Head Recorder

Head Recorder — macOS app that records your screen and webcam together as a single video, with the camera composited as a customizable bubble (circle or rectangle, resized, repositioned, and mirrored). Recording and processing happen entirely on-device.

Technical info:

• Written in Swift, SwiftUI + AppKit (~13 source files)
• Screen capture via ScreenCaptureKit (SCStream → AVAssetWriter); camera and mic captured independently via AVCaptureSession / AVCaptureMovieFileOutput
• Live camera bubble rendered in a floating borderless NSWindow (CameraPreviewWindowController) with CAShapeLayer circle/rounded-rect masking, excluded from the screen capture stream itself so it never appears twice
• Post-recording compositing via AVMutableComposition and a custom AVVideoCompositing (OverlayCompositor) — CoreImage radial-gradient-feathered circle mask or rounded-rect mask, affine-transform mirroring, and host-time-offset clock sync between the two source tracks
• Shared OverlayGeometry math drives both the live preview window and the final render, so the preview is what you get
• Zero third-party dependencies — built entirely with native Apple frameworks
• Localized in English and Ukrainian via String Catalogs
• Deployment target: macOS 13.0+