cohestry
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Cohestry for iPhone and Mac

Your thinking,
made explorable.

Turn your notes into a connected second brain you can explore, develop and rediscover.

Explore the BrainNo sign-up. Every connection unlocked.

Cohestry is a note-taking app for iPhone and Mac that finds the connections between your notes and lets you explore them in a 3D Brain. Import Apple Notes on your Mac, keep writing on either device, and see how your ideas relate. Free to download, with unlimited notes.

These are 22 example notes. Scroll, and watch them connect.

01 · Connections

Cohestry finds the connections between your notes.

Every note you write becomes a point on a map. Cohestry reads them all and draws a line wherever two notes share something: a name, a word, a tag. You don't have to link anything yourself.

Found for you

It links notes you never linked.

Two example notes, written years apart. Neither mentions the other, but both talk about seeds and carry the same two tags. Cohestry noticed, connected them, and shows you why.

Found in your notes

My grandmother's tomato garden⟷Balcony ecosystem, year two

Shared tags
garden, seeds
Shared vocabulary
seeds
Wording similarity
4%

Worked out on your device from the notes themselves. No AI is involved in this kind of connection.

Follow the thread

Every connection leads somewhere.

Open a connected note and you'll see what it connects to next. Follow a few and you end up back among ideas you'd forgotten you had.

02 · Suggested connections

Apple Intelligence spots the deeper links.

Some notes answer each other without sharing a single word. On devices with Apple Intelligence, Cohestry suggests these connections privately, on the device, and quotes each note so you can see why. You keep or dismiss each suggestion.

Suggested connection · Apple Intelligence

Your novel keeps stalling for the same reason

Fourteen stalled drafts, a note about how things grow and a morning habit. None of them links to the others, yet together they say what to try next. Cohestry quotes the line from each, highlighted on the notes beside this, so you can judge the suggestion yourself.

Every draft of the novel tried to build the whole book at once, and every one stalled around chapter four. The systems note, written six years later, names the fix without mentioning the novel: start with the smallest version that works. The tending note describes the habit that would carry it. Read together, they suggest restarting from one small scene and returning to it for ten minutes a day.

  • The unfinished novel folderevery draft tried to build the whole book at once
  • Small systems grow into complex onesStart with the smallest version that actually works.
  • Tending, not organizingWhat survives is whatever I keep returning to for ten minutes at a time

An example of what a suggestion looks like, written for these example notes.

03 · The Brain

All your notes, as one map.

In the app, the Brain shows every note you've written as a map you can turn, zoom and search, on Mac and iPhone.

Tap a note

See everything it connects to.

Pick any note and the notes connected to it gather around it, each one named, so you can see its whole context at once.

Tap a line

Every connection explains itself.

Tap a line to see why two notes are connected: the names, words and tags they share. Nothing is guessed.

Follow

Walk from one idea to the next.

Each tap moves you along a connection. Here, a memory about a garden leads, five notes later, to a way of working:

  1. My grandmother's tomato garden
  2. Balcony ecosystem, year two
  3. Resilience is redundancy
  4. Small systems grow into complex ones
  5. The unfinished novel folder
  6. Tending, not organizing

04 · Rediscover

Find the notes you've forgotten.

Turn on What I've forgotten and the notes you haven't opened in the longest light up in gold, so old ideas get a second look.

Old meets new

Old ideas find their way back.

Open an old note and the Brain puts its bridges first: connections that reach parts of your notes its neighbours don't. That's how past thinking finds its way into current work.

  1. Capture
  2. Developing
  3. Developed
  4. Evergreen

Notes grow in stages, from a quick capture to an evergreen note: a finished idea worth returning to.

Explore it yourself

05 · A notes app first

Everything you'd expect. Then more.

Unlimited notes, a quiet editor, folders and search, on iPhone and Mac. Start typing: the first line names the note, the way it does in Apple Notes.

Photos in the text

Pictures sit where you put them.

Add a photo or video to the text, take one with the iPhone's camera, or paste and drop images on the Mac. Files attach alongside, up to 20 MB each.

Link as you type

Type [[ and link a thought.

Titles complete as you type, and so do #tags. Every note lists what links back to it, and a link to a note that doesn't exist yet offers to create it.

Nothing lost

Every version, kept.

Each note keeps its revision history, and restoring an old version saves the current one first. Compare two notes side by side when you want to merge a thought.

06 · In and out

Capture from anywhere.

