Edit with confidence
Syntax highlighting, line numbers, completion, inline errors, and last-valid-preview recovery keep you moving.
Native for macOS · Private by default
Diagram at the speed of thought.
Write Mermaid in a precise native editor, see every change instantly, and move from source to presentation without leaving your Mac.
NativeSwiftUI + TextKit
LocalBundled Mermaid renderer
OpenMIT licensed
FlexibleSVG · PNG · PDF
A complete Mermaid workspace
More than a preview pane.
Meditor keeps plain-text diagrams simple while adding the native tools that make them easier to create, understand, and reuse.
Inspect the structure
Navigate diagram elements, catch common issues, and safely rename supported identifiers.
Export for anywhere
Save SVG, retina PNG, or PDF, or copy a rich image that lets each destination choose its best format.
Present from source
Build a temporary multi-file deck, present full screen, and highlight nodes while you explain.
Finder Quick Look
See the diagram before opening the app.
Select any .mmd or .mermaid file in Finder and
press Space. Quick Look renders it locally with the same bundled engine.
Local-first architecture
Your diagram stays on your Mac by default.
Editing, rendering, Quick Look, export, clipboard, and presentations use local files and bundled resources. Publishing is an explicit, optional action.
Read the privacy policy01Mermaid sourcePlain-text document
02Local rendererBundled Mermaid
03Native outputsPreview · export · Quick Look
OptionalPublish linkOnly after your action
Built in the open
Read it. Build it. Make it yours.
Meditor is a Swift and SwiftUI project with account-free local builds, automated tests, bilingual documentation, and a notarized GitHub release.
Make the next diagram feel native.
Download the latest notarized build for macOS 26 or newer.
Get Meditor