Free, open-source real-time audio metering for Windows & macOS

Peak·Loudness·Vectorscope·Spectrum·Spectrogram

PLVS
App Screenshot
Features
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System Audio

Native system audio capture

Monitor any audio playing on your machine — no virtual audio cable required. Windows uses WASAPI loopback, macOS uses the native audio tap.

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Workspace

Fully flexible layout

Drag any divider to resize panels. Rearrange your workspace with split-tree layout. Pop out individual meters to float on a second screen.

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History

Session history & snapshots

Scroll back through the loudness history timeline. Click any moment to freeze all meters at that snapshot — then return to live with one click.

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Multichannel

Multichannel support

Works with stereo and surround formats. Automatic channel layout detection with proper per-channel metering and ITU-R BS.1770 loudness for multichannel sources.

System Requirements
Windows
OSWindows 10 / 11
InstallerNSIS .exe
System audioWASAPI loopback
macOS
ArchitectureApple Silicon
InstallerDMG (aarch64)
System audiomacOS 14.2+
Installation
macOS — Gatekeeper

PLVS is not notarized by Apple. If macOS blocks the app on first launch, run:

xattr -cr /Applications/PLVS.app
Windows — SmartScreen

If Windows SmartScreen blocks the installer, click More info → Run anyway.