EqualTune

EqualTune is a free, open-source, system-wide audio equalizer for Windows. It processes everything your PC plays, so one EQ works across all your apps, headphones and speakers. System-wide routing uses the free VB-CABLE virtual audio device, and the installer can set it up for you. Features - Basic mode with four tone controls, or Advanced mode with up to 12 parametric bands (frequency, gain, Q and filter shape per band) - Live spectrum behind the EQ curve - 14 built-in presets, plus save, export and share your own - Import and export of Equalizer APO / AutoEq text files, so community headphone profiles work - A separate EQ profile for each output device, and automatic profile switching per app - Auto-preamp, level-matched A/B compare, limiter, channel balance and equal loudness - Global hotkeys, system tray, start with Windows, and Windows volume stays in sync - If EqualTune closes or crashes, Windows sound switches back to your normal output - Built-in update checker Customization - 16 UI skins with adjustable accent color, text, marker shape, curve style, corners and spacing, plus colorblind-safe band colors - Your own background image, built-in fonts or your own font file - Save your look as a custom skin and share it as a file Notes - Windows only for now. A Linux version is planned. - It doesn't affect apps that send audio in exclusive mode or through ASIO. - The installer isn't code-signed yet, so Windows SmartScreen may show a warning. - EqualTune was built almost entirely with AI tools (ChatGPT and Claude), directed and tested by its maintainer. Community: reddit.com/r/EqualTune