What is Calculator Tools MCP?

MCP means Model Context Protocol. It is how Cursor, Claude, and ChatGPT attach extra tools. Calculator Tools MCP is those tools pointed at our app host. The assistant can create an app, write index.html, update files, list your apps, and return a live link.

This is the same product people already use on calculator.tools: instant one-page web apps, hosted for you, shareable with anyone. MCP does not replace the Create page. It is the same publish step, started from an assistant you already use. If you prefer ChatGPT custom GPTs, those still live on the ChatGPT page.

What you can publish

Ask for a mortgage calculator, a habit tracker, a tip splitter, a quiz, a countdown, a unit converter, or a tiny game. The assistant writes HTML, CSS, and JavaScript. Calculator Tools hosts a public page under /app/. You can open it on your phone and send the link to a friend.

You can also start from a picture or a screenshot on Image to App and Screenshot to App if you are building in the browser instead of in Cursor.

https://api.calculator.tools/mcp/

{
  "mcpServers": {
    "calculator-tools": {
      "url": "https://api.calculator.tools/mcp/",
      "headers": {
        "Authorization": "Bearer YOUR_MCP_CODE"
      }
    }
  }
}

How to connect in Cursor

Open Cursor Settings, then MCP. Add a new server. Paste https://api.calculator.tools/mcp/ as the server URL. Save. Cursor will open Calculator Tools so you can sign in and Approve. After that, ask the agent to create a hosted app and give you the live URL.

If your Cursor build asks for a command instead of a URL, use the dashboard MCP code in the Authorization header as shown above.

How to connect in Claude

In Claude, add a custom connector and paste the same MCP URL. Claude should send you to the Calculator Tools login page. Approve access. Then ask Claude to publish a calculator or tool and to return the public link.

Listed connectors in the Claude directory use this same OAuth login. Until the listing is live, the custom connector URL still works.

How to connect in ChatGPT

ChatGPT can use MCP plugins the same way: add https://api.calculator.tools/mcp/, sign in, Approve. You can also keep using Calculator Tools custom GPTs if you already work inside ChatGPT. Both paths save apps to the same account.

What the assistant can do

After you Approve, the assistant can call Calculator Tools tools on your account only:

• Create an app with a title and description, then get a public URL.
• List your apps and see whether you still have free quota or need Pro.
• Read and update files such as index.html, styles.css, and app.js.
• Set a logo from a public image URL.
• Delete an app or a file you own. That cannot be undone.

The assistant cannot charge your card. If you are over the free app limit, it receives a checkout URL. You open that link and pay if you want more apps. Upgrade to Pro when you need a higher limit and stronger models on the website.

You own the live URL

Every published app is a normal Calculator Tools page. It is not trapped inside the chat. Open it from your dashboard, share it, or remix it later on the site. Search visitors already use hosted tools at /app/ URLs. MCP is how an assistant can add another real page to that same host.

MCP FAQ