EqLume

EqLume is a small menu-bar app that equalizes all of a Mac's audio in real time. In automatic mode it reads what's playing — Spotify, Apple Music, supported browsers — and switches to a matching genre profile, with a live spectrum and the active curve on screen. Audio is processed in memory, never recorded or uploaded. It's free, with no ads or tracking.

System audio is captured with a Core Audio process tap and a private aggregate device, run through AVAudioUnitEQ and played to the real output — no virtual driver, no kernel extension. Genre comes from MusicBrainz votes, then the iTunes catalogue, then (in the open-source build) an on-device CoreML classifier. Every preset is one measured headphone baseline plus a small genre adjustment, cuts only, with a limiter after the EQ, and each output device keeps its own profile. It builds with plain swiftc from one source tree into two flavours, and idles at about 1.4% of one core.