LetX

Name: LetX
Author: Shahriar-Labs

by Shahriar-Labsversion 1.1.1i★ –iRuns in the cloud

Registry nameapp.letx/letx

Install

Overview

Description from the maker (original English)

Collaborative LaTeX editor: search 1000+ templates, edit projects, and compile them to PDF.

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 checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

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: Docs, sheets & office work

Install

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

Before you install

Basic checks: 1 of 1 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://api.letx.app/mcp

Run this in your terminal

claude mcp add --transport http letx https://api.letx.app/mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "letx": {
      "url": "https://api.letx.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": {
    "letx": {
      "type": "http",
      "url": "https://api.letx.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://api.letx.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

We have not read this server’s tool list yet; we check endpoints in rotation.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain letx.app (the registry checks domain ownership)
… 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
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… 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 Docs, sheets & office worki

More stars than 0% of the other 2169 servers in this category
Published to the registry more recently than 76% of the other 2169 servers in this category
Basic checks equal to or better than 100% of the other 2169 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 LetX safe?

It passed 1 of 1 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 (1.1.1) reached the registry 9 days ago.

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: Agent-Native Calendar, Excel MCP Server, MCP Server for Excel

Alternatives

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

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

Agent-Native Calendar

by BuilderIO

Agent-Native Google Calendar - manage events, sync, and public booking

Runs in the cloud★ 7,620MITUpdated 2 months ago

Install

Excel MCP Server

by haris-musa

Lets AI create and edit Excel files itself, including formulas, charts and PivotTables, without Excel installed.

Runs on your computer★ 4,276MITUpdated 5 days ago

Install

MCP Server for Excel

by sbroenne

Excel automation for AI - Sheets, Power Query, DAX, VBA, Tables, Ranges and more. Windows only.

Runs on your computer★ 847MITUpdated 3 days ago

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.

letX

letX is a collaborative LaTeX editor. This plugin connects your AI assistant to your letX account, so you can work on LaTeX documents from the conversation: find a template, start a project, read and edit its files, and compile it to PDF, with the LaTeX errors reported by file and line so they can be fixed.

What it includes

The letX MCP server at https://api.letx.app/mcp. You sign in with your letX account (OAuth 2.1) and approve what the assistant may do: read letX's templates, read and edit your projects, and compile them. You can disconnect it at any time in letX under Settings, Connected apps.
Two skills:
compile-and-fix: compile LaTeX from the conversation or a letX project, and fix the errors it reports until the document builds.
start-from-template: find a template in letX's library and start a project from it.

Connect from other MCP clients

The server is also in the MCP Registry as app.letx/letx. Any client can reach it at https://api.letx.app/mcp (streamable HTTP). The first connection opens letX in your browser to sign in and approve access.

Claude Code: claude mcp add --transport http letx https://api.letx.app/mcp
Codex CLI: codex mcp add letx --url https://api.letx.app/mcp, then approve in the browser tab it opens. If Codex later says it is not signed in, run codex mcp login letx.
Other clients that support remote MCP servers with OAuth: add https://api.letx.app/mcp as a remote server in their MCP settings.

Tools

Tool	What it does	Changes anything?
`search_templates`	Search letX's LaTeX template library	No
`get_template`	Details of one template: description, author, license, page link	No
`search`, `fetch`	The same template search and details, in the shape deep research expects	No
`list_projects`	Your letX projects, with their ids	No
`list_project_files`	The documents and uploaded files in one project	No
`read_project_file`	The text of one document in a project	No
`create_project`	A new project from LaTeX files	Creates a project
`create_project_from_template`	A new project from a template	Creates a project
`update_project_file`	Create or replace one document; the previous version stays in the project's history	Replaces a file
`compile_latex`	Compile LaTeX from the conversation in your "AI Scratchpad" project	Replaces that project's files of the same name
`compile_project`	Compile one of your projects	Starts a build
`set_project_compiler`	Set a project's TeX engine: pdflatex, xelatex or lualatex	Changes one setting

What it sends and receives

The plugin runs no code on your machine and connects to nothing but the letX MCP server above. When the assistant calls a tool, letX receives that call's arguments (for example the file it writes or the project it compiles) and returns the result: project names and ids, file lists, the text of the files it reads, template details, compile results with the errors from the log, and a link that opens the PDF for an hour. letX does not receive your conversation. The details are in the privacy policy.

Requirements

A letX account. Using letX from an AI app is part of letX's paid plans, and in Claude a free account can try it for 7 days from its first connection. Plans are described at https://letx.app/pricing/.

Support

https://letx.app/help/ or support@letx.app. Documentation and example prompts: https://letx.app/mcp/

License

MIT. See LICENSE.

LetX

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 Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

letX

What it includes

Connect from other MCP clients

Tools

What it sends and receives

Requirements

Support

License