alternative is to load what Android itself has found, which is faster but doesn’t support cover.jpg files in folders.
• Album covers from the files themselves or cover images in the folder. By default the app re-encodes them to save space.
• Playlists, which you can also import and export as M3U files.

Playback

• Gapless playback, automatically.
• ReplayGain on MP3, FLAC, Ogg, Opus and MP4 files. By default it uses album gain when you play an album and track gain otherwise, with a pre-amp setting.
• Android Auto, a home-screen widget that adapts to its size, a Tasker action, and optional playback when headphones are connected (off by default).
• The 4.1 versions redesigned the app in Google’s Material 3 Expressive style, with a new playback screen: tap the cover to skip back or forward within a song, swipe it to change songs.

What goes online

Nothing. The app has no internet permission, so Android doesn’t let it open network connections, and its manifest even removes the network-status permission that the playback library would add. The developer has said Last.fm scrobbling and other online features won’t come: “I don’t want to implement any connectivity features unless Auxio becomes a music streaming client”. Links to the project’s GitHub page and its feedback address open in other apps when you tap them.

About this file

• This is F-Droid’s build of version 4.1.5, from August 2026, signed with F-Droid’s key. The developer’s APKs on GitHub use their own key, so you can’t install one over the other; export your playlists as M3U files before switching. Auxio isn’t on Google Play.
• 4.1.5 fixed playlist edits that weren’t saved between app starts.
• Known open issues: in Android Auto the Songs tab can keep loading forever, while albums, artists and playlists work (#1398); now and then the next track stays silent (#1374), which the developer calls “a known ExoPlayer bug”; and exporting a playlist straight into the Downloads folder on Android 17 crashes (#1449).
• The 11.2 MB file runs on Android 7.0 and later, on ARM and x86, 32- and 64-bit. It contains TagLib and a small FFmpeg build with only the FLAC and ALAC decoders. Its 9 permissions cover reading your music, playing in the background and notifications. Our scan found no trackers.
• There are no screenshots here: the project’s own all show commercial album covers, which the developer has called “copyright-ambiguous album art usage”.
• Auxio is licensed under the GPL-3.0. The source of this version is at https://github.com/OxygenCobalt/Auxio/tree/v4.1.5.

CPU types in this build: arm64-v8a (64-bit ARM, almost every phone since 2017); armeabi-v7a (32-bit ARM, older and budget phones); x86 (32-bit Intel, emulators); x86_64 (64-bit Intel, emulators and Chromebooks).

Versions currently kept in the F-Droid repository. We host and check only the newest one. Full changelog.