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When changing displays, the app must be restarted.
SideEye

SideEye

SideEye is a macOS SwiftUI app that lets you keep a sneaky Picture-in-Picture (PiP) preview of your connected monitors. Perfect for presenters, streamers, or anyone who wants to see what’s being shown on an outward-facing screen without constantly turning around.

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Features

  • Monitor Picker – Choose which connected display you want to mirror.
  • Floating Preview Window – Opens a PiP-style window you can resize and keep always-on-top.
  • FPS Control – Switch between 30 FPS (smooth) and 10 FPS (power-saving).
  • SwiftUI + ScreenCaptureKit – Built for macOS 14+, using Apple’s modern capture APIs.

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How It Works

  1. Launch SideEye.
  2. In the main window, use the drop-down menu to select the monitor you want to mirror.
  3. Pick your frame rate:
    • 30 FPS – smoother motion, higher CPU/GPU use
    • 10 FPS – lower motion, more battery friendly
  4. Click “Open Floating Preview”.
  5. A resizable, floating PiP window will appear showing the chosen monitor.
You can drag, resize, and keep the preview on top of all windows—handy for presentations or live demos.

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Requirements

  • macOS 14 (Sonoma) or newer
  • Screen Recording permission for SideEye enabled in System Settings → Privacy & Security → Screen Recording
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