See what your notes know

Notecosm reads the notes you already have — any folder of Markdown or text, an Obsidian vault included — and draws them as a map. Notes that mean similar things sit near each other and are joined, whether or not you ever linked them. Groups appear on their own, each with a name. Nothing leaves your Mac.

Mac App Store How it works

Sixteen seconds with a real vault: the map of every note, a star opened to read, and the same knowledge in three dimensions.

The map: notes as coloured stars grouped by meaning, each group named, with a legend of the groups beside it — Every note is a star. What sits together, means together — and each group carries the name of what it is about.

A note open beside the map: its nearest notes with similarity scores, and the note itself rendered from Markdown — Click a star to read the note and see what it sits near — the notes you never linked but always meant to.

A search running: the map dimmed except the region that answers, and the results ranked beside it — Search by meaning and by the words at once. The map lights up where the answers are.

The same graph in three dimensions: a star field with the group names floating in it — The same map in three dimensions, when a flat one is not enough room.

How it works

It reads what you have. Point it at a folder of .md or .txt files. An Obsidian vault works as it is; your folders become the first names of your groups.
It reads for meaning. Apple's on-device language model turns every note into a position. Notes about the same thing end up in the same place — no tags, no links, no work from you.
Groups name themselves. The folder they share, the words only they use, or Apple Intelligence when it has something better to say. You can rename any of them; your name is the one that stays.
Search that finds both kinds of thing. Ask for "brewing coffee" and find the note that says espresso; paste an exact file name and find that. The notes containing your words come first, then the ones that merely look related.
Ask a question. With Apple Intelligence on, Notecosm answers from the notes that matter and names the ones it used.
Write where you read. A new note lands in the group you are looking at; edit any note in place, with the Markdown on buttons. Notecosm writes only what you write, only in the folder you chose — and if a file changed in your editor meanwhile, it refuses the save rather than overwrite it.

What it does not do

No account, no server, no upload. Reading, grouping, searching and answering all happen on your Mac
It does not want to replace your editor. Keep writing where you write; this is where you see what it adds up to
It does not touch notes you did not edit, and never writes outside the folder you chose
Group names and Ask need Apple Intelligence; without it the map, the search and your notes work exactly the same

English and Turkish. Requires macOS 26 on Apple silicon. One payment, no subscription.

How it works

What it does not do

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