https://github.com/i7t5/edmund
A native, lightweight macOS markdown editor with Live Preview
https://github.com/i7t5/edmund
coteditor editor edmund latex live-preview mac macos markdown markdown-editor obsidian swift typora
Last synced: 2 days ago
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A native, lightweight macOS markdown editor with Live Preview
- Host: GitHub
- URL: https://github.com/i7t5/edmund
- Owner: I7T5
- License: apache-2.0
- Created: 2026-04-01T18:52:28.000Z (3 months ago)
- Default Branch: main
- Last Pushed: 2026-06-28T22:14:55.000Z (8 days ago)
- Last Synced: 2026-06-28T23:18:31.147Z (8 days ago)
- Topics: coteditor, editor, edmund, latex, live-preview, mac, macos, markdown, markdown-editor, obsidian, swift, typora
- Language: Swift
- Homepage:
- Size: 5.01 MB
- Stars: 46
- Watchers: 0
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# Edmund
Edmund is a minimal, file-based, native Markdown editor for macOS with inline live preview.
https://github.com/user-attachments/assets/5c9097c7-68d2-4423-b0f5-495979775f6d
Whether as a companion alongside your Markdown knowledge base or as a standalone editor,
Edmund blends in with macOS and works seamlessly with your files wherever they are.
Our goal is to be the [CotEditor](https://coteditor.com) of Markdown editors,
i.e. elegant, powerful, configurable, and native inside out.
> ⚠️ Edmund is currently in beta. See the [roadmap](docs/ROADMAP.md) for what's coming next :D
## Differentiators
- Live preview: Typora/Obsidian-style WYSIWYG.
- File-based: Open `.md` files from anywhere. No vaults or dedicated folders required.
- Native: 100% Swift. Based on AppKit and TextKit 2. No Electron. Minimal dependencies.
- Fast: Handles ~1-2MB files with ease. No launch lag.
- Extensible: Opt-in math and Obsidian syntax. Extensions system coming soon!
- Private: Offline by default. Optional blocking of external links and HTML sanitization.
See [my blog post](https://i7t5.com/posts/2026-06-26-edmund/) for more of the motivation and design philosophy.
## Screenshots
## Installation
Get `Edmund.dmg` from the [latest release](https://github.com/I7T5/Edmund/releases/latest), open it, and drag `Edmund.app` to `Applications`:
> [!WARNING]
> If macOS reports that the app is `🚧DAMAGED🚧` when you're trying to open it for the first time, fear not.
> The app is not damaged. It's just not signed properly because I am not a $99/yr-certified Apple Developer.
> Good thing is there's an easy way to bypass the barrier.
>
> To open Edmund (or any other "damaged" app) for the first time, choose *one* of the following:
> - System Settings → Privacy & Security → scroll down → Open Anyway. Or,
> - Run the following line in Terminal: `xattr -dr com.apple.quarantine /Applications/Edmund.app`
> - You might also need to prepend the command with `sudo`.
Edmund checks for updates automatically; you can also browse version history [here](https://github.com/I7T5/Edmund/releases).
## Dependencies
- [swift-markdown](https://github.com/swiftlang/swift-markdown)
- [SwiftMath](https://github.com/mgriebling/SwiftMath)
- [Sparkle](https://github.com/sparkle-project/Sparkle)
## Alternatives
If Edmund's not your thing, some of the following might be:
- Closed source
- Obsidian, cyberWriter, Notion
- Typora, Lettera (beta), LitSquare Ink MD
- Open source
- WYSIWYG: [MarkText](https://marktext.me), [Nodes](https://nodes-web.com), [Scratch](https://github.com/erictli/scratch)
- Split-screen: [MacDown](https://macdown.uranusjr.com), [MiaoYan](https://miaoyan.app)
- [MarkEdit](https://github.com/MarkEdit-app/MarkEdit) - TextEdit for Markdown
- I *love* this. If only I wasn't so dependent on rendered math...
- [editxr](https://github.com/pixdeo/editxr) - TUI
- More feature-rich: [FSNotes](https://fsnot.es), [Zettlr](https://www.zettlr.com), [Joplin](https://joplinapp.org), [Tangent](https://www.tangentnotes.com)
The list is by no means exhaustive, and neither was it meant to be. I just wanted to give credit to the makers of these apps, esp. IMO the aesthetic open sourced ones. A comprehensive list may be found [here](https://github.com/mundimark/awesome-markdown-editors).
## Acknowledgements
The following have greatly influenced the architecture and/or helped with design. I owe them many thanks:
- [Swift Markdown Engine](https://github.com/nodes-app/swift-markdown-engine) / [Nodes](https://nodes-web.com) for the parser/token architecture and the TextKit 2 integration
- [Typora](https://typora.io) and Apple Notes for app menu organization
- [Tomorrow Light](https://github.com/chriskempson/tomorrow-theme) and [One Dark](https://github.com/atom/atom/tree/master/packages/one-dark-syntax) for code syntax highlighting
- [create-dmg](https://github.com/sindresorhus/create-dmg) for a Apple-looking `.dmg`
- [MarkEdit](https://github.com/MarkEdit-app/MarkEdit) for the readme organization
- [screenshot-studio](screenshot-studio.com) for the amazing screenshots editing experience
- [shields](shields.io) for the beautiful badges in this readme
- Claude, [caveman](https://github.com/JuliusBrussee/caveman), and [ponytail](https://github.com/DietrichGebert/ponytail) for the engineering.
## License
[Apache License 2.0](LICENSE)