A notes app with MCP for Claude, ChatGPT and Codex

ThreadPage is a notes app with an MCP server. Claude, ChatGPT, Codex and Claude Code sign in to it, read the threads you allow and add notes of their own, so the spec Claude saved in the morning is there when you ask Codex to build it.

Start free trial

14 days of Pro, no card. Then from USD 7.99 a month.

See the thread

At a glance

Works with: Claude on the web, desktop and phone, ChatGPT on the web, Codex and Claude Code.
Server: thread.page/mcp, hosted by ThreadPage. You sign in from the assistant, and there’s nothing to host.
It can: On Read and add, search and read your threads, add notes and threads, and change the notes it added. Read only allows less; Edit and organize, more.
You choose: All threads, or only the folders and threads you select.
Plan: Pro From USD 7.99 a month, 14 days free with no card. With a free account they can add notes to your Inbox, but not read them.

Before

You plan a feature with Claude in the morning. In the afternoon Codex builds it without having seen the plan, so you paste the plan in, and the decision you made over lunch is in neither chat. On Friday ChatGPT writes the weekly update from whatever you remember to tell it.

Why a thread, not the assistant’s memory

All four read the same notes
Claude’s memory stays in Claude, ChatGPT’s in ChatGPT, and a CLAUDE.md or AGENTS.md in one repository. A thread is one place that Claude, ChatGPT, Codex and Claude Code all read and write.
A colleague can read it too
With Pro, share the thread, and someone without Claude or ChatGPT reads the spec, your decisions and each assistant’s notes in their browser.
Each note says who wrote it
A note an assistant adds says Added via and the connection’s name, and sits between your own notes in date order.
Each one sees what you give it
ChatGPT on Read only in one folder; Codex on every thread except your Personal folder.

A thread, over time Example

Your workspace starts empty.

Shop

Saved carts

Keep a signed-in customer’s cart between visits.

Active

Mon 26 Oct
1. You plan with Claude and ask it to save the spec here.
  via Claude10:40
  Spec for saved carts, from this morning’s conversation.
  Criterion Detail
  Kept for 30 days after the last change
  On sign-in Merged with the cart in the browser
  Out of stock Kept, marked, not counted in the total
2. Your decision goes in the thread, where each one you connect can read it.
  You13:15
  Decided over lunch: keep saved carts for 90 days, not 30. Codex builds from the spec above.
Tue 27 Oct
1. You ask Codex in the terminal to read the Saved carts thread and build it.
  via Codex11:02
  Built on the saved-carts branch: saving, merging at sign-in and out-of-stock items. Carts are kept 90 days, as decided. Not done: the reminder email. Pull request #88.
Fri 30 Oct
1. On Friday ChatGPT writes the update from the thread.
  via ChatGPT16:30
  Weekly update: saved carts are built and in review (#88). Carts are kept for 90 days. Next: the reminder email.

Criterion	Detail
Kept for	30 days after the last change
On sign-in	Merged with the cart in the browser
Out of stock	Kept, marked, not counted in the total

What each access level allows

You choose a level when you connect, and change it any time in Settings → Connections.

Edit and organize. Read, add and edit notes, and organize threads and folders, including Archive and Trash. Can’t delete permanently.
Read and add, where Claude, ChatGPT, Codex and Claude Code start. Read and search notes. Add notes, threads and reminders, and change or move to Trash the notes it added.
Read only. Read and search notes, including earlier versions. No changes.
Add only. Add notes to the threads you choose and see their titles. Can’t read notes.
Add to Inbox, with a free account. Add notes to your Inbox, up to 3,000 a month. Can’t read notes.

What no connection can do

Delete anything permanently or empty Trash.
Share a thread or folder, or change who has access.
Send a note with @, or answer a question for you.
Read your drafts, or export or import your notes.
Change its own access, your account or your plan.

Its Recent activity shows what it read and changed. Undo changes… takes back what it changed, where nothing has changed it since, and Restore from Trash… brings back what it moved there.

Connect Claude, ChatGPT, Codex or Claude Code.

Each one reads and writes only where its access allows.

Connect an assistant

Claude or ChatGPT
Add ThreadPage to Claude as a custom connector, or to ChatGPT on the web as an MCP server.
Set it up
AppSign in to ThreadPage
1. In ThreadPage, open Settings → Connections → Apps. For Claude, choose Add to Claude: its custom connector form opens with ThreadPage filled in. Claude Free allows one custom connector.
2. For ChatGPT, choose Copy server URL, then Open ChatGPT. In Plugins, choose + → Add custom MCP server and paste https://thread.page/mcp, then choose Create as a plugin and install it.
3. Sign in to ThreadPage when it asks, choose the level and the folders and threads, then Connect.
Codex or Claude Code
Run one command in your terminal, then sign in to ThreadPage in the browser that opens.
Set it up
Coding agentSign in to ThreadPage
1. Codex: run codex mcp add threadpage --url https://thread.page/mcp
2. Claude Code: run claude mcp add --transport http --scope user threadpage https://thread.page/mcp; claude mcp login threadpage
3. To write to a session by name from any thread, connect it as a session instead: Coding agents.

