Duet Display turns iPads, iPhones, Android tablets, and other devices into second monitors for Mac and Windows computers. Founded by former Apple engineers, the app offers low-latency screen extension over USB or wireless connections. Duet Air adds remote desktop capabilities, while Duet Pro provides Apple Pencil pressure sensitivity and color calibration for creative professionals.
Duet Display pioneered the tablet-as-second-screen category but faces direct competition from Apple's free Sidecar feature (Mac + iPad) and platform-level solutions. Its cross-platform support and professional features maintain relevance for users who need to extend displays across different device ecosystems.
Free, native feature in macOS that turns any iPad into a second Mac display wirelessly. Zero-latency Apple Pencil support. No third-party app required. Limited to Apple ecosystem only.
Hardware dongle providing second display over WiFi with support for using a Mac as a target display. Works with both Mac and iPad as secondary displays. Hardware approach provides more reliable wireless performance.
Free software for extending Windows displays to tablets, phones, and other computers. Simpler feature set but zero cost makes it attractive for casual use. Windows-only primary display support.
Turns Samsung Galaxy devices into desktop computing environments with external display support. Different use case (phone as primary computer) but competes for the portable productivity audience.
Apple's free Sidecar feature eliminated Duet Display's primary use case for Mac + iPad users. Duet must differentiate through cross-platform support, professional features, and use cases that Sidecar does not address.
Remote workers often lack multi-monitor setups at home. Using existing tablets as second screens is a cost-effective solution. Cross-platform support (Windows + Android) serves the largest market segment that Sidecar cannot reach.
Duet Pro's pressure sensitivity, color calibration, and touch controls for creative apps target professionals who need more than basic screen extension. This premium segment is less price-sensitive and harder for free alternatives to serve.
Duet Display's primary competitor is Apple's free Sidecar feature for Mac + iPad users. Other alternatives include Luna Display (hardware dongle), Spacedesk (free Windows solution), and Samsung DeX (Samsung desktop mode).
Sidecar is free and provides excellent performance for Mac + iPad users with minimal setup. Duet Display is better for cross-platform needs (Windows, Android), professional features like color calibration, and remote desktop access. Apple-only users generally do not need Duet Display.
Yes, Duet Display supports both wired USB and wireless connections. Wired provides lower latency and more reliable performance. Duet Air (subscription) enables wireless connections and remote access from anywhere.