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Desktop overlay for tracing and annotating any app

TraceLayer is an open-source desktop app that places a transparent overlay on your screen, letting you trace, sketch, or annotate over any application without modifying the original. It is built for architects, designers, and reviewers who need to redline or comment on software like Revit without building plugins.

7 engagement·1 source·Sat, Jul 11, 2026, 06:17 PM
The app creates a transparent layer that sits on top of any window, similar to tracing paper. Users can draw, write notes, or mark up content while the underlying app remains untouched. The developer started with Revit for quick redlines and review notes, then extended it to other applications. The project is open-source and a demo video is available. No LLM usage is mentioned.

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