Get your music onto your offline device.
In three taps.
A focused desktop tool for swim headphones, USB MP3 players, and the other devices that don't stream. Pick the device. Sync your library. Copy. That's it.
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Knows your device
Detects Shokz OpenSwim, FINIS Duo, and generic USB MP3 players. Filters formats per device automatically.
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Preserves order
For transmission-time devices like Shokz, tracks land in the order you want — not the order the filesystem felt like.
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Smart fit
Library bigger than the device? Pick a strategy, see what gets dropped, then copy.
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Free forever
The desktop app is free, and stays free. Open source under MIT. No telemetry, no DRM bypass, no audio extraction.
First-install notes
Windows: the installer is currently unsigned, so SmartScreen will pop up the first time you run it. Click "More info" → "Run anyway". (Code signing is on the roadmap once the project has more users.)
macOS: right-click the app the first time and choose "Open" to bypass the Gatekeeper warning. Notarization will land soon.
Linux: AppImage — make it executable (chmod +x) and run.