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Product · macOS menu bar app

SoundLock

Your audio. Your rules. Always.

A macOS menu bar app that locks your audio device priority so the right output and input are always selected.

Download SoundLock View on GitHub

Free · MIT license · macOS 13+

Pro audio setups Multi-device Bluetooth Video call mic stability
SoundLock app icon
Overview

macOS constantly reassigns your default audio device on its own logic — plug in a monitor, connect AirPods, join a call, and suddenly the wrong speaker or mic is active. SoundLock ends that.

You rank your output and input devices once. SoundLock listens to CoreAudio device events and instantly restores your top available device whenever macOS tries to switch. Event-driven, no polling, ~20MB RAM and 0% idle CPU.

Features
  • Ranked priority lists with drag-to-reorder
  • Offline persistence across restarts
  • Volume and mute control from the menu bar
  • Guard toggle to lock or unlock at any time
  • Launch at login with zero Dock footprint
  • CoreAudio event-driven: ~20MB RAM, 0% idle CPU
  • Privacy-first: no network, no mic permission, local storage only
Privacy

SoundLock reads zero audio bytes, never requests microphone permission, ships no network code, and stores preferences locally via UserDefaults. No telemetry, no analytics.

Use cases
Best for: anyone tired of macOS switching audio devices on its own
Install

1. Download & unzip

Download SoundLock.app.zip, unzip it, and drag SoundLock.app into your Applications folder.

2. First launch (Gatekeeper)

The app is unsigned. On macOS 14 and earlier, right-click it and choose Open twice; on macOS 15 Sequoia, open System Settings → Privacy & Security → Open Anyway. Or clear the quarantine flag from Terminal:

xattr -dr com.apple.quarantine /Applications/SoundLock.app