Voxengo SPAN review
A mature free analyzer for spectrum, loudness, metering, correlation and multichannel work.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Voxengo SPAN is a free real-time FFT audio frequency spectrum analyzer plug-in for music and audio production applications. It is designed for producers, engineers and audio professionals who need detailed visual analysis inside a compatible Windows or macOS host. The plug-in supports VST, VST3, AudioUnit and AAX formats, making it suitable for workflows built around common host environments. Its core views cover spectrum, loudness, level, RMS, true peak, clipping, correlation and mid/side analysis.
The analysis depth is its main strength. SPAN combines FFT frequency visualization with stereo, mono, mid-side and multichannel analysis, plus internal channel routing and channel grouping. Metering includes EBU R128 LUFS/LU, K-system, RMS, true-peak and clipping statistics, while stereo correlation provides another way to inspect the signal. Spectrum smoothing, configurable display modes, preset management, undo/redo and A/B comparison add control for repeated analysis work. This makes SPAN a strong fit for users who want more than a basic frequency display without adding a software cost.
SPAN is focused on measurement rather than editing, arrangement or broader production tasks. It also depends on a compatible audio host and plug-in format, so it suits established DAW-based workflows better than users seeking a standalone analyzer. The single Free plan keeps the offering straightforward: its listed capabilities include the full set of FFT, loudness, level, routing and comparison functions described for the product. Choose SPAN for free spectrum and metering analysis across stereo, mid-side and multichannel material. Choose another tool if you need standalone operation or audio editing features in the same application.
Voxengo SPAN pros and cons
- Where it wins
- Real-time FFT, spectrum smoothing and configurable display modes
- Stereo, mono, mid-side and multichannel analysis with channel routing
- EBU R128, K-system, true-peak, clipping and correlation metering
- Where it doesn't
- Requires a compatible audio host rather than operating as a standalone tool
- Analysis-focused feature set does not include audio editing functions
- Available as a single Free plan without tiered workflow options
Voxengo SPAN fact sheet, pricing and score →
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