Sidenote

Name: Sidenote
Author: ElMagoCT

by ElMagoCTversion 1.3.0i★ –iRuns in the cloud

Registry nameio.github.ElMagoCT/sidenote

Install

Overview

Description from the maker (original English)

Read, search and edit your Sidenote notepads, whiteboards and images with your sync key.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
UsageiEarly★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Design, images & audio

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 3 of 3 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://sidenote-sync.netlify.app/mcp

Run this in your terminal

claude mcp add --transport http sidenote https://sidenote-sync.netlify.app/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "sidenote": {
      "url": "https://sidenote-sync.netlify.app/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "sidenote": {
      "type": "http",
      "url": "https://sidenote-sync.netlify.app/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://sidenote-sync.netlify.app/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

The server asks you to sign in before it lists its tools.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account ElMagoCT, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 1321 ms (HTTP 401)
✓ Pass
Sign-in with OAuth
Declares OAuth sign-in, so your AI app can take you to log in
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Design, images & audioi

More stars than 0% of the other 2785 servers in this category
Published to the registry more recently than 100% of the other 2785 servers in this category
Basic checks equal to or better than 100% of the other 2785 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Sidenote safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.3.0) reached the registry today.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Give your coding agent access to your Figma data. Implement designs in any framework in one-shot.

by GLipsWidely used↓ 161.2K/wk★ 16.2KUpdated 5 months ago

Runs on your computer

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Claude Real Video

Let any LLM watch a video locally — and search everything it has ever watched.

by HUANGCHIHHUNGLeoWidely used↓ 1.1K/wk★ 2.3KUpdated 2 months ago

Runs on your computer

Install

Figma MCP Server

Figma’s official server gives AI your design data so it can turn designs into code or describe them accurately. Connects to Figma’s cloud.

by figmaGrowing★ 2.2KUpdated 13 months ago

Runs in the cloud✓ mcp.figma.com

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Sidenote for AI assistants

Let Claude, ChatGPT, Gemini, Codex, Cursor or any other MCP app read and edit your Sidenote notepads, with your Sidenote sync key.

Ask things like *“what's left on my groceries list?”*, *“tick off eggs”*, *“turn this chat into a notepad under Trip plan”* or *“find my notes about the robot arm”*. Changes appear in Sidenote on every synced computer within seconds.

Tool	What it does
`list_notepads`	The notepad tree, with ids and a short preview
`search_notepads`	Full-text search across titles and content
`read_notepad`	One notepad as Markdown (or its stored HTML)
`create_notepad`	A new notepad, or a subpad of one
`update_notepad`	Rename, change accent colour, replace, append or prepend content
`edit_notepad`	Find and replace text, leaving the rest untouched
`organize_notepad`	Star or archive

Nothing is ever deleted through these tools; archiving is the furthest they go.

No account, no setup: sidenote-sync.netlify.app

[sidenote-sync.netlify.app](https://sidenote-sync.netlify.app/) works with any AI, on any plan:

Chat apps (ChatGPT, Claude, Gemini, free plans included): open your notes there with your sync key, tap Link for chat apps, and paste the link into the chat. The chat reads every notepad as plain text. The link is read only and works until you turn links off.
Agents with a terminal (Claude Code, Codex, Gemini CLI, Cursor…): the sidenote CLI is one file with no install. It reads and edits, and notes are decrypted on your computer.

  curl -fsSL https://sidenote-sync.netlify.app/sidenote.mjs -o sidenote.mjs

node sidenote.mjs key sync-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx # once, in your own terminal node sidenote.mjs all # every notepad node sidenote.mjs tick Groceries eggs

Sidenote on the web: sidenote-sync.netlify.app/notes opens your notepads in any browser, on any device, to read and edit, with the same editor as the extension. A pad- or view- key opens just that shared notepad. The key goes in the address after # (which browsers never send to a server), so bookmark the page to come back.
For the AI itself: sidenote-sync.netlify.app/llms.txt explains all of this, plus every CLI command and the Markdown dialect, to any assistant that opens it.

Your sync key

In Sidenote, open the full view → Settings → Sync & devices. Turn sync on if it's off, then press Show next to the sync key (sync-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx). Anyone with this key can read and edit all your notepads, so only paste it where these instructions say.

Two ways to connect

Hosted connector at https://sidenote-sync.netlify.app/mcp, for apps that connect by URL (ChatGPT, claude.ai, the Gemini app). You sign in on Sidenote's own page, so the AI app never sees your key. Notes are decrypted on the connector, in memory, only while a request is answered. Choose Read only at sign-in if the assistant should never change anything.
Local server (this repo's server/index.js), for apps that run tools on your computer (Claude Code, Claude Desktop, Gemini CLI, Codex). Your key stays on your computer and notes are decrypted there; the sync service only ever sees encrypted data. Set SIDENOTE_READ_ONLY=1 for read-only.

Install

Claude Code

claude plugin marketplace add ElMagoCT/sidenote-mcp

claude plugin install sidenote@sidenote

Claude Code asks for your sync key and keeps it in your system keychain. Runs locally.

