MarkerOn

Lightweight open-source screen annotation tool with click-through mode for demos and teaching.

Desktopfree

A lightweight open-source desktop app for macOS that adds simple on-screen drawing and annotations during presentations, demos, and teaching. Called MarkerOn, it offers a click-through mode so annotations can be made without blocking interaction, and is aimed at instructors, presenters, and anyone who needs quick visual notes during demonstrations.

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Behind the summary, Matchbox keeps a richer profile of MarkerOn - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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