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Lemmafour for AI assistants and developers

Ask your assistant for a worksheet, report, paper or resume, and Lemmafour typesets it into a print-quality PDF with real math, tables, code and images. It checks accessibility (PDF/UA-1) and explains each issue with the line and the fix. No account is needed for the free templates.

The MCP server

One address for every assistant and agent that supports remote MCP servers:

https://mcp.lemmafour.com/mcp

It offers three tools:

Connect your assistant

Claude (web, desktop and mobile)

In Claude, open Customize → Connectors, choose Add custom connector, and paste the address above. Connectors you add on the web or desktop also appear in the mobile apps.

ChatGPT

Open ChatGPT Plugins, select +, name it Lemmafour, and enter the address above under Connection. This uses ChatGPT's developer mode, whose availability depends on your account and workspace.

Claude Code

claude mcp add --transport http lemmafour https://mcp.lemmafour.com/mcp

Codex

# ~/.codex/config.toml
[mcp_servers.lemmafour]
url = "https://mcp.lemmafour.com/mcp"

To use a Lemmafour plan, sign in with codex mcp login lemmafour.

Cursor

// ~/.cursor/mcp.json
{
  "mcpServers": {
    "lemmafour": { "url": "https://mcp.lemmafour.com/mcp" }
  }
}

VS Code

// .vscode/mcp.json
{
  "servers": {
    "lemmafour": { "type": "http", "url": "https://mcp.lemmafour.com/mcp" }
  }
}

Other clients: add a remote MCP server (Streamable HTTP) with the address above. Sign-in uses OAuth with PKCE; clients that support MCP sign-in handle it for you.

Example prompts

Ask in your own words; these work as written, without an account.

  1. "Make a fractions worksheet for grade 5 with 10 multiple-choice questions and an answer key at the end, as a PDF." You get a worksheet with numbered questions, options laid out in columns, and the answers on a final page. The chat shows a preview with Download and Customize.
  2. "Turn these notes into a two-column paper with numbered equations." A two-column PDF with LaTeX math and equation numbers. Customize changes columns, margins, paper size and theme, and the preview updates.
  3. "Write my one-page resume from this text and make it a PDF." A resume in the resume template, tagged for screen readers.
  4. "Write a lab report on my pendulum experiment with a results table. I'll add the photo of the setup." A report with the table typeset. The photo is not sent through the chat: the preview lists it, and Add images in Lemmafour opens the document in the editor, where you add the photo from your device.
  5. "Is this report accessible? Check it against PDF/UA." A pass or fail against PDF/UA-1, the accessible-PDF standard, listing each problem (missing alt text, title or language) with its line and the fix.

Free features and plans

HTTP API

To try Lemmafour from a script, the same engine is available over HTTP at https://mcp.lemmafour.com/v1, described by an OpenAPI document. Without a token it uses the free templates and is meant for trying it out and light use. For regular automated use, contact us. 

curl -sS https://mcp.lemmafour.com/v1/render \
  -H 'content-type: application/json' \
  -d '{"markdown": "---\ntitle: Circles\nlanguage: en\n---\n\n# Circles\n\nThe area is $\\pi r^2$."}' \
  -o circles.pdf

Limits

Privacy

Documents sent by an assistant or the API are processed in memory to make the PDF and are never stored, used to train AI models, or shared. Our logs contain metadata only, never document content. The privacy policy has the details, and the terms cover the service. The website's own tools still process your files on your device.

Support

Questions or problems: support@lemmafour.com.