MarkerOn is an open-source screen annotation tool designed for use on Windows, macOS, and Linux. It is intended for scenarios such as demos, teaching, meetings, and recordings, allowing users to draw directly over any application window. The tool emphasizes a keyboard-first workflow, enabling quick access to annotation features through shortcuts. For example, users can launch annotation mode with a specific key combination and switch tools or adjust settings without navigating menus. MarkerOn offers eight drawing tools, including pen, highlighter, arrow, shapes, eraser, text, and color selection. Users can draw over their screen and then activate a click-through mode, which keeps annotations visible while allowing normal interaction with the underlying application. A whiteboard mode is also available, providing a blank canvas that can retain content between sessions and supports copying images for use in documents or chats. The platform runs in the system tray and does not require an account, telemetry, or cloud services, focusing on privacy and minimalism. Additional features include angle snapping, custom line widths, undo and redo functionality, and the ability to copy or clear annotations without opening menus. MarkerOn is distributed as a lightweight application, with a download size of approximately 1.5 MB, and is built using Tauri v2. Settings can be adjusted through a dedicated panel, covering aspects such as the toolbar, whiteboard, drag modes, shortcuts, and startup behavior. The tool is particularly suited for live explanations where users need to annotate while keeping the screen active and interactive. Since MarkerOn is open source, it is available for download without a required purchase.
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