Live window previews

Preview windows on hover before you switch (requires Screen Recording permission).

Live window previews

Live previews are the “real thumbnails” inside window previews - captured from your actual windows while you hover.

They’re great when you have multiple windows of the same app and you want to pick the right one without switching blindly.

Requirements

macOS requires Screen Recording permission for window previews:

After enabling it, quit and relaunch the app.

Also make sure previews are enabled in Taskbar settings:

What “live” means (what to expect)

  • Thumbnails are captured on demand when the preview panel opens.
  • The first time you open previews after launch, thumbnails may appear a moment later (they load progressively).
  • Thumbnail size adapts to your Taskbar size (S/M/L), so the panel stays readable without getting huge.

Details that matter

  • A minimized window is marked as Minimized in the preview panel and dimmed so you can spot it immediately.
  • The preview panel only needs to be open for a moment - it’s meant to be “hover → click → go”.
  • Hover Peek (window.peek): Hovering a thumbnail for 180ms temporarily brings that window to the front so you can inspect it on your desktop without committing focus; moving the cursor away restores your previous window.
  • Inline Window Snap (Left 50%, Right 50%, Maximize, Center 70%): Hovering any snap button inside a preview card projects a translucent Snap Ghost Overlay (#/snapPreviewOverlay) on your desktop before you click.
  • Live Picture-in-Picture (PiP) Clone: Click the PiP button on any window card to pop out a floating, always-on-top live clone (window.pip.toggle) that streams at 30fps and supports drag-to-resize.
  • 1-Click Window Screenshot: Click the Camera icon (window.screenshot) to capture a clean PNG of that specific window without background clutter.
  • Per-Window RAM Badge & Instant Filter: View real-time memory usage (window.memory.get) in the header, and when an app has 3 or more open windows, use the built-in search bar and keyboard arrows (← / → / Enter) to filter and jump to the exact window.
  • Middle-Click to Close: Middle-click anywhere on a preview thumbnail card to close that window immediately without activating it.

When it’s most useful

  • You have many browser windows and need the right one.
  • You’re juggling chats + docs + code and want to confirm context first.

Troubleshooting

If thumbnails are blank or never appear:

  1. Confirm Show window previews on hover is enabled: Window previews
  2. Confirm Screen Recording is granted for Sulguni: Screen Recording
  3. Quit and relaunch the app after changing permissions.

More: Live previews are blank

Next steps