reTONE beta turns old Android phones into dedicated music players
The free app from Iida Piano outputs straight to a USB DAC at the source sample rate, and a 0.90.1 beta APK is available now.
Iida Piano released the first version of reTONE, a free app that turns Android smartphones into dedicated music players, on October 23, 2026. The build, numbered 0.90.1 beta, is distributed as an APK downloaded from the app's introduction site and runs on Android 4.0 and later phones and tablets, according to av.watch.impress.co.jp.
The app uses its own C-based engine to talk directly to a USB DAC and output tracks at their original sample rate. It also handles DSD playback: files are sent as native DSD to DACs that allow volume control over USB, and converted to PCM for other devices.
Two devices running reTONE can be paired over Bluetooth, letting a newer phone act as a remote control for an older one. A feature that lines up tracks from DLNA NAS drives and other reTONE devices in the same library is switched off by default.
Iida Piano says it verified bit-perfect output in a test pairing a 2012 Xperia P with an OPPO HA-2 DAC, finding the data sent to the DAC matched the source file with no bit differences. The company plans to show reTONE at its booth at the Autumn Headphone Festival 2026 on November 7.
Quick answers
What Android versions does reTONE support?
The 0.90.1 beta runs on Android 4.0 and later smartphones and tablets.
How do I install reTONE?
It is distributed as an APK file downloaded from the app's introduction site.
Does reTONE support DSD playback?
Yes. It sends native DSD to DACs that allow volume control over USB and converts to PCM for other DACs.