Yes, Stringspec is free to use.

How do I install Stringspec?

Stringspec is a remote plugin. You do not need to install anything locally. Add the server URL to your AI app's MCP configuration and you are ready to go.

Is Stringspec safe to use?

Yes. Stringspec passed MCP Marketplace's automated security scan with a score of 10/10 (low risk). Every server on MCP Marketplace is security-scanned before it's listed; see the full security report on this page for the findings and permissions.

What AI apps work with Stringspec?

Stringspec uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Stringspec MCP Server

by BigBalli

Developer ToolsLow Risk10.0MCP RegistryRemote

Free

Server data from the Official MCP Registry

Lab measurements of nearly 800 tennis strings: search, compare and get recommendations.

About

Lab measurements of nearly 800 tennis strings: search, compare and get recommendations.

Remote endpoints: streamable-http: https://stringspec.com/mcp

Security Report

10.0

Low Risk10.0Low Risk

Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.

4 tools verified · Open access · No issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Found in Source Code

Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.

HTTP Network Access

Connects to external APIs or services over the internet.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "com-stringspec-mcp": {
      "url": "https://stringspec.com/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

StringSpec for Claude and other MCP clients

Ask an AI assistant about tennis strings and get answers from lab measurements instead of marketing copy: how stiff a string is, how fast it loses tension, how much energy it returns, how much spin it allows, and which strings suit a player's needs and racquet.

This repository holds:

the connection details for the StringSpec remote MCP server at https://stringspec.com/mcp,
a Claude plugin that adds that server plus a string-research skill, which teaches Claude how to read the numbers.

The server is run by StringSpec, a database of nearly 800 tennis strings measured on the same machine under the same protocol, so one string's numbers compare fairly with another's. How the numbers are made: methodology.

What you can ask

"Which polyester strings are the softest, and what do they cost?"
"How fast does Solinco Hyper-G 16 lose tension, and how long will it stay playable?"
"Compare RPM Blast 17 with Luxilon ALU Power 16L."
"I have tennis elbow and a stiff racquet. What should I string, without natural gut?"
"What should I string for more spin on an 18x20 racquet?"

Tools

All tools are read-only (readOnlyHint: true) and need no account.

Tool	What it answers
`search_strings`	Filter by name, brand, material, gauge and price; sort by popularity, softest, stiffest, most spin, best tension hold, most power or cheapest. At most 10 strings per call.
`get_string`	Everything on one string, found by name: every measurement with its percentile in the database, elongation at 40, 51 and 62 lb, an estimated playable life, a tension adjustment, how it ranks for spin, comfort, control, power, tension hold, durability and feel, the closest alternatives, and the retail price.
`compare_strings`	Two or three strings side by side, with the comparison page on stringspec.com.
`recommend_strings`	StringSpec's string finder: a main need and an optional second one, adjusted for the racquet (string pattern, head size, frame stiffness), with a material ruled out if asked. Returns a ranked shortlist with a 0 to 100 fit and the reason each string fits.

Every answer separates measurements from estimates (playable life, tension advice and fit are derived from the measurements) and dates each price.

Setup

Claude (claude.ai, Desktop, mobile)

Settings → Connectors → Add custom connector, then paste https://stringspec.com/mcp. No sign-in is needed.

Claude Code

Install the plugin, which adds the server and the string-research skill:

/plugin marketplace add BigBalli/stringspec-mcp
/plugin install stringspec@stringspec

Or add only the server:

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

Other MCP clients

Any client that supports remote MCP servers over Streamable HTTP can use https://stringspec.com/mcp with no credentials. The server speaks protocol versions 2026-07-28, 2025-11-25, 2025-06-18 and 2025-03-26 and answers with JSON (no SSE, no sessions).

Privacy

The server receives the tool name and its arguments (for example a string name or "comfort"), uses them to answer, and does not store them. It never sees your conversation or your account. Full policy: stringspec.com/privacy.

Support

Email g@bigballi.com, or see stringspec.com/connect.

License

The contents of this repository are released under the MIT License. The data served by the StringSpec MCP server is not part of this repository and is not covered by that license.

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