Notes apps with MCP

Checked 4 November 2026 on each app’s own pages, and on Anthropic’s for the Apple Notes extension.

Notes apps with MCP
	MCP server	What it reaches	Plan
ThreadPage	Hosted; sign-in for Claude, ChatGPT, Codex, Claude Code	All or chosen threads; 5 access levels	Pro; with a free account, Inbox only
Notion	Hosted, with sign-in	Whole workspace, your full permissions	Every plan
Evernote	Hosted, in beta	Your account; reads and creates notes	Paid plans, from USD 14.99 a month
Bear	Local, on a Mac	Tags you choose; never reads encrypted notes	Not stated
Craft	One address per connection	One space: daily notes or documents	Not stated
Capacities	Hosted	One space per connection	Pro, USD 11.99 a month
Mem	Hosted, with sign-in	Notes and collections, Trash too	Not stated
Heptabase	Hosted, plus plugins	Your space: cards, journals, whiteboards	Pro and up, or a trial
Tana	Local, or hosted in beta	Your workspace	Local free; hosted on paid plans
Hjarni	Hosted, with sign-in	Your account, or folders by agent token	Free to 25 notes; Pro USD 12 a month
Obsidian	None official; a CLI while the app runs	Your vault	Free app
Apple Notes	None from Apple; Anthropic’s extension	Notes on a Mac, from Claude Desktop	Free extension

Questions

What does an MCP server do for a notes app?
MCP, the Model Context Protocol, is how an assistant reaches tools outside its chat. ThreadPage’s server, at thread.page/mcp, lets Claude, ChatGPT, Codex and Claude Code search your threads, read notes and add new ones, within the access you chose when you connected.
Do I need to install or run an MCP server?
No. ThreadPage hosts it. You add its address to Claude or ChatGPT, or run one command for Codex or Claude Code, and sign in to ThreadPage in your browser. What the server can do
Can someone else’s note tell my assistant what to do?
Notes from other people and services reach it marked as information, not instructions, and only you can send it a request. It can still be misled, so check what it changed in its Recent activity.
Is this the same as Claude’s or ChatGPT’s memory?
No. Memory is what one assistant keeps about you, inside that assistant. A thread is notes you write and read yourself, and each assistant you connect reads the same ones. You can keep using both.
Can Claude and ChatGPT read the same notes?
Yes. Connect both, and each reads the threads its access allows. Each note it adds says which connection added it.
Can an assistant delete my notes?
Not permanently. On Read and add it can move only the notes it added to Trash; on Edit and organize, any note. Restore from Trash… in its Recent activity brings them back.
Does ThreadPage use my notes to train AI models?
No. ThreadPage has no AI of its own and does not use your notes to train AI models. What an assistant reads goes to its provider, under that provider’s rules.
My notes are in Apple Notes, Notion or Obsidian. Can an assistant read them?
Notion has its own MCP server, which works with your full workspace permissions. On a Mac, Claude Desktop reads and writes Apple Notes through Anthropic’s extension. Obsidian has no official MCP server. To give all four the same notes, each limited to a folder or a thread, import them: ThreadPage reads exports from 15 apps in your browser. Import from other apps

Limits

ThreadPage doesn’t run an AI model. Claude, ChatGPT, Codex and Claude Code run on your plans with them, and AI provider fees are paid separately.
Sign-in works for Claude, ChatGPT, Codex and Claude Code, and ChatGPT connects on the web only. Another app connects with a token from Settings → Connections → Automations → Script or API, on every level but Edit and organize.
They read only notes synced to your account, which needs Pro. Notes kept only in a browser stay out of reach.
Notes are stored on ThreadPage’s servers in Europe, encrypted in transit and at rest but not end to end, so keep secrets out of them.

Claude, Claude Desktop, ChatGPT, Codex, Claude Code, Notion, Evernote, Bear, Capacities, Mem, Heptabase, Hjarni, Obsidian, Apple Notes, and Anthropic are the names of their owners. ThreadPage is independent and not affiliated with or endorsed by them.

Start with one thread.

Start free trial

14 days of Pro, no card. Then from USD 7.99 a month.

Start a thread

A notes app with MCP for Claude, ChatGPT and Codex

At a glance

Before

Why a thread, not the assistant’s memory

All four read the same notes

A colleague can read it too

Each note says who wrote it

Each one sees what you give it

A thread, over time Example

Saved carts

Mon 26 Oct

Tue 27 Oct

Fri 30 Oct

What each access level allows

What no connection can do

Connect Claude, ChatGPT, Codex or Claude Code.

Claude or ChatGPT

Codex or Claude Code

Notes apps with MCP

Questions

What does an MCP server do for a notes app?

Do I need to install or run an MCP server?

Can someone else’s note tell my assistant what to do?

Is this the same as Claude’s or ChatGPT’s memory?

Can Claude and ChatGPT read the same notes?

Can an assistant delete my notes?

Does ThreadPage use my notes to train AI models?

My notes are in Apple Notes, Notion or Obsidian. Can an assistant read them?

Limits

Start with one thread.

Planned in Claude, built by Claude Code

Claude Code writes, Codex reviews