Spectrum Analyzer

Professional FFT spectrum analyzer with LUFS metering

Available Now
Spectrum Analyzer screenshot

Spectrum Analyzer is a professional real-time FFT spectrum analyzer with comprehensive metering, completely free.

Overview

Insert Spectrum Analyzer on any track or bus to see a detailed frequency spectrum, loudness readings, true peak levels, and stereo correlation at a glance. All settings are accessible via the gear icon, keeping the main display clean and maximized.

Features

FFT Spectrum Display

Real-time frequency analysis with selectable resolution (2048, 4096, or 8192 samples). Adjustable smoothing, slope compensation, and display range. Optional peak hold overlay with configurable decay rate.

LUFS Loudness Metering

EBU R128 compliant loudness metering with Momentary (400ms), Short-term (3s), Integrated (gated), and Loudness Range (LRA) readings. Integrated LUFS is highlighted for quick reference.

True Peak Detection

ITU-R BS.1770-4 compliant true peak detection with 4x oversampling. Visual clip indicator shows red when levels exceed 0 dBTP.

Stereo Correlation

Visual correlation meter ranging from -1 (out of phase) to +1 (mono). Color-coded bar (green/yellow/red) for instant stereo field assessment.

Channel Routing

Analyze in Stereo, Mono, Mid, or Side modes directly from the header dropdown.

Installation

Platform Format Location
Linux VST3 ~/.vst3/
Linux LV2 ~/.lv2/
macOS AU ~/Library/Audio/Plug-Ins/Components/
macOS VST3 ~/Library/Audio/Plug-Ins/VST3/
Windows VST3 C:\Program Files\Common Files\VST3\

Open Source

Spectrum Analyzer is free and open source. Source code is available on GitHub.

Features

  • Real-time FFT spectrum display (2048/4096/8192 resolution)
  • LUFS metering (Momentary, Short-term, Integrated, LRA)
  • True peak detection (ITU-R BS.1770-4)
  • Stereo correlation meter with visual bar
  • K-System metering (K-12, K-14, K-20)
  • Mid/Side and Left/Right channel routing
  • Adjustable smoothing, slope, decay, and display range
  • Peak hold with configurable decay rate
  • Resizable UI with persistent window size

Changelog

v1.0.0 2026-04-15

  • Initial release
  • FFT spectrum display with 2048/4096/8192 resolution options
  • LUFS loudness metering (EBU R128 compliant)
  • True peak detection (ITU-R BS.1770-4 compliant)
  • Stereo correlation meter
  • K-System metering support
  • Channel routing (Stereo, Mono, Mid, Side)
  • Settings overlay for analysis parameters
  • Resizable UI