Mute on unlock
Automatically mutes after your screen is unlocked so your first click does not become an accidental out-loud moment.
macOS menu bar app for Mac auto mute
Default0 is the Mac auto mute app for preventing accidental speaker playback.
Default0 automatically sets your Mac volume to zero during unlocks, output changes, Bluetooth disconnects, Wi-Fi changes, and meeting app launches, so sound does not suddenly play through speakers in meetings, offices, libraries, or shared spaces.
Lightweight macOS menu bar app | Auto launch | Local runtime
Runs on Macs with macOS 13 or later, including both Intel and Apple silicon.
Every rule is designed to prevent unexpected speaker output
A trigger-first system for high-risk transitions on macOS. Each rule can be enabled independently.
Mute on output switch
When the default audio output changes, Default0 mutes immediately to avoid leaks during speaker-headphone transitions.
Mute on Bluetooth disconnect
If a Bluetooth audio device disconnects, audio is muted before it falls back to speaker output.
Mute on Wi-Fi change
When Wi-Fi connects, disconnects, or switches networks, Default0 can trigger mute to prevent connectivity-driven speaker surprises.
Mute on first login
During the first login phase after startup, mute is applied to reduce accidental playback risk.
Mute on app open
Set high-risk apps such as meeting, video, social, or entertainment apps to auto-mute when they become active.
When Default0 matters most
Back-to-back meetings
Moving from one call to another? Avoid sudden speaker playback from meeting apps or browser tabs.
Open offices and public spaces
In coworking spaces and libraries, a single accidental playback can be immediately noticeable.
Unstable headphone connections
When Bluetooth headphones randomly disconnect, Default0 mutes before audio jumps to speakers.
Heavy multitasking
If you constantly switch apps, devices, and lock-unlock states, automation prevents missed mute states.
FAQ
Will Default0 consume a lot of system resources?
No. It is built as a lightweight menu bar utility focused on low daily overhead.
Can I enable only selected rules?
Yes. Every auto-mute rule can be enabled or disabled independently.
Can I set specific apps to trigger mute?
Yes. You can select one or more apps and mute automatically when they become active.
Can it launch at startup?
Yes. You can enable launch at startup in settings.
What if I do not want it active all the time?
You can pause protection with one click and resume anytime.
Does it support multiple languages?
Yes. It supports Simplified Chinese, English, Japanese, Korean, German, Spanish, and more.
Don’t wait for accidental playback.
Hand over mute-risk moments to Default0 from now on.
Download Default0
For macOS | Menu bar app | Ready out of the box
Contact
Need help or business contact? Reach us by email.