Radioform

Radioform: A free, open-source macOS equalizer

Radioform is a free, open-source macOS equalizer that lets you shape your sound system-wide — with fully parametric per-band control.

It tucks into your menubar and stays out of your way. Pick a preset or craft your own EQ curves for different gear.

Created with C++ and Swift. Learn more here.

GitHub
Step 1

First, Download & install

Step 2

Then, select an audio device

Step 3

Select a preset or make your own

Step 4

Finally, Enjoy

Radioform creates a virtual audio device that sits between your apps and your speakers. All system audio passes through a high-quality DSP engine where it gets shaped by your EQ settings in real-time—then continues to your actual output device. Zero added latency, sub-1% CPU usage.
The audio engine is written in C++ using cascaded biquad filters for precise EQ control. The virtual audio device uses Apple's Audio Server Plugin (libASPL) framework. The menu bar app is native Swift/SwiftUI. Everything talks through a clean C API and shared memory for real-time safety.
Yes. Radioform is released under the GPLv3 license—fully open source, no hidden costs, no subscriptions, no data collection. You can read every line of code, build it yourself, or fork it for your own projects.