Add to Claude Desktop.

Install the one-click extension in under a minute.

Ultimath ships as a one-click Claude Desktop extension (.mcpb). You'll need the desktop app and your Ultimath API key — grab both first, then follow the steps. The whole thing takes under a minute.

Download Claude Desktop Get your API key
  1. 1

    Download the installer

    On the Get your key page, click Get my free key, then Download one-click installer to save ultimath.mcpb. Keep your key somewhere safe — it's shown only once.

  2. 2

    Open Advanced extension settings

    In Claude Desktop, go to Settings → Extensions → Advanced settings, then click Install Extension.

    Claude Desktop Extension Settings with the Install Extension button
  3. 3

    Pick the ultimath.mcpb file

    Select the file you just downloaded. The Ultimath panel appears, showing its two tools (evaluate and list_functions). Click Install.

    The Ultimath extension panel with an Install button
  4. 4

    Paste your API key

    In the Configure dialog, paste the key from ultimath.ai (it starts with utev_), then click Save.

    Configure dialog with the Ultimath API key field
  5. 5

    Enable it

    Flip the toggle to Enabled, then close the dialog. That's it — Ultimath is live.

    The Ultimath extension toggle switched to Enabled
  6. ✓

    Try it

    Ask Claude a math question. Ultimath runs the expression through four independent engines in parallel and flags any disagreement between them — so the numbers are checked, not guessed.

    Claude using Ultimath to verify Euler's identity across four engines

Prefer another MCP client (Claude Code, Cursor, Gemini CLI) or Linux? Use the manual config shown under Manual setup on the key page. For the official walkthrough, see Anthropic's local-MCP guide ↗.