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DisplayPeek

How to use DisplayPeek to see each display's real resolution, refresh rate and scaling on your Mac, and what it can and cannot tell you.

Updated

The question it answers: what display configuration am I actually running?

What you see

One card per connected display:

Field Meaning
Panel resolution The display’s native pixels
Looks like The resolution macOS presents to your apps
Refresh rate The rate macOS reports for the current mode
Scaling Worked out from the two resolutions: native (1×), HiDPI (2×) or scaled
Main, mirrored, online Shown only when macOS reports them
Vendor / product ID, manufactured Identify the panel model and when it was made

Anything else macOS reports about a display appears below as extra detail. If macOS does not report something, DisplayPeek leaves it out instead of guessing. It never infers cable type, HDR or connection protocol.

How to use it

  1. Open DisplayPeek from the launcher. It reads your display configuration when the screen opens.
  2. Press ⌘R after you change a setting or plug in a monitor to read again.
  3. Use the copy button on a card to copy its details for a support thread.

Good to know

  • Serial numbers are never read or shown, so copied details are safe to share.
  • “Rotation: Supported” means the display can rotate, not that it is rotated.
  • A refresh rate below what the monitor advertises usually means a cable, adapter or the selected mode is the limit. See check monitor refresh rate on Mac.

Privacy

Read-only. Nothing runs in the background and nothing is sent anywhere. See permissions.