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MarkText vs MarkViewer: catalog facts
MarkText	MarkViewer
Free Free and open source under the MIT licence, funded by community sponsorship.	Free Free to download and use.
Windows, macOS, Linux	macOS
Live in-place rendering with no preview pane and no leftover syntax characters CommonMark, GitHub Flavored Markdown and some Pandoc Markdown, plus KaTeX maths	Native universal binary for Intel and Apple Silicon GitHub-flavored Markdown with automatic table of contents
Development is slow, with long gaps between releases Electron, so it is heavy for a text editor	macOS only Not open source
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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