6 tested alternatives to Marble. Each was assigned the same job label from a fixed vocabulary we maintain — not from how the vendor describes itself — and every one is scored on the same objective 7-Frame benchmark. Ordered by score.
Same job does not mean same platform, same country, or same price tier. Check before you switch.
icanwrite — A browser-based Markdown editor for writers with AI-assisted manuscript review
MD+HTML Reader — A read-only Markdown and HTML reader for macOS built for reviewing AI-generated docs
wander — Wander is a local-first WYSIWYG Markdown editor for Mac and iPhone
Markdown Buddy — Native Markdown editor and previewer for macOS, available for a one-off €0.99 purchase
Markdown Viewer — Free online Markdown editor with live preview, math, and diagram support
OpenMarkdown — OpenMarkdown is a local-first Markdown editor built for working alongside AI agents