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Sumbo is a free, open-source Windows utility published by koprodev, currently available in version 1.2.0, the only release listed in the catalog. It falls into the desktop enhancement and window management category, serving users who need to monitor content from one application while working in another. The software live-mirrors any window into a single always-on-top view by using native DWM (Desktop Window Manager) thumbnails, which means it operates without screen capture, code injection, or any performance cost to the mirrored application. Typical use cases include keeping a chat conversation, a video stream, a monitoring dashboard, or a game map visible above a user's primary workspace, allowing passive observation of secondary content without switching windows. The mirrored view can be customized extensively: users can crop it to a specific region, adjust opacity between 10 and 100 percent, forward clicks to the source window, or enable click-through mode so the overlay never interferes with underlying work. Additional features include size presets, nine-point screen anchoring for precise placement, profiles for saving configurations, group switching between multiple mirrored windows, an overlay mode that hides the user interface, tray residency for unobtrusive background operation, and a startup update check to notify users of new releases. The interface is localized in 18 languages, making the tool accessible to a broad international audience. Sumbo is designed for Windows and targets anyone who benefits from persistent, lightweight visual reference to another application, from streamers and gamers to professionals tracking live data while focusing on a primary task.
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