Precision EQ plug-in with up to 24 bands, dynamic EQ, and spectral dynamics processing.
VST3supportedAUsupportedAAXsupportedCLAPsupportedWINsupportedMACsupportedLNXnot supported
Checked September 2026
FabFilter Pro-Q 4 vs SPAN (2026)
FabFilter Pro-Q 4 is best for surgical and creative equalization with a fast visual workflow; SPAN is best for visual frequency and loudness analysis while mixing or mastering. FabFilter Pro-Q 4 starts at $199 one-time and SPAN at Free.
Free real-time FFT spectrum analyzer for professional mixing and mastering.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported
| FabFilter Pro-Q 4 | SPAN | |
|---|---|---|
| Best for | surgical and creative equalization with a fast visual workflow | visual frequency and loudness analysis while mixing or mastering |
| Starting price | $199 one-time | Free |
| Free version | No | Yes |
| Free trial | Yes | — |
| Formats | VST3, AU, AAX, CLAP | VST3, AU, AAX |
| OS | Windows, macOS | Windows, macOS |
| Key features | Up to 24 EQ bands with multiple filter shapes, Dynamic EQ mode with adjustable attack/release, Spectral dynamics processing, Dolby Atmos support up to 9.1.6, EQ Sketch for freehand curve drawing | FFT spectrum analysis with adjustable block size and overlap, Multi-channel analysis (stereo, mono, mid-side, 5.1/7.1), Stereo correlation metering, EBU R128 and K-system loudness metering, True peak detection and clipping indicator |
| Developer | FabFilter | Voxengo |
Questions people ask
FabFilter Pro-Q 4 starts at $199 one-time; SPAN starts at Free.
Up to 24 EQ bands with multiple filter shapes, Dynamic EQ mode with adjustable attack/release, Spectral dynamics processing, Dolby Atmos support up to 9.1.6, EQ Sketch for freehand curve drawing.
FFT spectrum analysis with adjustable block size and overlap, Multi-channel analysis (stereo, mono, mid-side, 5.1/7.1), Stereo correlation metering, EBU R128 and K-system loudness metering, True peak detection and clipping indicator.