No. 4 of 23 ·Audio Equalizer Software

SotF

Windows · Mac · Linux

Freedom report

Three barsScore 6.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

SotF is ranked #4 of 23 in audio equalizer software on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

SotF plans and pricing

All plans

Free Free Free · open source (GPL-3.0) · no subscription sotf.spinorama.org · 30 Sept 2026

Compared on audio equalizer software

Free plan: Yes
System-wide control: Yes
Parametric EQ: Yes
Desktop operating systems: both

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The record

Product: SotF is a free, open-source audio player and optimizer for sound in rooms and headphones.
Music playback: Its music player supports FLAC, MP3, AAC, ALAC, and Vorbis files.
Audio plugins: The product page lists more than 40 audio plugins, including EQ, compression, limiting, upmixing, binaural processing, convolution, and denoising.
Room correction: Room EQ measures and analyzes room response, then calculates correction filters to apply in a plugin chain.
Room EQ equipment: Room correction requires a measurement microphone and its calibration file, in addition to SotF and connected speakers.
Headphone EQ: Headphone EQ calculates parametric filters targeting the Harman curve and supports hundreds of measured headphone models.
Speaker EQ: Spinorama EQ provides correction for thousands of speakers from spinorama.org without requiring a microphone.
Audio export: SotF lists export support for CamillaDSP, Equalizer APO, EasyEffects, Wavelet, PipeWire, and Roon.
System audio: On macOS, a CoreAudio HAL virtual device can route audio from all apps through a configured SotF plugin chain.
Privacy: SotF says it collects no user data and uses no analytics, telemetry, cookies, or tracking.
Local processing: The application runs on the user's machine and does not upload music or listening history; speaker EQ queries the public Spinorama API for the searched speaker model.
Downloads: The download page lists macOS, Windows, and Linux releases, with stable desktop releases through platform stores and beta or command-line builds through GitHub Releases.
Support: Users can submit feedback or bug reports through GitHub and join the AudioScienceReview discussion linked from the product page.
Maker: The site credits SotF to Pierre F. Aubert.
Price from: Free

Where it ranks on Freedom251

Best Audio Equalizer Software in 2026#4 of 23

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Sources

sotf.spinorama.org· checked 30 Sept 2026
sotf.spinorama.org/guides/room-correction/· checked 30 Sept 2026
sotf.spinorama.org/guides/headphone-eq/· checked 30 Sept 2026
sotf.spinorama.org/guides/macos-daemon/· checked 30 Sept 2026
sotf.spinorama.org/privacy/· checked 30 Sept 2026