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Dusk Audio Spectrum Analyzer
What it is
Dusk Audio Spectrum Analyzer is a free plugin for viewing audio levels and frequency content in real time. Its measurement views cover the spectrum, loudness, true peak, stereo correlation and K-System headroom. The FFT display offers 2048, 4096 and 8192 sample resolutions, with adjustable smoothing and slope and an optional peak hold. Loudness readings cover EBU R128 Momentary, Short-term, Integrated and Loudness Range measurements. True peak detection uses 4x oversampling under ITU-R BS.1770-4, and the stereo correlation meter runs from -1 to +1. Channel views include Stereo, Mono, Mid and Side. The manual describes it as an analyzer that leaves the audio path unchanged, so settings do not alter the input signal. It works in a 64-bit DAW supporting VST3, LV2 or AU. Formats are listed for Linux, Windows and macOS, with minimum OS versions varying by platform. The plugin is free and open source, with source code available on GitHub.
For and against
For
- Free and open source
- Measures spectrum, loudness and true peak
- Offers four channel display modes
- Output remains unchanged by analyzer settings
Against
- Requires a 64-bit DAW
- Linux minimum is Debian 12+, Ubuntu 22.04+ or Fedora 36+
- No free trial is listed
The verdict
Dusk Audio Spectrum Analyzer provides several real-time measurement views and standards-based loudness and true peak readings. Check the DAW, plugin format and operating system requirements before choosing it.
Who it suits
It suits musicians, students, hobbyists and Linux audio users who want measurement views inside a compatible DAW. A 64-bit DAW and supported plugin format are required.
Plans and prices
Free
No trials · no feature limitations · no nag screens
Read 5 Oct 2026 · duskaudio.com
On the record
- Audio path
- The manual says the plugin is a pure analyzer that does not write to the audio path, so its output equals its input regardless of settings.duskaudio.com · read 5 Oct 2026
- Channel modes
- The channel mode can display Stereo, Mono, Mid, or Side.duskaudio.com · read 5 Oct 2026
- FFT display
- The FFT display offers 2048, 4096, and 8192 sample resolutions, adjustable smoothing and slope, and optional peak hold.duskaudio.com · read 5 Oct 2026
- Free and open source
- Dusk Audio says all its plugins are free and open source, with source code available on GitHub.duskaudio.com · read 5 Oct 2026
- Host requirements
- It requires a 64-bit DAW supporting VST3, LV2, or AU; the listed minimums are Debian 12+, Ubuntu 22.04+, or Fedora 36+ on Linux, Windows 10+, or macOS 10.13+.duskaudio.com · read 5 Oct 2026
- Loudness metering
- It provides EBU R128 compliant Momentary, Short-term, Integrated, and Loudness Range readings.duskaudio.com · read 5 Oct 2026
- Maker
- Dusk Audio describes itself as a solo endeavor; the opened About page does not state headquarters or a founding date.duskaudio.com · read 5 Oct 2026
- Plugin formats
- The product page lists Linux VST3 and LV2, Windows VST3, and macOS VST3 and AU formats.duskaudio.com · read 5 Oct 2026
- Purpose
- Spectrum Analyzer is a real-time measurement plugin for viewing frequency spectrum, loudness, true peak, stereo correlation, and K-System headroom.duskaudio.com · read 5 Oct 2026
- Security and compliance
- The product page states EBU R128 and ITU-R BS.1770-4 metering compliance; it does not state security certifications or a privacy policy.duskaudio.com · read 5 Oct 2026
- Support
- Users can report bugs and suggest features through GitHub Issues; financial support is optional.duskaudio.com · read 5 Oct 2026
- True peak and correlation
- True peak detection is ITU-R BS.1770-4 compliant with 4x oversampling, and a stereo correlation meter ranges from -1 to +1.duskaudio.com · read 5 Oct 2026
- Who it is for
- Dusk Audio says it builds for everyone and identifies hobbyists, students, musicians in the open-source community, and Linux audio users as audiences it aims to serve.duskaudio.com · read 5 Oct 2026
