AutoVolume is a free, open-source Mac utility that enforces a user-defined volume level every time your audio output changes, saving you from the jarring blasts or near-silent sessions that plague hot-plugging headphones, docking stations, and Bluetooth speakers.
What is AutoVolume?
AutoVolume is a lightweight macOS background tool that watches for system audio events and immediately snaps your volume back to a target level you choose. It lives quietly in the background with no menubar icon and no UI to babysit — set your preferred level once, let it run, and forget it exists until you realise you haven't fumbled for the volume keys in weeks.
The project is hosted on GitHub and distributed via Homebrew Cask, which makes installation and future updates painless for anyone already living in the terminal.
What does AutoVolume do best?
AutoVolume excels at eliminating the audio-level amnesia that macOS inflicts every time you switch output devices. I use a pair of USB-C monitors that each remember their own volume history, and before AutoVolume my day started with a lottery: plug in, get blasted at 100 %, scramble for the keyboard. Now it just works — every device swap lands at the same comfortable level.
- Automatic enforcement: volume is corrected the moment macOS registers an output change, not on a timer.
- Zero ongoing attention: no dashboard, no notifications, no preferences window to revisit.
- Homebrew-native install: brew install --cask autovolume and you're done.
- Tiny footprint: sits in the background consuming negligible CPU and RAM — it's not a menu-bar app or an Electron wrapper.
Is AutoVolume free?
Yes — AutoVolume is completely free to download, use, and modify. The source code is publicly available on GitHub under an open-source licence, so you can audit exactly what it does before trusting it with system-level audio access. There is no paid tier, no freemium upsell, and no account required.
Who should use AutoVolume?
AutoVolume is the right tool if you regularly switch audio outputs and find macOS's habit of remembering per-device volumes more annoying than helpful. That covers a wide slice of power users: developers who plug into a monitor at a desk and then grab headphones for calls, music producers who A/B between studio monitors and earbuds, and anyone who connects a TV or projector for occasional presentations and dreads the volume spike when they disconnect.
It is not for you if you deliberately want different devices to remember different levels — AutoVolume enforces a single global target, which is a feature or a limitation depending entirely on your workflow. Users who want per-device volume memory with a polished GUI should look at Sound Control or Boom 3D instead, both of which offer per-app and per-device granularity at the cost of a subscription.
How does AutoVolume compare to Sound Control?
Sound Control (by Staticz) is the heavy-weight champion of Mac audio management: per-application volume, per-device equalisation, Bluetooth codec switching. It costs around $39 and targets audiophiles and professionals who want to shape every aspect of their audio stack. AutoVolume does exactly one thing — enforce a target volume on device switch — and does it for free. If you don't need the extra horsepower of Sound Control, AutoVolume is the disciplined minimalist choice. The two tools can even coexist, though you'd want to be deliberate about which one "wins" when a device event fires.
Against Apple's own Shortcuts automations (which some users cobble together to reset volume), AutoVolume is more reliable because it hooks into audio events at a lower level rather than relying on shortcut triggers that can miss rapid successive changes.
What are the best AutoVolume alternatives?
Depending on how much complexity you want:
- Sound Control — per-app, per-device, EQ. Paid. The professional option.
- Boom 3D — system-wide EQ with volume boost. Paid. Better for audio quality than discipline.
- Silenz — menu-bar volume widget. Free tier. More manual than automatic.
- Apple Shortcuts automation — free, built-in, but brittle for audio-event triggers.
- AirBuddy — Bluetooth device management with connection animations; tangential to volume but popular in the same audience.
For the specific problem AutoVolume solves — stop macOS from surprising me with a different volume every time I change output — none of the free alternatives match its focus.
