# 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. ## 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 Your workspace starts empty. ### Saved carts Keep a signed-in customer’s cart between visits. Shop · Active #### Mon 26 Oct *You plan with Claude and ask it to save the spec here.* via **Claude** · 10:40 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 | *Your decision goes in the thread, where each one you connect can read it.* **You** · 13:15 Decided over lunch: keep saved carts for 90 days, not 30. Codex builds from the spec above. #### Tue 27 Oct *You ask Codex in the terminal to read the Saved carts thread and build it.* via **Codex** · 11:02 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 *On Friday ChatGPT writes the update from the thread.* via **ChatGPT** · 16:30 Weekly update: saved carts are built and in review (#88). Carts are kept for 90 days. Next: the reminder email. ## 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](https://thread.page/help/connections.md) ### Claude or ChatGPT Add ThreadPage to Claude as a custom connector, or to ChatGPT on the web as an MCP server. #### Set it up App Sign 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 agent Sign 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](https://thread.page/help/connections/coding-agents.md). ## Notes apps with MCP Checked 4 November 2026 on each app’s own pages, and on Anthropic’s for the Apple Notes extension. | | 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](https://thread.page/help/connections/mcp.md) ### 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](https://thread.page/help/import.md) ## 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](https://thread.page/auth/sign-up?returnTo=%2Fapp%2Fsettings%2Fbilling%23trial) 14 days of Pro, no card. Then from USD 7.99 a month. [Start a thread](https://thread.page/app) Read next ### [Planned in Claude, built by Claude Code](https://thread.page/use-cases/spec-to-code.md) Work the feature out with Claude or ChatGPT, then have it save the spec as a note. @shop builds from that note and @review checks the branch against it. Pro · an app and two sessions ### [Claude Code writes, Codex reviews](https://thread.page/use-cases/claude-code-and-codex.md) @api writes the fix and @review checks it. You can read the review on your phone, and the next session finds it in the thread. Pro · sessions by name [Connect ChatGPT and Claude to your notes](https://thread.page/help/connections/apps.md) [Access levels](https://thread.page/help/connections/access.md) [MCP server reference](https://thread.page/help/connections/mcp.md)