Volume booster and mixer for Mac
Turn Safari down, keep Spotify up, and boost quiet videos to 400%. Right from your menu bar.
Drag the sliders. The middle mark is 100%.
Up to +12 dB for quiet videos and weak laptop speakers. A limiter keeps it from crackling.
Five bands, so music gets more bass and calls get clearer voices.
Quiet dialogue comes up, explosions come down. Off, Light or Strong.
macOS stops at 100%. calmdoo boosts any app, or everything at once, up to 400% (about +12 dB). A limiter keeps the boosted sound from crackling.
Yes. macOS has one volume for everything. calmdoo adds a slider for each app that is playing sound, so Safari can sit at 40% while Spotify stays at 100%. Each app's setting is remembered.
When the output changes, for example when you plug in headphones, boosts above 100% go back to 100%. A boost meant for quiet laptop speakers never lands in your ears.
No. calmdoo uses the audio taps built into macOS, so there is no driver or kernel extension. If calmdoo quits, every app plays at its normal volume again.
That permission is what lets calmdoo change other apps' sound. The sound is changed in memory and is never saved or sent anywhere.
Yes, under the MIT license. All of the code is on GitHub.
On first launch, macOS asks once for System Audio Recording. That lets calmdoo change other apps' sound. Sound is never saved or sent.
The download opens with the first public release.