Voxengo SPAN

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Score6.9

Rank#7 of 42

PriceFree

Free planYes

Runs onmacOS, Windows

Summary

Voxengo SPAN is a free real-time FFT spectrum analyzer plugin for audio and music production applications. It analyzes stereo, mono, mid-side and surround signals, including 5.1 and 7.1 configurations. Metering covers EBU R128 and K-system readings, RMS and true-peak levels, clipping detection and stereo correlation. Users can adjust FFT block size, window overlap, visual slope and smoothing, and view spectra from two channels or channel groups at once. Additional features include channel routing and grouping, output power statistics, presets, undo and redo, and A/B comparisons. SPAN is available for Windows and macOS in VST, VST3 and AAX formats; AudioUnit is also listed for Mac. The maker lists Windows XP and later and macOS 10.12 and later, with a 2.5 GHz dual-core or faster processor and at least 4 GB of RAM. Importing and exporting spectra for track comparisons is a SPAN Plus feature; the free-plugin workaround is limited to some hosts.

Who it is for

SPAN suits audio producers who want real-time frequency analysis and level metering inside a compatible plugin host. Its surround, mid-side and multi-channel options may help with more complex signal checks.

What is good

Free real-time spectrum analysis plugin.
Includes EBU R128 and K-system metering.
Analyzes mono, stereo, mid-side and surround signals.
Supports VST, VST3, AudioUnit and AAX formats.

What to know first

Spectrum import and export is a SPAN Plus feature.
Free-plugin comparison workaround works only in some hosts.
Requires a compatible plugin host.

Verdict

SPAN combines spectrum views with several metering tools in a free plugin. Check its format and system requirements, and note that spectrum import and export is reserved for SPAN Plus.

Voxengo SPAN plans and pricing

All plans

Voxengo SPAN Free Free real-time FFT spectrum analyzer plugin voxengo.com · 3 Oct 2026

Compared on audio analysis software

Free plan: Yesvoxengo.com
Real-time analysis: Yesvoxengo.com
Loudness standards: Yesvoxengo.com
Plugin support: vstvoxengo.com
Analysis views: spectrum, loudness, level, RMS, true peak, clipping, correlation, mid/sidevoxengo.com

Facts

Purpose: SPAN is a free real-time FFT audio frequency spectrum analyzer plugin for professional audio and music production applications.voxengo.com · 3 Oct 2026
Analysis modes: It provides stereo, mono, mid-side, and surround spectrum analysis, including 5.1 and 7.1.voxengo.com · 3 Oct 2026
Metering: It includes EBU R128 and K-system metering, RMS and true-peak level measurement, clipping detection, and a stereo correlation meter.voxengo.com · 3 Oct 2026
Spectrum controls: Users can set FFT block size, window overlap, visual slope, secondary spectrum display, and visual smoothing.voxengo.com · 3 Oct 2026
Multi-channel features: SPAN supports multi-channel analysis and can display spectra from two channels or channel groups at the same time.voxengo.com · 3 Oct 2026
Additional features: The feature list includes spectrum smoothing, resizable interface, output signal power statistics, channel routing and grouping, preset management, undo/redo, and A/B comparisons.voxengo.com · 3 Oct 2026
Plugin formats: The maker lists VST, VST3, AudioUnit, and AAX compatibility.voxengo.com · 3 Oct 2026
Host integrations: Listed compatible hosts include Ableton Live, Cubase, Logic Pro, REAPER, Pro Tools, FL Studio, Studio One, OBS, Bitwig Studio, Nuendo, and Adobe Audition.voxengo.com · 3 Oct 2026
System requirements: The maker specifies Windows XP, Vista, 7, 8, 10 and later, and macOS 10.12 and later, with a 2.5 GHz dual-core or faster processor and at least 4 GB of RAM.voxengo.com · 3 Oct 2026
Downloads: Separate Mac and Windows downloads are offered; the product page lists AU, AAX, and VST3 for Mac and VST, VST3, and AAX for Windows.voxengo.com · 3 Oct 2026
Support: Voxengo says customer support issues are handled as soon as possible and directs users to its product-specific Q&A before contacting staff.voxengo.com · 3 Oct 2026
Known limitation: Voxengo says importing and exporting spectra for easy track comparisons is a SPAN Plus feature and that the free plugin method works only in some hosts such as Ableton Live.voxengo.com · 3 Oct 2026
Privacy and security: Voxengo's site privacy policy says it anonymizes IP addresses before storing them in its long-term database and uses security technologies and procedures to help protect personal information.voxengo.com · 3 Oct 2026
Maker and history: Voxengo says it is privately owned by Aleksey Vaneev and began as a full-time commercial endeavor in December 2002; the page does not state a headquarters location.voxengo.com · 3 Oct 2026