EQer is a system-wide 10-band equaliser for macOS that processes audio from every app in real time. Each application gets its own audio tap, allowing per-app EQ curves and settings. Choose from 22 built-in presets, drag the curve to create custom profiles, or paste your audiogram data to have EQer calculate the optimal listening curve for your hearing. A dynamic range compressor evens out quiet and loud sounds with a brickwall limiter to prevent clipping. The app runs from the menu bar with one-click toggle, uses under 30 MB of memory, and fits in under 1 MB.
