A volume slider for every app on your Mac
Turn the call up and the music down without touching either app. Every app that plays sound gets its own slider from 0 to 150 %, remembered across launches, with no audio driver to install.
A volume slider for every app.
Turn the meeting up and the music down without touching either app. Every app playing sound gets its own slider, 0 to 150 %, plus mute. No audio driver to install.
- Remembered per app. Set Slack to 40 % once and it stays there across launches. Mute all but one, or play an app through another output.
- “Mic in use by Zoom.” See which app has the microphone, read from Core Audio with no permission prompt.
- Devices and levels. Output and input pickers, master volume and balance, and live level meters you can turn on.
- Asks only when needed. Built on Core Audio process taps (macOS 14.2+). The System Audio Recording permission is requested the first time you move a slider, never just for opening the tab.
0–150 %, per app
Each app gets a slider with a 100 % notch it snaps to, mute and a live level meter. Helpers are grouped into their app, and WebKit audio counts as Safari.
Remembered
Set Slack to 40 % once and it stays there across launches. You can even set an app’s level before it starts playing.
Route and isolate
Right-click an app to mute all but it, play it through another output device, or reset it to 100 %.
“Mic in use by Zoom”
See which app has the microphone, read from Core Audio with no permission prompt. Quiet system listeners like Siri’s are shown too.
Devices and levels
Output and input pickers, master volume, mute and balance, input volume, and opt-in level meters.
Recent sounds
The last 10 sounds and which app made them, including that mystery beep and notification sounds.
No driver, nothing to uninstall
Older mixers install a virtual audio device and route everything through it. Stat Space uses the process taps Apple added in macOS 14.2: for an app whose volume isn’t 100 %, is muted or is routed elsewhere, it taps that app’s audio, mutes the original and plays it back at your level through a private aggregate device. The tap is created when the app starts playing and removed 20 seconds after it stops, when it quits, or when you set it back to 100 %.
One honest limit: because there’s no driver in the path, a sound that starts plays at full volume for roughly the first 50 ms before the tap takes over.
Asks only when it needs to
Opening the Volume tab never triggers a prompt. The first time you move a slider, an explanation card appears with an Allow… button, and only that button raises the macOS permission dialog. The input level meter, which actually opens the microphone, is a separate opt-in and asks for Microphone access the first time.
Recent sounds
Ever heard a beep and had no idea which app made it? The Volume tab ends with the last 10 sounds and the app behind each, including system alerts and notification sounds, which macOS plays through a shared system service and normally hides. Turn on “Remember” to keep noting them while the popover is closed.
Quick to reach
Add the speaker item in Settings › Menu Bar to open straight to the Volume tab, or set a global shortcut for it. Listeners run only while the tab is open or some app has a non-default volume.
Questions
Which macOS version do I need?
Per-app volume needs macOS 14.2 or later, which added Core Audio process taps. The rest of the Volume tab works on any macOS 14.
Why does it ask for System Audio Recording permission?
Changing another app’s volume means tapping its audio and replaying it at the new level, which macOS treats as recording system audio. Stat Space asks only after you first move a slider, and macOS shows its purple dot while a tap runs.
Does it cost CPU?
Only for apps you changed, while they play. On an M1 Pro one active tap measured about 0.3 % CPU in Stat Space plus 1–3 % in coreaudiod. Apps left at 100 % cost nothing.
Does it do EQ or audio effects?
No. It’s volume, mute and routing per app. For per-app EQ and effects, a dedicated tool like SoundSource is the better pick.
Know what your Mac is doing, without adding to it.
Free, no account. Pro is $9.99 once for the first 100 buyers.