Attacca [atˈtakka]: in music, go straight on to the next movement, without a pause.
Your own music, played as if someone had listened to every track first. Attacca measures your files right on your phone — how each track starts and ends, how it sounds, its mood — and plays them so one song flows into the next.
- 🔗 Chained lists. It hears how each track ends and the next begins (tempo, key, timbre, energy) and puts any list in an order where every change feels natural. A whole list from a single track, in one tap.
- 🎚️ A complete sound chain. Graphic and parametric equalizer with headphone corrections, dynamic and virtual bass, stereo width, crossfeed, compressor and true-peak limiter; gapless playback, crossfades that follow how each track ends, silence trimming, ReplayGain. A profile for each output: headphones, car, speaker.
- 🌄 O'rama: watch the song. A moving landscape drawn from the song's waveform, mood and beat: someone runs, rides or flies through castles, cities, seas and space, jumping on the strong beats, through tunnels with a torch, towards a gate into the next track's world. And a few little surprises to find.
- 🎭 Moods and sound families, found by ear. A sound-recognition network runs on the phone itself and groups your music by how it sounds: lists by mood and family, without anyone else's tags.
- 🎨 Make it yours. Themes with their own colours, fonts, backgrounds and icons, and a Now playing screen you lay out piece by piece; a gallery of themes to start from.
- 🔒 Private by design. No internet permission, no account, no ads, no tracking. Free and open source, in 32 languages.
- 💻 Not only on the phone. Attacca Desktop (Windows, Linux, macOS), a web page and a plugin for Rockbox players chain your music the same way and share what was measured.
It comes in four parts that measure the same way and share what they measured:
| Part | What it is | Where |
|---|---|---|
| Attacca | Music player for Android: chained lists, its own sound processing, themes, Android Auto, and O'rama (the song as a moving landscape). | android/ |
| Attacca Desktop | For the PC (Windows, Linux, macOS): plays music as the phone does (crossfades, sound processing), measures a music library, makes chained lists, exports them for the phone and for players, shows O'rama. Window and command line. | desktop/ |
| Attacca Web | Chained lists in the browser from a library exported by Attacca Desktop. One HTML file, nothing to install. | web/ |
| Attacca for Rockbox | Plugin for Rockbox players: chained lists on the player itself. | rockbox/ |
The phone and the PC exchange their libraries (.attlib: tags, silences, loudness, analysis), so a
collection is measured once. Attacca Desktop exports a compact library (.bpcr2) for the web page
and the Rockbox plugin.
Each release has the Android APK, the desktop installers and packages, the web page and the Rockbox plugin builds. Attacca Web also runs straight from sadurni.github.io/attacca. The Android app is on its way to F-Droid as well.
On the phone
- Install the APK from the latest release (your phone asks once to allow installing from the browser or file manager you open it with).
- Open Attacca and choose the folder that holds your music. Allow access to all files: Attacca plays your folders and playlists where they are.
- A short setup guide follows: let the analysis run in the background (fastest with the phone charging), say how you listen most of the time (headphones, earbuds, car, speaker…) and how one track should give way to the next. It is always at hand again in Settings → Setup guide.
- Play music right away: Music, Folders and Lists work from the start; chained lists, moods and sound families get better as the analysis goes on.
- Make a chained list: open any list and chain it, or choose “Create list from this track” in a track's menu for a list of the tracks closest to it.
The defaults are made to sound right without touching anything. When you want more: Settings opens with the essentials and a search, Sound keeps a profile for each output (a template starts one in a tap, or a guide tunes it step by step by ear on your own music; transitions and volume have their guides too, a check-up says what could be better, and chaining learns your taste by ear), Devices says what each one does when it connects, and the ? opens the help.
On the PC
- Install Attacca Desktop (the
.msion Windows, the.debor.tar.gzon Linux, the.dmgon macOS) and choose your music folder: it is measured once, faster than on the phone. - Export the library (
.attlib) and import it on the phone (Settings → Backup → Import), so the phone does not have to measure it again — or the other way round. - For a Rockbox player, export the library for players (
.bpcr2) and copy the plugin to it; the web page reads the same file.
The changes of each version, for every part, are in CHANGELOG.md; the app shows them in About → What's new.
android/ the Android app (Gradle project)
desktop/ Attacca Desktop (Gradle project, Compose for Desktop)
core/ what both share: analysis, chaining, list making, playlist and exchange formats,
the sound classifier's weights (pure Kotlin, built with each of them)
web/ Attacca Web (a single HTML file)
rockbox/ the Rockbox plugin (C, built against the Rockbox source)
fastlane/ store texts, screenshots and the notes of each version (F-Droid reads them; the app
shows the notes in What's new)
tools/ export_soundnet.py: makes the sound classifier's weights from the published model
docs/ the icon
Building: see each part's README. Versions: one number for every part; version codes of the app are major × 100 + minor × 10 + patch.
Nothing is collected and nothing leaves your devices: see PRIVACY.md. Reports and changes are welcome: see CONTRIBUTING.md.
MIT (see LICENSE), except the Rockbox plugin: GPL v2 or later, as Rockbox plugins are (see rockbox/LICENSE). Third-party components and the YAMNet sound classifier's weights (Apache License 2.0): see NOTICE.