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Nested notes

A note can hold other notes

Every parent is itself a note, with its own words, not a bare folder. The tree underneath is plain files and folders that read fine anywhere else.

Kyoto, seven days
Flights booked. Nothing else booked. This is fine.
IN THIS NOTE
Flights
Day 3, Nara
Deer park
Food list
├── kyoto-seven-days.md
└── kyoto-seven-days/
    ├── flights.md
    ├── day-3-nara.md
    ├── day-3-nara/deer-park.md
    └── food-list.md

Parents are notes

Write in the parent like any other note. Its children show in its margin and under its text.

On disk

A note beside a folder of the same name is its subtree. No hidden index, no special format: open the folder in Finder and it makes sense.

Move the whole branch

Move to… or drag a parent and everything under it comes along. Drag a note onto another to make it a child.

Renames follow

Rename a parent and its folder is renamed with it, so the children stay where they belong.

Try it on your own notes
Free during the alpha · macOS 14 or later · Apple silicon · 10 MB
Download the alpha

More of Margin

Plain files
Markdown notes stored as plain files on your Mac

A space is a folder you choose, and every note is one Markdown file inside it. Margin is a fast view over that folder, nothing more.
Seamless Markdown
Markdown editor for Mac with live inline preview

You type Markdown and it renders as you go. No preview pane, no second copy, no toolbar. The markers step aside when the cursor leaves them.
Effortless separation
Separate work and personal notes with spaces

Each space is its own folder, its own note list, its own search and its own tint. One click and the others stop existing for a while.
Notes that know each other
Wikilinks and backlinks between Markdown notes

Links between notes point at the note, not the filename, so reorganising at eleven at night does not break a single one.
Links that know their state
GitHub pull request and issue cards inside your notes

Paste a link to a pull request or an issue and it shows its state, its checks and where the review stands, right in the note.
Your prompts, your model
AI for your notes: your own API key, Claude Code or a local model

It does nothing on its own: no indexing, no reading as you type. Only what you point it at goes to the model you picked, and only when you ask.