PLVS

Real-time audio metering for listening closely. Free & open source.

PLVS (reads as "plus") is a read-only desktop companion for sound designers and mix engineers on Windows and macOS. It keeps your audio's level, shape, and movement in view while you work — no DAW routing, no virtual cables, no plugin slots. PLVS does not process, route, or modify audio.

• Level Meter, Loudness, Stats, Spectrum, Spectrogram, Vectorscope, Stereo Map, and Waveform in one arrangeable workspace
• System output, a single application, or a physical input, captured natively
• Loudness following ITU-R BS.1770 / EBU R128, with your own Loudness Profiles and optional dialogue-gated readouts
• Multichannel from mono through 9.1.6
• Session history and snapshots, plus File Mode for analysing local audio files
• Dock mode, compact views, and custom themes
• plvs-cli for diagnosing the installation and controlling the running app
• Private: audio stays on your device, with no telemetry by default

Read the User Guide, also published at plvs.soundoer.com/docs.

Get the latest version from GitHub Releases or the website.

Builds are not code-signed or notarized yet. On Windows, choose More info → Run anyway if SmartScreen warns. On macOS, run xattr -cr /Applications/PLVS.app once if Gatekeeper blocks the first launch. See Getting Started for details.

• User Guide — how to use PLVS
• CLI Reference — plvs-cli commands and JSON contract
• CHANGELOG — what changed in each version
• Developer documentation — architecture, product boundaries, and decision records, for maintainers and agents

git clone https://github.com/SounDoer/PLVS.git
cd PLVS
npm install
npm run desktop        # start the development app
npm run check          # the full gate before sending a change

Setup requirements, build and release commands, and conventions are in CONTRIBUTING.md. Contributions are welcome.

PLVS stands on the shoulders of excellent open-source work. In particular:

• Voice activity detection — dialogue-gated loudness can run on any of three selectable on-device VAD engines:
  • Silero VAD (default) — bundled via the voice_activity_detector crate (MIT).
  • FireRedVAD
  • TEN VAD
• CPAL — cross-platform audio capture (Apache-2.0).
• RustFFT & RealFFT — the FFT engine behind the spectrum and spectrogram (MIT / Apache-2.0).
• Rubato — sample-rate conversion (MIT).
• Tauri — the desktop application framework (MIT / Apache-2.0).

Thanks to all the maintainers and contributors of these projects.

PLVS is available under the MIT License. Release packages also include third-party notices and the referenced complete license texts.