On iPhone, Cohestry is in the share sheet of every app. Send a page, a photo or a passage, add a thought, and it lands in your inbox as a capture. On the Mac, drop it in or press ⌘N.

Share as PDF

Send a note as a real document.

Any note leaves as a PDF with its pictures in place and its text still text: searchable and selectable, on A4 or US Letter for where you live. Or copy a note link, or share the note itself.

Your library, portable

Bring everything in. Take it all out.

Import Markdown and Cohestry backups on either device, and Apple Notes on the Mac, free. With Pro, back up the whole library as Markdown, with attachments and a manifest.

07 · Find, and come back

Anything, in a keystroke.

Search finds notes by their words, through Spotlight, and by meaning. On the Mac, ⌘K opens any note or command, and focus mode clears everything but the page.

Free, every day

Today's insight.

Home shows one connection a day between two of your notes that you haven't linked, and says what they share. One tap links them.

Today's tending · Pro

Three notes a day, each with a reason.

Continue something current, connect a note to something new, or rediscover an old idea. A few minutes a day keeps an archive alive.

What's free and what's Pro →

08 · iPhone and Mac

At home on iPhone and Mac.

Capture on your phone, think on your Mac. The same notes, the same Brain and the same connections on both, synced through your own iCloud.

Apple Notes, welcome

Bring years of Apple Notes with you.

On your Mac, choose the Apple Notes folders to import. Cohestry copies the text, and attachments if you like, and keeps refreshing while it runs. Your originals stay untouched.

How importing works →

Screens recreated from the app with the example notes.

09 · Agent access

Give your AI your thinking, not just your files.

With Pro, the Agent Bridge on your Mac lets Claude, Codex, Cursor and other MCP-compatible tools search and read the notes you allow, on your Mac.

Your rules

It reads only what you allow.

Agent access starts off. Journals and attachments start excluded, and you decide what's readable, note by note or collection by collection. Credentials are redacted before an agent ever sees them.

Suggest mode

It proposes. You decide.

Every write arrives as a proposal under Proposed changes. Nothing touches a note until you accept it.

How the Agent Bridge works →

10 · Private by design

Your notes stay yours. We never see them.

There's no Cohestry account and no Cohestry server. Your notes live on your iPhone and Mac, and every connection is worked out there, on the device.

Sync

Synced through your own iCloud.

Turn on sync and your notes travel between your devices through your private iCloud database. It belongs to your Apple Account, not to us.

Agent access

One door, and only you open it.

The only other way out is an agent you connect on your Mac, like Claude or Codex, reading the notes you allow. It reads them straight from your Mac, never through us. What it does next is up to that agent's own terms.

Zero knowledge

We couldn't read your notes if we tried.

No analytics, no tracking and no ads in the apps. Not a title, a word or a search is ever sent to us, because there is nowhere for it to go.

Read the privacy policy →
  • Your iCloudIf you turn on sync: your private iCloud database, in your Apple Account.
  • Your agent, on your MacOnly if you turn it on, and only the notes you allow. Straight from your Mac.
  • CohestryNothing. No account, no server, no analytics.

Pricing

Start free. Unlock the connections when you're ready.

Notes, Apple Notes importing and the whole Brain are free. Pro reveals the connections in your own Brain and opens it to your agents: $39.99 a year or $5.99 a month, with 7 days free.

Free

$0

Unlimited notes, forever.

  • Unlimited notes, captures, the editor, attachments, folders and search
  • iCloud sync between iPhone and Mac
  • Apple Notes import on the Mac, plus Markdown and Cohestry backups
  • Your own tags and your own written links
  • The whole 3D Brain: every note, moving and clustering, with the connection count
  • Today's insight: one connection the graph noticed, every day
  • The maturity ladder: capture, developing, developed, evergreen
  • PDF export, ⌘K, focus mode and the share extension

Cohestry Pro Save 44%

$39.99per year

$3.33 a month, billed yearly. Or $5.99 a month.

Try Pro free for 7 days

  • Everything in Free, and:
  • Connections revealed on the map
  • Agent Bridge for Claude, Codex, Cursor and moreMac
  • AI tags, tag review and the tag sweep
  • Today's tending
  • Context packs for your collaboratorsMac
  • Markdown export and full-library backup

7 days free, then $39.99 a year or $5.99 a month. Renews until cancelled; cancel any time in Settings. One unlock for iPhone and Mac. Prefer to pay once? Lifetime is $99.99.

22 notes · 42 connections · one line of thought

Your thinking,
made explorable.