Voxengo SPAN
Voxengo SPAN: A mature free analyzer for spectrum, loudness, metering, correlation and multichannel work. Ranked #4 of 43 in Audio Analysis Software by our editors (8.8/10); pricing: Free plan; best for free plug-in spectrum analysis.
At a glance
- Editor score8.8 / 10
- PricingFree plan
- Best forFree plug-in spectrum analysis
- Free planYes
- Paid fromFree
- Real-time analysisYes
- Founded2002
- Facts checked20 Sep 2026
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
Our verdict on Voxengo SPAN
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.
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Voxengo SPAN pricing
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Voxengo SPAN fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Real-time analysis | Yes |
| Offline file analysis | Not verified |
| Loudness standards | Yes |
| Maximum channels | Not verified |
| Plugin support | Vst |
| Analysis views | spectrum, loudness, level, RMS, true peak, clipping, correlation, mid/side |
| Deployment | Desktop |
| Platforms | Windows, macOS |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Pricing | Free plan (source) |
| Website | voxengo.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Voxengo SPAN
- Insight 2A focused metering plug-in for loudness compliance and multichannel audio analysis.9.1
- WLM Plus Loudness MeterA standards-focused loudness plugin for production across major DAWs.9.0
- SmaartA broad measurement suite for live sound, acoustics, and SPL monitoring.8.9
See all Voxengo SPAN alternatives →
Voxengo SPAN vs the competition
- Voxengo SPAN vs Insight 2
- Voxengo SPAN vs WLM Plus Loudness Meter
- Voxengo SPAN vs Smaart
- Voxengo SPAN vs Room EQ Wizard
- Voxengo SPAN vs Youlean Loudness Meter
- Voxengo SPAN vs Sonic Visualiser
Compare Voxengo SPAN with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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