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VSD Viewer vs VSDX Annotator: catalog facts
VSD Viewer	VSDX Annotator
Freemium Free to try, with a paid Pro version.	Freemium Free download from Nektony and the Mac App Store; the cost of full features is not stated…
macOS, iOS	macOS
Opens a wide range of Visio file and stencil formats Shows hidden layers and shape data	Opens VSD, VDX and VSDX files with formatting intact Adds notes and graphics to existing drawings
Viewer only, not an editor Full features require the paid Pro version	macOS only Annotation tool rather than a full Visio replacement
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.