Every app.
Your volume.
Control each app’s volume. All in one place.
One-time setup, so every app that is playing gets its own volume. No computer, no cable — just Wi-Fi for the first run, all on this phone.
What this app does
The usual per-app volume apps switch the whole device volume to match whichever app is in front. LunaMixer sets a separate volume for each app that is playing, all at the same time.
If you have a Galaxy
On Galaxy (Samsung) phones, the built-in "Sound Assistant" may already do this. Trying that first is probably quicker. This app is for phones without an equivalent.
Why does it need a special setup?
Install from Google Play
- Get LunaMixer from Google Play.
- Open the app and tap Start.
- Tap Allow when it asks about notifications.
More about this screen
Notifications have to be allowed. In step 5 you type the six-digit pairing code into this app's notification. Refuse notifications and that box never appears, so setup cannot be finished. If you have already refused, allow it again under Settings → Apps → LunaMixer → Notifications.
Setup is six steps
Reveal the developer menu
- Open About phone.
- Tap Build number seven times.
- Enter your PIN or pattern if you are asked for it.
- "You are now a developer!" means it worked — go back and continue.
Already turned on before? Move straight on.
Turn on developer options
- Open Developer options.
- Turn on the switch at the top.
- Come back to the app and continue.
Connect to Wi-Fi
- Pick the Wi-Fi network to use.
- Wait until it says connected.
- Come back to this app.
Mobile data on its own will not get you past this. It is the one step that will not let you continue until it is done.
Turn on wireless debugging
- Open Developer options.
- Find Wireless debugging under the Debugging heading.
- Turn on the switch beside it (you do not have to open the screen).
If you cannot find it
Enter the six-digit pairing code in the notification
- Open Developer options.
- Wireless debugging → "Pair device with pairing code".
- When the six-digit code appears, pull down the notification shade without leaving the screen.
- On the "Type the six-digit pairing code here" notification, tap Enter, type the code and send.
After you send it the notification reads "Checking the six-digit code", then "Connected / Pairing is done". Come back to the app once it is done.
Allow the bubble to show
- If a list of apps appears, choose LunaMixer.
- Turn the switch on.
- Come back to LunaMixer.
Back in the app, Show bubble can now be tapped.
From here on, it all happens in the bubble.
The sliders open from the bubble floating over your screen, not from the app itself. Next time, all you do is tap Show bubble.
Using it
- Open the app and tap Show bubble.
- Drag the round bubble wherever you want it.
- Tap the bubble to open the list of apps that are playing.
- Move a slider and that app's volume changes as you go.
Most adjustments land between 0 and 30%, so the bottom 60% or so of the slider is given to that range.
To put everything back: tap Stop volume control in the panel, or close both the app and the bubble. Volumes return to normal a few seconds later.
Settings the connection needs
With USB debugging on, the connection survives even after wireless debugging is turned off.
Stays on: a connection that has been made is not dropped. Close the app and it is ready the moment you open it again.
Restart: a dropped connection can be made again with "Turn volume control back on". You need this after both switches have been off.
If something goes wrong
Wireless debugging will not turn on
The notification for the code never appears
The code was sent but nothing connects
It was working, now it says "Not connected"
The volumes went back to normal on their own
One app ignores the slider
If you leave USB debugging on
If it bothers you, turn USB debugging back off when you are not using it. Next time, get on Wi-Fi, turn wireless debugging on, and tap Turn volume control back on.
Licences
This app contains code written by other people. Where it came from, the licence chosen, and the changes made are set out below.
- Apache License 2.0 / full text at the bottom of this pagelibadb-android (Muntashir Al-Islam and others) — used to pair with wireless debugging and connect to it from inside the device. Apache chosen, where GPL-3.0 was the alternative. Modified: package names changed; the SPAKE2 implementation replaced with our own, in place of LGPL-3.0 spake2-java.
Conscrypt (The Android Open Source Project) — used for TLS during pairing. Unmodified.
AndroidX / Jetpack Compose (Google) — used to draw the screens and for the app's basic machinery. Unmodified.
kotlinx.coroutines (JetBrains) — used to get slow work done without stopping the screen. Unmodified.
com.google.android.datatransport (3) / com.google.firebase:firebase-encoders (3) / com.google.guava:listenablefuture / javax.inject / org.jspecify / org.jetbrains:annotations — used internally by the in-app purchase library. Unmodified. - Android Software Development Kit License / text not bundledcom.android.billingclient:billing / billing-ktx — used for the in-app purchase. Unmodified.
com.google.android.gms:play-services-base / basement / location / places-placereport / tasks — used internally by the libraries above; not asked for directly. Unmodified.
Terms at developer.android.com/studio/terms.html - Play Core Software Development Kit Terms of Service / text not bundledcom.google.android.play:review / review-ktx — used to ask for a review from inside the app. Unmodified.
com.google.android.play:core-common — used internally by the libraries above; not asked for directly. Unmodified.
Terms at developer.android.com/guide/playcore/license - Bouncy Castle Licence (MIT-style)org.bouncycastle:bcprov-jdk15to18 / bcpkix-jdk15to18 / bcutil-jdk15to18 — used for key derivation (HKDF), encryption (AES-GCM), and building the certificate used to connect. Unmodified.
Terms at bouncycastle.org/licence.html - Permissive, ISC-style licenceSPAKE2 / edwards25519 (BoringSSL, Google Inc.) — used for the key exchange during pairing. Modified: ported to Kotlin from the BoringSSL C implementation.
- SIL Open Font License 1.1 / full text ships inside the app (assets/fonts/)Zen Kaku Gothic New / Manrope — bundled as the app's typefaces. Unmodified.
Not required by any licence, recorded anyway: Shizuku (RikkaApps). Starting a separate process with shell privileges and taking a Binder from it is a technique Shizuku established. This app uses none of its source and was written independently from published descriptions, so no attribution is required. Putting it in the list above would make that list — the terms this app is under — inaccurate, so it sits here instead.
Show the full text of the Apache License 2.0
Apache License
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http://www.apache.org/licenses/
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