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