MarkerOn

MarkerOn is a keyboard-first screen annotation tool that lets users draw, highlight, and annotate over any application, with a click-through mode that keeps annotations visible while interacting with underlying apps. It solves the problem of live screen annotation for demos, teaching, meetings, and recordings. The tool targets designers, operations professionals, and both B2B and B2C users, including freelancers and enterprises. It is positioned as an open-source, local-first alternative to cloud-dependent annotation tools, with no account or telemetry, and is delivered as a lightweight desktop app for Windows and macOS.

Key features

• Keyboard-first drawing tools
• Click-through mode
• Whiteboard mode
• Angle snapping
• Custom widths
• Undo/redo
• Number keys and V for tools
• Ctrl+scroll adjusts width
• Q/E cycle colors
• Copy and clear without menus
• Select, pen, highlighter, laser, arrow, shapes, eraser, text, stamp, colors
• Settings panel for toolbar, whiteboard, drag modes, shortcuts, startup
• Local-first, no account or telemetry
• Open source under MIT License