Openly

Openly

Free viewer for Markdown, Mermaid and JSON files

Developer Tools
Free
October 7, 2026
Openly - Screenshot 1
Openly - Screenshot 2
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Openly - Screenshot 5

About

Free viewer for Markdown, Mermaid and JSON files: folder tree, search, TOC, math, diagrams, collapsible JSON, dark mode.

• Opensmd files from your computer or the web, plusmmd /mermaid diagrams • Open a folder and switch files from the sidebar

• Ctrl+K to search every file in the folder

• Table of contents, light / dark theme

• Code highlighting, math, Mermaid diagrams, task lists, alerts

• Auto refresh while you edit

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