← Blog · March 8, 2026 · 5 min read
Why Open Source Matters for Hearing Protection Software
When you install a tool that runs in your system tray, monitors your audio output, and has the ability to modify your system volume, you are granting it a meaningful level of access to your computer. You are also placing trust in it — trust that it does only what it claims, that it doesn't transmit data, that it doesn't log your listening habits, and that its behaviour is what the developer describes.
With closed-source software, that trust is taken entirely on faith. You have no way to verify any of those claims. With open-source software, the verification is available to anyone willing to look.
What Audio Monitoring Software Can Access
An application that monitors system volume levels can, in principle, do much more than read a number. Depending on how it is implemented, such an application could:
- Log volume levels over time and transmit that data to a remote server.
- Detect when specific applications are playing audio (correlating app usage with volume).
- Intercept audio streams rather than just reading aggregate volume levels.
- Collect system telemetry incidentally, as part of its monitoring routines.
None of the above would necessarily be visible from outside the application. A closed-source tool that claims to "protect your hearing" could implement any of these patterns without disclosing it — and users would have no straightforward way to know.
What Open Source Provides
Open source software publishes its complete source code. Anyone can read it, compile it independently, compare the compiled binary to the published source, and verify that the claims made about the software's behaviour are accurate.
This doesn't mean every user will audit the code. Most won't. But the audit is possible — and the knowledge that it is possible acts as a meaningful deterrent against exactly the kinds of behaviour described above. Developers of open-source software cannot easily hide malicious or privacy-invasive features because any competent reviewer could find and publicise them.
The Reproducibility Argument
For security-sensitive software, reproducible builds go further than just publishing source. When a build is reproducible, it means that compiling the publicly available source code produces a binary that is bit-for-bit identical to the binary available for download. This eliminates the theoretical gap between "the source looks fine" and "the binary you download is actually compiled from that source."
For hearing protection software specifically, this level of scrutiny may seem excessive — the stakes are lower than for a password manager or a VPN. But the principle holds: software that has access to your system behaves better in the open than in the dark.
How SoundBrake Approaches Privacy
SoundBrake is MIT-licensed and fully open source. The complete source code is available on GitHub. Anyone can read exactly how it reads volume levels on each platform, what data it writes locally, and what it does — and doesn't do — with network access.
Specifically, SoundBrake:
- Makes no network connections during normal operation. The source code contains no HTTP client calls, no telemetry endpoints, no update-check requests.
- Reads only two values from the audio subsystem: the master volume level and whether audio is actively playing. It does not access audio streams or identify which application is playing audio.
- Writes only two local files: a plain-text log and an optional silence timestamp. Both are readable, both stay on your machine, and both can be deleted at any time.
- Compiles to a self-contained binary with no bundled analytics SDK, no advertising framework, and no background runtime framework.
Choosing Tools You Can Verify
When evaluating any software that runs persistently in the background — particularly one that interacts with sensitive system interfaces like audio, camera, or microphone — preferring open-source options is a reasonable security and privacy practice.
The MIT license under which SoundBrake is released also means you can study, modify, and redistribute it freely. If you want to adjust the warning thresholds, add a new platform, or integrate its functionality into another tool, the source is there.
That kind of transparency isn't just philosophically appealing — it's practically useful, both for users who want to trust what they install, and for developers who want to build on and improve existing work rather than starting from scratch.
Next reading: Best Volume Settings for Safer Headphone Listening →