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SotF

Free#3 of 22 in Audio Equalizer Software

SotF: Free, open-source EQ and room-correction software for cross-platform audio workflows. Ranked #3 of 22 in Audio Equalizer Software by our editors (9.1/10); pricing: Free plan; best for cross-platform room and headphone EQ workflows.

9.1/10Editor score

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SotF9.1 Visit SotF

At a glance

Editor score
9.1 / 10
Pricing
Free plan
Best for
Cross-platform room and headphone EQ workflows
Free plan
Yes
Paid from
Free
Facts checked
21 Sep 2026

Where it wins
- Free and open-source across Windows, macOS, and Linux
- Measurement-based room EQ plus headphone target-curve optimization
- Exports to CamillaDSP, Equalizer APO, EasyEffects, Wavelet, PipeWire, and Roon
Where it doesn't
- System-wide routing through a HAL driver is limited to macOS
- The broad processing toolkit may exceed the needs of simple EQ users
- Surround upmixing is specified up to 9.1.6 Atmos

Our verdict on SotF

SotF is a free, open-source desktop application for music playback, equalization, room correction, headphone optimization, and audio processing. It supports FLAC, MP3, AAC, ALAC, Vorbis, and other common formats, while its Windows, macOS, and Linux availability suits listeners, headphone users, speaker owners, and audio enthusiasts working across desktop platforms. The visual plugin rack adds graph editing and A/B comparison, and the application includes a terminal interface for users who prefer command-line control.

Its strongest case is the depth of its audio workflow. SotF combines parametric and other equalizer plugins with measurement-based room EQ, speaker optimization, and headphone EQ using target curves. It also supports stereo-to-surround upmixing up to 9.1.6 Atmos. On macOS, a HAL driver provides system-wide audio routing, extending processing beyond music playback. That combination makes SotF a fit for listeners who want local, real-time processing and a single environment for room and headphone work rather than a narrowly focused equalizer.

The ecosystem is another practical advantage. SotF can export configurations to CamillaDSP, Equalizer APO, EasyEffects, Wavelet, PipeWire, and Roon, allowing its work to connect with several established audio environments. The trade-off is that system-wide routing is described specifically for macOS, while the broad feature set and terminal interface may require more audio knowledge than a basic EQ utility. Choose SotF if measurement-based optimization, target curves, cross-platform support, and export options matter. Choose a simpler equalizer if you only need quick tone adjustments without room, headphone, routing, or surround workflows.

Your product? Our editors can test SotF in depth and publish a review, labelled as paid · from $149/mo →

SotF pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on sotf.spinorama.org

SotF fact sheet

Free plan	Yes
Paid from	Free
System-wide control	Yes
Per-app controls	Not verified
Parametric EQ	Yes
Device profiles	Not verified
Desktop operating systems	Both
EQ band count	Not verified
Deployment	Desktop
Platforms	Windows, macOS, Linux
Support	Community, Docs
Built for	Solo, Small business (editorial estimate)
Integrations	6 integrations: CamillaDSP, Equalizer APO, EasyEffects, Wavelet, PipeWire, Roon
Pricing	Free plan
Website	sotf.spinorama.org
Facts checked	21 Sep 2026

SotF integrations

SotF lists 6 integrations on its own site.

CamillaDSP
Equalizer APO
EasyEffects
Wavelet
PipeWire
Roon

Alternatives to SotF

See all SotF alternatives →

SotF vs the competition

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Featured on iTechGuides

SotF is listed in our Audio Equalizer Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update