No, not as a professional drawing-display replacement: Retina rendering and basic touch are supported, but Apple Pencil and pressure sensitivity are not currently available.

• Features promises Retina/HiDPI output, native-resolution behavior, portrait/landscape switching, and touch actions such as tap, drag, and two-finger scrolling.
• The same section explicitly says Apple Pencil support is on the roadmap. That means current support should not be interpreted as pressure-sensitive pen input being delivered to macOS.
• The project insights also state that professional color management, extremely low-latency drawing, and high-refresh-rate work should not be assumed equivalent to a native display interface.
• The current pipeline is primarily H.264, and the README does not promise color accuracy, pen latency, or high-refresh-rate behavior.

It is better suited to code, dashboards, reference windows, and ordinary touch interaction than to workflows dependent on pen pressure, color consistency, and drawing responsiveness.

Yes, it fits because it directly addresses your iPhone, different-Apple-ID, and true-extension requirements.

• The Features section says macOS treats the device as a real second monitor: you can drag windows to it and arrange it in System Settings instead of only mirroring.
• The Comparison table lists support for iPhone displays, different Apple IDs, USB, and self-hosting. The project is also described as free, open source, no-account, and no-dongle.
• The official receiver requires iOS 16.4+, while the Mac needs Screen Recording and Accessibility permissions; Accessibility is used for touch input.

USB is the better fit when latency matters: the README says it uses macOS’s built-in usbmuxd and needs no tunnel tools. The supplied README does not promise audio synchronization or professional-monitor behavior.

Yes, this combination is explicitly supported, although actual behavior still depends on the cable, devices, and display workload.

• Features calls USB the lowest-latency option. It uses a Lightning/USB-C cable and macOS’s built-in usbmuxd, avoiding the network, WiFi jitter, and helper tools.
• Retina/HiDPI output matches the device panel pixel-for-pixel. The How it works section says the Mac creates an @2x virtual display from the receiver’s native panel size.
• The pipeline uses hardware VideoToolbox H.264, real-time mode, no B-frames, TCP_NODELAY, frame-drop backpressure, and keyframe recovery. These choices target interactive latency and prevent delay from accumulating under congestion.
• Quick start labels USB as recommended, but first use requires a reliable data cable, an unlocked device, Trust This Computer confirmation, and Screen Recording permission on the Mac.

It fits office work, coding, and auxiliary windows. The README does not promise a fixed FPS, end-to-end latency, or high-refresh-rate mode.

It depends: it satisfies the no-account, no-project-server, and local-direct-connection requirements, but the README flags limitations around WiFi encryption, so shared WiFi cannot be treated as secure by default.

• Features says screen contents never touch anyone’s server; the two apps communicate directly over one TCP connection and do not require registration.
• WiFi discovery uses Bonjour and requires both devices to be on the same network, with the receiver kept in the foreground. This simplifies setup but places discovery and connection inside the local network.
• The project insights explicitly call out current WiFi encryption concerns and recommend trusted local networks together with firewall and network-isolation controls.

A home or controlled office LAN can satisfy the self-hosted, non-cloud requirement. A hotel, guest, or shared WiFi network is a different decision: the supplied README does not provide an end-to-end encryption guarantee for sensitive screen contents.

Yes, it is a suitable base because the main media path and wire protocol are already exposed for extension.

• The How it works section documents the chain from CGVirtualDisplay and ScreenCaptureKit through VideoToolbox H.264, TCP, and AVSampleBufferDisplayLayer, with clear boundaries for receiving and input injection.
• It states that socket framing, discovery, video format, and every control message are specified in PROTOCOL.md, while protocol evolution is covered by COMPATIBILITY.md.
• The project is primarily Swift, and the Quick start requires Xcode 15+, matching your toolchain.

There are constraints: the virtual display uses the private CGVirtualDisplay API, so the project cannot ship through the App Store. Public distribution also involves signing, notarization, and GPL-3.0 obligations. The supplied README does not guarantee how newly added fields behave with older clients.

It depends: the receiver version and wired options match the README, but the sender must meet macOS 14+ requirements, so the two Mac roles matter.

• Features explicitly supports installing OpenDisplay Receiver on a spare Mac, with macOS 12+ required for the receiver. It can connect over WiFi or Thunderbolt/Ethernet at native Retina resolution.
• The installation section distinguishes the Mac sender from the OpenDisplay Receiver. The sender is the component that creates the virtual display and therefore has the stricter system requirement.
• The lowest-latency USB path is described for Lightning/USB-C connections to iPhone or iPad. For Mac-to-Mac use, the README names WiFi or Thunderbolt/Ethernet instead; usbmuxd should not be assumed to cover this case.

Using the old Mac only as a receiver is consistent with the documentation. Using it as a sender is not confirmed for macOS 12. Receiver-side keyboard and mouse input are also not complete.