Mac Duo: your screen moves with the lid

Mac Duo gives closing your MacBook a visible transition. As the lid comes down, the picture on the built-in display narrows and recedes toward its top edge, with depth, blur and fading light. Open the lid and the picture returns. Your MacBook still closes and sleeps normally; the droplet adds an animation to that familiar movement.

Availability, September 19, 2026: Mac Duo first appeared in 15.2.3-nightly.20260912. The public beta download is still 15.2.2-beta.1, so downloading that beta does not give you this droplet. Check your installed version and the update channel guide before looking for it. The settings below describe the current implementation; nightly builds can differ.

What happens when you move the lid

With Follow the lid on, closing starts a capture of the built-in display. An overlay carries that picture through the animation: its bottom stays pinned while the upper part narrows and recedes toward the display's top edge. The hinge angle drives the movement. If you stop partway, the droplet settles back to the open picture after the lid becomes still, so you can keep working with the laptop at that angle. This is a temporary visual layer over your screen, not a rearrangement of your windows.

The opening is the delicate half

A close begins with the Mac awake and watching: the hand moves, the sensor reports it, and the screenshot is already taken. An open begins with the Mac asleep, and everything it needs arrives late and out of order. The wake notification is one a system wake does not reliably post, the sensor's first reading lands after the hand has stopped, and a capture of the lock screen can take seconds to answer.

So every route back funnels through one reveal path, whichever trigger arrives first, and each capture carries a deadline: 600 milliseconds for the reveal, 700 for the close. A once-a-second heartbeat runs for as long as the panel is up and hands the screen back if the fold stops moving. A missed animation is a disappointment. A screen that stays black until you find Touch ID is a bug.

Which MacBooks can run it

Droppy checks for a working lid-angle sensor before allowing Mac Duo to switch on. Its support message names Apple silicon MacBook Pro, the 2019 16-inch MacBook Pro, and MacBook Air from M2 onward. The sensor check on your machine decides availability; a model name alone is not the check. Reduce Motion also stops the droplet. Turning Follow the lid off does not make an unsupported Mac eligible.

Three tempos, and the preview

Duo is the filmed pace of the full 180 degrees, about 4.33 seconds. Brisk is 2.2 seconds, Quick is 1.3 seconds. The tempo applies when the fold plays on its own curve rather than following your hand: with Follow the lid off, when the display wakes with the lid already open, and when a lid stops mid-fold and the rest finishes from where it stopped. A hand-paced fold ignores the tempo. A timed open that is handing the screen back is capped at 1.4 seconds, because the full filmed tempo there reads as a stuck machine rather than an animation.

Play fold in Settings runs the whole thing without touching anything: the current screen folds shut at the chosen tempo, holds for a moment, and opens again.

Screen Recording, and what happens without it

The picture Mac Duo folds is a screenshot, so it cannot work without Screen Recording. There is no wallpaper fallback and no blank placeholder: if the grant is missing the capture is refused and the fold is cancelled, so the screen is never covered by a panel with nothing to show in it. The Settings page carries the permission row and says plainly when the grant is missing, and the lid path never raises an alert about it, since one triggered by closing a laptop would be worse than a fold that quietly does not run. The grant is explained on the permissions page.

What it costs while it waits

With Follow the lid enabled, the current implementation polls the sensor at 20 Hz while waiting and 120 Hz during a fold. Those are sensor polling rates, not a promise about frame rate or battery use. The animation panel is temporary, and an armed, still fold stops its display link until motion resumes. Turning the droplet off stops its sensor monitoring. There is no battery benchmark behind this guide, so there is no percentage saving to claim.

Setting it up

Open Droppy Settings, find Mac Duo, and switch it on. Grant Screen Recording when it asks. Press Play fold first if you want to see the fold before trusting it with your laptop. Keep Follow the lid on to have it track your hand, or turn it off if you would rather it played once, on its own curve, when the display wakes. The live lid angle readout on the same page is the quickest way to confirm your Mac has the sensor at all.

Limits worth knowing

Mac Duo does not change when your Mac sleeps. The lid still sleeps it the way it always did, and the fold is scenery over that, not a stay-awake tool. If you want a Mac that keeps working with the lid closed, the answer is in what happens when the lid closes. The panel draws on the built-in display, the display the hinge belongs to; it is not a second screen, it does not move windows, and it does not appear on an external monitor.

When the display wakes with the lid already open there is nothing left to follow, so the fold plays on its curve instead of snapping through 180 degrees in one step. The sensor reports whole degrees, so a very slow close arrives in small steps; the fold trails it slightly to smooth those into motion without reading as lag.

Common questions

Does it work on an Intel MacBook?

The Intel model named in Droppy's support message is the 2019 16-inch MacBook Pro. Mac Duo still checks that the machine actually reports a lid angle. If that check fails, it cannot be switched on.

I closed the lid and nothing happened

Check three things in order: Screen Recording, since a missing grant cancels the capture and therefore the fold; the live lid angle on the Settings page, since a Mac without a sensor will never fold; and Reduce Motion, which stops Mac Duo while it is on.

Does the fold keep my Mac awake?

No. Mac Duo does not request that the Mac stay awake with the lid closed. It adds a visual transition and leaves sleep decisions to macOS and your existing setup.

What if I change my mind mid-fold?

Stop the lid and the fold stops with it. Leave it there and the screen finishes opening from the current angle on the filmed curve, capped at 1.4 seconds, so it is never left folded while you are using it.

Sources and version scope