SonicFlow Mac App
Per-app volume for macOS. Free and open source.
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Fernando Altuzar

SonicFlow Mac App - Per-app volume for macOS. Free and open source.

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macOS still doesn't let you control the volume of individual apps. If Spotify is loud, Zoom's ringtone hits you at the same level. SonicFlow is a free, open-source menu bar app that gives you an independent volume slider for every app currently making sound. Plus auto-ducking: when someone speaks on a Zoom or Teams call, your music automatically lowers. Built in Swift 6 with CoreAudio Process Taps (the new low-level API Apple shipped in macOS 14.2). Under 1% CPU, MIT licensed.

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Fernando Altuzar
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Hey Product Hunt 👋 I built this because I got tired of Slack and Zoom shouting over my music. Apple ships per-app volume on iOS but not macOS — there's no public UI for it, even though the low-level APIs exist. SonicFlow uses those APIs (specifically AudioHardwareCreateProcessTap, available since macOS 14.2) to give every app an independent slider. A few details that might be useful: Free and open source (MIT). No paid tier coming. Under 1% CPU, lock-free realtime audio path, allocation-free IOProcs. No microphone permission requested — Process Taps are output-capture, not input. The purple dot never appears. Works alongside your existing audio setup — doesn't change the system default output, doesn't install a virtual driver, doesn't require a reboot. If you've used SoundSource: SonicFlow is a much smaller open-source alternative focused on the per-app-volume use case. SoundSource is still the right buy if you need EQ, audio routing, recording, etc. Code & roadmap: https://github.com/altuzar/sonic... Looking forward to your feedback. Happy to answer technical questions about the CoreAudio side (it was a rabbit hole).
Rivra

Having per app volume controls natively on macOS is an extension that should honestly just be part of the operating system. It is a massive quality of life upgrade for anyone managing background music alongside video calls. Are there options to save specific audio profiles for different workflows?