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Windows Companion, published by Hai Robo, is a system-tray application for Windows PCs designed to pair with the Hai Robo mobile app, available for both iPhone and Android devices, over a local Wi-Fi network. Its purpose is to let the phone app answer questions about what is currently happening on the computer's screen, effectively linking the mobile device with the desktop environment. The software falls into the category of PC-to-mobile companion utilities, sitting at the intersection of screen sharing, device pairing, and accessibility tooling. The current release is version 1.3.0, and the catalog lists two versions of the software overall, indicating an earlier release preceded the present build. In operation, Windows Companion runs quietly from the Windows system tray and exposes an authenticated local HTTP server that the paired phone app calls to request three core capabilities: screen capture, identification of the foreground application, and text-to-speech output. These endpoints supply the Hai Robo phone app with the screen context it needs to respond to user questions about the desktop, while the authentication requirement ensures that requests are accepted only from a paired device. Because the connection works entirely over local Wi-Fi, the screen data and requests remain on the user's own network rather than passing through an external service. Setup is intentionally straightforward. Pairing between the phone and the PC is completed once by scanning a QR code, after which the connection is established without further configuration. To make the PC easy to find on the network, Windows Companion advertises itself using mDNS, so the Hai Robo phone app can discover it automatically with no hard-coded IP address required. Typical use cases include asking the phone app to interpret or describe on-screen content, checking which application is currently in focus on the PC, and having desktop text spoken aloud through the phone, making the software useful for both convenience and accessibility-oriented workflows.
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