Sensor-driven fold
The app reads the MacBook's lid-angle sensor directly, so the glass follows the speed and direction of the lid. It holds when you stop, reverses when you open the lid, and retraces the same position.
Mac Duo
Mac Duo is a macOS utility that turns a supported MacBook’s live display into a sensor-driven pane of frosted glass as the lid closes or opens. It is intended for MacBook users who want an interactive visual effect with adjustable appearance and motion controls.
Mac Duo turns a MacBook display into a sensor-driven glass effect
Mac Duo is a macOS visual-effect utility for MacBooks. When you close the lid, it turns the live display into a modelled pane of frosted glass that lifts and leans away from the screen. The effect is driven by the MacBook's lid-angle sensor rather than by a fixed animation, so it follows the movement of your hand, pauses when the lid pauses, and reverses as you open it.
The app is designed for people who want an interactive display effect during the simple act of closing and opening a MacBook. It includes a live preview and controls for the glass appearance and motion response, while screen capture and rendering are active only during lid movement. It requires macOS 14.0 Sonoma or later, a supported lid sensor, and Screen Recording permission.
Features
Etched-glass visual effect
The display becomes a rendered pane of frosted glass that lifts from the screen, with a gap that grows toward the top. This keeps the lower edge relatively clear while the upper area becomes milky.
Live controls and preview
A live preview, manual scrubber, Play the fold control, and Reset control let you inspect the effect without closing the MacBook. Frost, Perspective, Edge softness, Corner radius, Responsiveness, and Hinge sensitivity can be adjusted.
Metal rendering
The display is captured and the glass is rendered over it with Metal, so windows and wallpaper move together as one surface rather than as separate layers.
Motion-triggered operation
Capture and rendering stop when the lid settles. At rest, the app keeps only a low-frequency lid-angle read waiting for the next movement, and it runs from the menu bar.
Use cases
Interactive desk setup
Use the live display and sensor-driven movement to add a visible, tactile transition whenever you close or reopen a MacBook at a desk.
Demonstrating the effect
Use the scrubber and Play the fold control to inspect how the glass lifts, leans, and changes opacity without repeatedly closing the physical lid.
Tuning the visual treatment
Adjust frost, perspective, edge softness, corner radius, responsiveness, and hinge sensitivity to match the look and feel of a particular display or presentation setup.
Low-intervention daily use
Leave the utility in the menu bar and let it remain idle between movements; capture and rendering resume only when the lid moves.
Pros and Cons
Pros
- The fold responds directly to lid movement instead of playing only a fixed animation.
- The glass is rendered as a material with frost, perspective, edge softness, and corner-radius controls rather than as a simple blur overlay.
- Capture and rendering stop when the lid settles, and the product states that frames stay in memory and are not written to disk or sent elsewhere.
- A one-time purchase covers use on up to five of the buyer's own Macs, with no account or licence key.
Cons
- It requires macOS 14.0 Sonoma or later and a MacBook model that exposes a lid-angle sensor; desktop Macs cannot use it.
- Screen Recording permission is mandatory because the effect is built from the live display.
- The current app is not notarized by Apple, so first launch requires a one-time approval in System Settings → Privacy & Security.
FAQ
Which Macs are supported?
Mac Duo requires macOS 14.0 Sonoma or later and a MacBook with a lid-angle sensor. Most MacBooks from 2019 onwards have one, on both Intel and Apple silicon, but not every model exposes it. The app checks compatibility on first launch. Desktop Macs are not supported because they have no lid sensor.
How do I install and enable Mac Duo?
Install the app from its disk image, drag it to Applications, then open it once. Because the current build is not notarized by Apple, macOS will block the first launch; approve it under System Settings → Privacy & Security by selecting Open Anyway. On first run, allow Screen Recording and click Enable Mac Duo.
Why does Mac Duo need Screen Recording?
Yes. Screen Recording is required because Mac Duo builds the glass from the live display. Capture runs while the lid is moving, frames remain in memory, and nothing is written to disk or sent elsewhere. The app has no analytics, tracking, or account system; its only network connection is an optional software-update check.
Is Mac Duo a subscription, and how many Macs can I use it on?
Mac Duo is sold as a one-time purchase for £2.99 and can be used on up to five of your own Macs. There is no subscription, account, licence key, activation, or trial countdown.
Can I get a refund?
Yes. If Mac Duo does not do what you expected, email [email protected] for a refund. The product page also says unsupported Macs are refunded after the app checks for the required sensor.
Quick Facts
- Category
- macOS utility / visual effect
- Platform
- macOS 14.0 Sonoma or later
- Compatible hardware
- MacBook with an exposed lid-angle sensor
- Distribution
- Universal binary; 2.4 MB
- Licence
- One-time purchase; up to 5 of the buyer's own Macs
- Price
- £2.99
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