Duet is a Mac and iOS utility that turns any iPad, iPhone, or second Mac into a fully interactive additional display — wired over USB or wirelessly — and doubles as a remote desktop client for accessing your machines from anywhere.
What is Duet?
Duet is a display-extension and remote-access app for Mac that transforms your existing devices into extra screens without requiring you to buy dedicated hardware. Plug your iPad in over USB and it becomes a pixel-sharp sidecar with real touch and Apple Pencil input; open the remote desktop mode and you can drive your office Mac from a coffee-shop laptop. It solves two problems most professionals hit every week — not enough screen real estate at the desk, and not enough access away from it.
What does Duet do best?
Duet earns its keep through the quality of its iPad connection. Where some rival tools feel laggy and washed-out, Duet's wired USB mode is genuinely snappy — I use it daily to park Slack and my task manager on a 12.9-inch iPad Pro while my main display handles code and design work. The Apple Pencil integration is a standout: strokes register with pressure sensitivity inside any Mac app that supports a drawing tablet, which makes it genuinely useful for light illustration or PDF markup without buying a dedicated Wacom.
The remote desktop side has matured considerably. I can connect from my MacBook to a headless Mac mini in my home office and get a responsive, full-colour session. It handles retina displays well and supports clipboard sync and file transfer, which are the two things that make remote sessions actually productive rather than merely functional.
How much does Duet cost?
Duet operates on a subscription model. There is a free tier that covers basic local display extension, which is enough to evaluate whether the latency and resolution suit your setup. The paid tiers unlock remote desktop, Air (wireless) mode, and enterprise features like team management. Pricing is available directly on the Duet website; I'd describe it as competitively positioned relative to the cost of a physical second monitor.
Who should use Duet?
If you already own an iPad and you work at a Mac, Duet is the most immediate way to double your usable workspace without spending money on another monitor. Designers who mark up mockups with Apple Pencil, developers who need a persistent terminal or dashboard pane, and anyone who does sustained writing that benefits from a reference document alongside their draft — all of these users get concrete daily value from it.
Remote workers will find the remote desktop layer useful for reaching a more powerful machine at the office. It is not a replacement for a dedicated VPN-plus-Screen-Sharing setup in a corporate environment, but for solo freelancers or small teams it covers the ground well.
- Designers and illustrators who use Apple Pencil for annotation
- Developers who want a dedicated dashboard or log-stream pane
- Writers needing a reference-plus-draft split without a second physical monitor
- Remote workers who need reliable access to a home or office Mac
What are the best Duet alternatives?
Apple's own Sidecar is the obvious comparison: it is free, tightly integrated, and excellent for basic display extension — but it works only with Apple devices on the same Apple ID, has no remote desktop feature, and offers no support for Windows hosts. If you live entirely in Apple silicon and only need the second screen locally, Sidecar is a serious contender.
Luna Display (hardware dongle) is another Mac-to-iPad option that some users prefer for its zero-configuration approach, though it requires purchasing the dongle upfront. For pure remote desktop work, options like Microsoft Remote Desktop (free, excellent for Windows hosts) and Screens 5 (polished VNC client for Mac and iOS) are worth a look. Duet's differentiator is that it handles both use cases — local extension and remote access — in a single subscription, which matters if you want one tool rather than two.
How does Duet compare to Apple Sidecar?
Sidecar wins on price (free) and system-level integration, but Duet wins on flexibility. Duet works with older iPads that Sidecar excludes, works across different Apple IDs, supports Windows hosts, and adds wireless-to-any-device Air mode plus the remote desktop layer that Sidecar simply does not have. For anyone whose workflow extends beyond a single Apple ecosystem, Duet covers terrain Sidecar cannot reach.