Claude Desktop

Download sidenote.mcpb from the latest release, open Settings → Extensions, drop the file in, and paste your sync key. Runs locally.

claude.ai (web, desktop and mobile)

Customize → Connectors → Add custom connector, URL https://sidenote-sync.netlify.app/mcp, then Connect and sign in with your sync key.

ChatGPT

At chatgpt.com/plugins, press + → Add custom MCP server, URL https://sidenote-sync.netlify.app/mcp, authentication OAuth, then sign in with your sync key. Which ChatGPT plans can add custom servers is up to OpenAI (help article).

Codex

codex mcp add sidenote --url https://sidenote-sync.netlify.app/mcp

codex mcp login sidenote

Or as a plugin: codex plugin marketplace add ElMagoCT/sidenote-mcp, then /plugins in Codex.

Gemini CLI

gemini extensions install https://github.com/ElMagoCT/sidenote-mcp

It asks for your sync key and keeps it in your system keychain. Runs locally. Antigravity CLI: agy plugin install https://github.com/ElMagoCT/sidenote-mcp.

Gemini app

Settings → Connected apps → Add a custom app, URL https://sidenote-sync.netlify.app/mcp, then sign in. (Google offers custom apps to personal accounts in the US, 18+.)

Cursor, VS Code, Windsurf and other MCP apps

Hosted (the app opens the sign-in page):

{ "mcpServers": { "sidenote": { "url": "https://sidenote-sync.netlify.app/mcp" } } }

Local (needs Node 20+ and git; on npm 12 add --allow-git=root after -y):

"mcpServers": { "sidenote": { "command": "npx", "args": ["-y", "github:ElMagoCT/sidenote-mcp"], "env": { "SIDENOTE_SYNC_KEY": "sync-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx" } } } }

Apps that only take a header can skip sign-in by sending `Authorization: Bearer <your sync key>` to the hosted URL (add `X-Sidenote-Read-Only: 1` for read-only).

Sidenote Markdown

Notepads are read and written as Markdown that maps one-to-one onto Sidenote's editor, so an assistant can change one line without disturbing anything else. Each line is its own paragraph. On top of the usual headings, emphasis, links, lists, - [ ] to-dos, quotes, tables and code blocks:

Markdown	In Sidenote
`==text==`, `text`	highlight, underline
`[Title](sidenote: )`	a link to another notepad
`Title` …	a toggle
`## Heading`	a folded heading

Privacy and security

Sidenote has no accounts. Everything is reached with your sync key, and notepads are stored on the sync service encrypted with AES-256-GCM under keys derived from it.
Local server: your key and your notes stay on your computer. It sends the sync service only what the Sidenote extension itself sends: hashes, write tokens and ciphertext.
Hosted connector: you type your key into Sidenote's sign-in page. It is sealed (AES-256-GCM, under a secret only the connector holds) into the tokens the AI app keeps, so the app never sees it. The connector stores no keys and no notes; it decrypts what a request needs in memory and forgets it. Access tokens last an hour and renew for up to 180 days. Disconnect AI apps signs every app out of an account within an hour.
Links for chat apps: making one sends your key to the connector once, which seals it into the link (the key never appears in it). When a chat opens the link, the connector decrypts your notepads in memory to answer and stores nothing. Anyone with the link can read your notes until you turn links off (that also signs out connected apps). Links are marked noindex.
CLI and Sidenote on the web: both decrypt on your own device, like the local server. The CLI also takes a shared notepad's pad- or view- key.
Whatever an assistant reads is sent to that AI provider (Anthropic, OpenAI, Google…) under its own privacy policy.
Full policy: elmagoct.github.io/sidenote-privacy · Terms · Questions and bugs: issues

How it works

src/keys.js derives the same ids, write tokens and AES keys as the extension. src/client.js reads the encrypted account index and notepads from the sync service and writes back with compare-and-swap, so a write never overwrites an edit it hasn't seen; the extension merges anything typed meanwhile. src/md.js converts between the editor's HTML and Markdown without a DOM. src/tools.js and src/rpc.js are the MCP layer (no SDK, no dependencies), served over stdio by server/index.js and over Streamable HTTP with OAuth 2.1 (client ID metadata documents or dynamic registration, PKCE) by src/remote.js, which runs as a Netlify Edge Function next to the sync service and also serves the chat links. server/cli.js is the CLI (bundled into one file by scripts/build-cli.sh), and web/ is the page at sidenote-sync.netlify.app, which loads src/ straight into the browser.

npm test                    # converter, tools, OAuth, links and CLI against an in-memory sync service

./scripts/build-cli.sh # dist/sidenote.mjs, the one-file CLI the website serves ./scripts/build-mcpb.sh # dist/sidenote.mcpb for Claude Desktop

MIT licensed.

Sidenote

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Design, images & audioi

Common questions

Alternatives

Figma Context MCP

Claude Real Video

Figma MCP Server

README from the maker

Sidenote for AI assistants

No account, no setup: sidenote-sync.netlify.app

Your sync key

Two ways to connect

Install

Claude Code

Claude Desktop

claude.ai (web, desktop and mobile)

ChatGPT

Codex

Gemini CLI

Gemini app

Cursor, VS Code, Windsurf and other MCP apps

Sidenote Markdown

Privacy and security

How it works