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SonicFlow Mac App
Per-app volume for macOS. Free and open source.
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.
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).
About SonicFlow Mac App on Product Hunt
“Per-app volume for macOS. Free and open source.”
SonicFlow Mac App was submitted on Product Hunt and earned 3 upvotes and 2 comments, placing #42 on the daily leaderboard. 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.
On the analytics side, SonicFlow Mac App competes within Mac, Open Source, GitHub and Menu Bar Apps — topics that collectively have 225.3k followers on Product Hunt. The dashboard above tracks how SonicFlow Mac App performed against the three products that launched closest to it on the same day.
Who hunted SonicFlow Mac App?
SonicFlow Mac App was hunted by Fernando Altuzar. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of SonicFlow Mac App including community comment highlights and product details, visit the product overview.
Fernando Altuzar