An app has no volume control of its own on Mac — how to add one

If an app has no volume slider of its own, you add one from outside the app with a per-app volume mixer that works at the system audio layer. A mixer like Background Music, SoundSource, or Fader gives every running app its own level whether or not the app ships any controls — so the app you couldn't turn down suddenly has a real volume you can set, lower, or mute. macOS provides no per-app volume itself, which is exactly why the control has to come from a separate tool.

It catches people off guard. You go looking for the slider inside a game, a menu-bar utility, or some small native app, and there simply isn't one. No preference, no menu item, nothing. The app plays at whatever level it decides, and the only knob you have is the system volume — which turns down everything at once, your music and calls included. So how do you quiet just that one app when the app itself gives you nothing to grab?

Why some apps ship no volume control at all

A volume slider is not a system feature apps inherit. It's a piece of interface each developer chooses to build, and plenty of them don't bother. When an app plays sound, it hands the audio to macOS at full level and lets the system's single master output do the rest. If the developer never added an internal level control, there is nothing inside the app to move — and macOS won't add one for you.

The apps most likely to have no volume of their own fall into a few buckets: games (especially smaller or older titles that expose only music/SFX toggles, or nothing), menu-bar utilities and background agents, simple native AppKit tools, alert and notification sounds, and some Electron or Java apps that never wired up an audio setting. In every case the audio is real and playing; the interface to tame it just doesn't exist. This is a close cousin of the case where an app has a slider but it barely does anything — if that's what you're seeing instead, read why an app's own volume slider doesn't actually lower it on a Mac.

What doesn't work

The obvious moves all fall short here, because they were never per-app to begin with:

• The volume keys and Control Center. They set one master output level in front of every app. Turn the loud app down and everything else ducks with it.
• System Settings › Sound. There's an output level and a device picker, and that's it. No list of apps, no per-app sliders.
• Waiting for the app to add one. If the developer hasn't shipped a volume control by now, there's no setting hidden in a menu that fixes it. You need the control to come from elsewhere.

The one free thing that sometimes helps: if the app plays through a device you can pick — say it always uses your default output — you can't isolate it there either, because other apps share that same output. There is no built-in path to "just this app, quieter." That gap is the whole reason per-app mixers exist.

The fix: add the control from the OS layer

A per-app volume mixer inserts itself at the macOS audio layer, below the apps. Every app that's making sound shows up with its own fader, and the mixer applies the level you set on the way out — completely independent of whether the app has any interface of its own. An app that shipped zero controls gets a full volume you can ride, and it behaves exactly like an app that came with a slider.

There are three well-known tools that do this, and they're honestly different in feel and price:

All three genuinely solve the "no controls of its own" problem — that's the important part. Background Music is free and open source and will get you a per-app level for nothing; it's a fine place to start if budget is the only thing that matters, though it's a community project without formal support. SoundSource is the most feature-rich of the three, adding per-app EQ and audio effects on top of volume, and it's the right pick if you want a full audio-processing suite. Fader is the keyboard-first option built for people who change levels constantly.

Why the keyboard matters when an app has no slider

Here's the thing about an app with no controls of its own: you're often reaching for its volume precisely because it surprised you — a game jingle blasts, a background app pings, a notification sound is louder than your music. In that moment, speed is the whole point. A menu-bar mixer means move to the menu bar, click the icon, find the row, drag the fader, dismiss. Five actions to quiet one thing.

Fader's approach is to make the keyboard the mixer. You hit a toggle hotkey and the letter keys become faders — one column per app — so lowering or muting the loud app is a single keystroke from inside whatever you're doing. For an app you can't control any other way, having a hotkey mute is the difference between fixing it instantly and hunting for a window that doesn't exist. If you want the broader picture of per-app control on macOS, the guide to controlling individual app volume on a Mac walks through every option.

Does the volume stick?

Because the level lives in the mixer and not in the app, it holds regardless of what the app does. The app has no memory of a volume setting — it never had one — so the mixer is the source of truth. Set the loud game to 40% once and that's where it stays whenever it's playing, no diving back into non-existent settings each time. That's a real upgrade over apps that forget their own level between launches.

Bottom line

When an app has no volume control of its own, the fix isn't hidden in the app or in macOS — neither one is going to give you a slider. You add the control from the outside with a per-app mixer that works at the system audio layer, and any app, controls or not, gets a real volume you can set. If you want that quiet done in a single keystroke the moment a silent-by-default app gets loud, that's exactly what Fader is built for.