Read. Inspect. Compare.
A quiet native workspace for Markdown, JSON, and text on your Mac.
One place for your documents
OpenPreview brings your files together in tabs. Read Markdown with headings, tables, lists, and code blocks. Switch to source whenever you want a closer look.
Make structure visible
Inspect JSON as source, formatted text, or an expandable tree. Formatting a view does not overwrite the file you opened.
See what changed
Right-click a tab to open a horizontal or vertical split. With different files in the two panes, use the comparison button to see text additions and deletions. The left or top pane is the reference.
Keep control of your edits
Documents open read-only. Press Command-E to edit and Command-S to save. Search the current document with Command-F, or all open files with Control-Command-F.
Local work, optional connections
Parsing, search, and comparison run on your Mac without an account. Remote images are loaded only after you interact and allow them. External links open in your browser or mail app.
Availability
Coming soon to the Mac App Store. A one-time paid download, without subscriptions or in-app purchases. The price will be shown on the store when available.
Mac · macOS 26 or later
Interface · primarily Simplified Chinese
Files · up to 32 MiB; simplified text mode above approximately 1 MB
Comparison is text-based, not semantic analysis or Git merging. For image handling and other limits, see the support page.