Radioform: A free, open-source macOS equalizer
Radioform is a free, open source equalizer for your Mac. It quietly shapes the sound of everything you play.
It tucks into your menu bar and stays out of the way. Pick one of the presets, or build your own curve and save it for later.
Built with C++ and Swift. Read more here.
Download Radioform and drag it into your Applications folder. Open it once and it sits in your menu bar.
In your Sound settings, pick the Radioform output that matches your speakers or your headphones. Now your Mac plays through it.
Open the menu bar icon and the EQ is there. Start from a preset, or pull the sliders until it sounds right. Double-click a band for advanced settings. Enjoy.
Radioform makes a virtual audio device that sits between your apps and your speakers. Everything you play runs through the EQ engine, then goes on to your real output. No delay. Under 1% CPU usage.
The audio engine is C++ with cascaded biquad filters. The virtual device uses Apple's Audio Server Plugin (libASPL). The menu bar app is native Swift and SwiftUI. They talk through a clean C API and shared memory, so the audio stays real-time safe.
Yes. It's GPLv3. Fully open source. No cost, no subscription, no data collection. You can read every line of code, build it yourself, or fork it.