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Systems2025v1

AnnotateOverlay

A transparent, always-on-top screen-annotation overlay for Windows — draw on anything, like Epic Pen or ZoomIt.

Role: Solo Developer
AnnotateOverlay

AnnotateOverlay is a Windows desktop app (C# / .NET 8 / WPF) that puts a transparent, always-on-top canvas over your entire screen so you can draw on top of any application — built for presentations, demos and teaching. It ships pen, highlighter, eraser and a 'fading ink' mode that disappears after a pause, a floating draggable/collapsible toolbar, color and background pickers with a persistent custom palette, adjustable canvas/background opacity via modifier-scroll, undo, and save-to-screenshot — with every preference persisted between sessions.

Highlights

  • Built a frameless, transparent fullscreen overlay that stays above every other app, with adjustable canvas and background opacity via modifier-scroll.
  • Implemented a full ink toolset — pen, highlighter, eraser and auto-fading ink — with per-tool color/width memory and undo.
  • Designed a floating, draggable, collapsible toolbar with color pickers, a persistent custom palette, an edge-snapping quick-access button and keyboard shortcuts.
  • Persisted all preferences (colors, widths, opacity, palette, toolbar position) to JSON, and added save-annotated-screenshot export.

Tech

C#.NET 8WPFWindows
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