macOS menu bar app that automatically records audio from your calls.
Detects when your microphone becomes active (e.g. during calls) and records system audio automatically. Works with any app - Zoom, Meet, Teams, Discord, FaceTime, Telegram, and more. Saves M4A files locally.
Download the latest .dmg from Releases, open it, and drag Blackbox to Applications.
On first launch, grant Screen Recording and Microphone permissions when prompted.
- Auto-records when your microphone becomes active (any calling app)
- Manual record/stop for on-demand system audio capture
- Dual-track M4A (system audio + microphone in manual recordings)
- Notification when recording is saved (click to reveal in Finder)
- Configurable grace period, save location, and notification preferences
- Auto-updates
git clone https://github.com/tenequm/blackbox.git
cd blackbox
make install
open /Applications/Blackbox.appRequires macOS 15+ and Swift 6.2+ (Xcode 16+).
Blackbox's ScreenCaptureKit audio capture architecture was informed by studying Azayaka by Martin Persson - a clean, well-built macOS screen and audio recorder. Azayaka's approach to dual-track recording and its PCM buffer conversion patterns (based on Apple's ScreenCaptureKit documentation and this gist by aibo-cora) were valuable references during development.
GPL v3 - see LICENSE