Semper for macOS audio.

Name

Semper

Category

Per-app volume mixer, audio router, and equalizer

Platform

macOS 15.4 or later

Interface

Native SwiftUI menu-bar app

Audio engine

Core Audio process taps and device APIs

License

GNU GPL version 3 only

Maintainer

Nihar Manchikakapudi

Release status

Source available, no packaged public release

Semper creates independent controls for audio-producing Mac processes. Volume, mute, boost, balance, a 10-band EQ, and output routing are attached to the app they affect.

Device features include output selection, device-aware volume control, AutoEQ headphone correction, and ISO 226 equal-loudness compensation. Available controls depend on the active hardware.

Semper does not require an account. Tapped app audio is processed in memory on the Mac and is not intentionally saved or uploaded to Semper maintainers.

Screen & System Audio Recording permission is required for Core Audio process taps. Microphone permission supports input monitoring. Accessibility permission is optional and supports media-key control.

See the full privacy policy for local storage and network-request details.

• There is no signed public DMG or stable release yet.
• Some DAWs, calling apps, and tools with custom audio engines may not work with Core Audio process taps.
• Semper is not available for Windows, Linux, or iOS.
• Hardware volume, balance, routing, and boost availability can differ by audio device.

Semper welcomes focused pull requests for Swift, SwiftUI, Core Audio, tests, accessibility, device compatibility, and documentation. New contributors can begin with a task that has a written scope and acceptance checks.

Start with the starter issue list, read the contributor guide, check the roadmap, or ask a question in GitHub Discussions.

Find a starter issue