SIR Audio Tools SpectrumAnalyzer review
A capable free analyzer plugin with a $39 full edition for deeper metering and routing.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
SIR Audio Tools SpectrumAnalyzer is a desktop audio plugin for producers, engineers, and other DAW users who need spectral and metering information during audio work. It is available for Windows and macOS in VST, VST3, AU, and AAX formats, making it suitable for compatible DAW-based workflows rather than standalone operation. Its core analysis options include FFT spectrum analysis and an analog-style parallel band-pass engine, with multiple analyzer display slots for viewing different signals or configurations.
The pricing structure is straightforward. The Free Version provides the free edition of the SpectrumAnalyzer plugin. The Full Version costs $39 USD as a one-time purchase and provides the full SpectrumAnalyzer plugin; a license key is required. The vendor also displays EUR pricing, and VAT may apply. This gives users a direct way to start with the free edition and move to the paid version when the complete feature set is needed.
Its broader feature set suits detailed DAW monitoring: auxiliary audio routing between plugin instances, snapshots, freezing, presets, peak detection, RMS and VU metering, and stereo correlation measurement. Mono, stereo, and stereo mid/side channel configurations add flexibility for different channel layouts. The main limitation is its plugin-only format, so it depends on a compatible DAW host. It also does not provide loudness standards analysis or AI features. Choose SpectrumAnalyzer for free access to spectrum analysis with a clear upgrade path; choose an alternative if you need standalone operation or loudness-standard workflows.
SIR Audio Tools SpectrumAnalyzer pros and cons
- Where it wins
- Combines FFT and analog-style parallel band-pass analysis
- Supports mono, stereo, and stereo mid/side configurations
- Works in VST, VST3, AU, and AAX formats on Windows and macOS
- Where it doesn't
- Requires a compatible DAW host
- Full feature set costs $39 one-time
- Does not provide loudness standards analysis
SIR Audio Tools SpectrumAnalyzer fact sheet, pricing and score →
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