# Dyscalculia.io developer docs

> Documentation for the free, open-source developer tools of Dyscalculia.io (dyscalculia.io): sourced dyscalculia statistics as CSV and JSON (CC BY 4.0), a read-only MCP server for AI assistants, and free number practice games to embed. There is no worldwide pooled prevalence figure, only a range across population studies; the figures are not a diagnosis of any person.

Hosted MCP server: https://mcp.dyscalculia.io/mcp
Source: https://github.com/Dyscalculia-io

## Docs

- [Dyscalculia.io developer docs](https://docs.dyscalculia.io/): Developer documentation for Dyscalculia.io: sourced dyscalculia statistics as CSV and JSON, an MCP server for AI assistants, and free number practice games to embed. Open source.
- [Quickstart](https://docs.dyscalculia.io/quickstart): Add the hosted MCP server to Claude, ChatGPT, Codex or Cursor, ask for dyscalculia prevalence with sources, verify with curl, then use the dataset in code and embed a game.
- [MCP server](https://docs.dyscalculia.io/mcp): A free, read-only MCP server with dyscalculia prevalence figures, references with DOIs, chart data and a description of the screening games. Hosted URL or npx; open source.
- [Connect Claude Code](https://docs.dyscalculia.io/mcp/claude-code): How to add the Dyscalculia.io statistics MCP server to Claude Code: Add the hosted URL with one command. A local install works too.
- [Connect Claude (claude.ai and Desktop)](https://docs.dyscalculia.io/mcp/claude): How to add the Dyscalculia.io statistics MCP server to Claude (claude.ai and Desktop): A remote server is added as a custom connector. It needs the hosted URL; npx does not work here.
- [Connect Claude Desktop (local)](https://docs.dyscalculia.io/mcp/claude-desktop): How to add the Dyscalculia.io statistics MCP server to Claude Desktop (local): To run the server on your own machine with npx, add it to Claude Desktop's config file.
- [Connect ChatGPT](https://docs.dyscalculia.io/mcp/chatgpt): How to add the Dyscalculia.io statistics MCP server to ChatGPT: Only a remote (hosted) server works. ChatGPT cannot start a local npx process.
- [Connect Codex](https://docs.dyscalculia.io/mcp/codex): How to add the Dyscalculia.io statistics MCP server to Codex: The Codex CLI and the IDE extension read the same config.toml. Use --url for hosted, npx for local.
- [Connect Cursor](https://docs.dyscalculia.io/mcp/cursor): How to add the Dyscalculia.io statistics MCP server to Cursor: Add a URL or a command to mcp.json, for one project or for every project.
- [Connect VS Code](https://docs.dyscalculia.io/mcp/vscode): How to add the Dyscalculia.io statistics MCP server to VS Code: The workspace file is .vscode/mcp.json. Its top-level key is servers, not mcpServers.
- [Connect Gemini CLI](https://docs.dyscalculia.io/mcp/gemini-cli): How to add the Dyscalculia.io statistics MCP server to Gemini CLI: Use gemini mcp add or edit settings.json. The key for a remote server is httpUrl.
- [Connect Any other client](https://docs.dyscalculia.io/mcp/other): How to add the Dyscalculia.io statistics MCP server to Any other client: Any MCP client that supports Streamable HTTP works with the hosted URL. Clients that only support stdio use npx.
- [Tool reference](https://docs.dyscalculia.io/mcp/tools): Reference for all 6 tools of the Dyscalculia.io MCP server: parameters, types, example requests and real responses generated from the package.
- [Statistics dataset](https://docs.dyscalculia.io/data): Download sourced dyscalculia statistics as CSV and JSON: prevalence studies with sample size, year and age, comorbidity, persistence, maths anxiety, references and screening-game item sets. CC BY 4.0.
- [Embed the number games](https://docs.dyscalculia.io/embed): Add free number practice games to a school, tutoring or parenting site: script tag, web component or React; options, catalog, chart embeds, platform steps, credit link and privacy.
- [FAQ and troubleshooting](https://docs.dyscalculia.io/faq): Answers about the Dyscalculia.io MCP server, statistics dataset and embeddable number games: accounts, sources, licenses, and fixes when tools do not appear or a connector option is missing.
- [Changelog](https://docs.dyscalculia.io/changelog): Dated changes to the Dyscalculia.io developer packages, the hosted MCP server and these docs.

## Optional

- [Dyscalculia statistics](https://dyscalculia.io/dyscalculia-statistics): the figures as a page, with sources.
- [Methodology](https://dyscalculia.io/methodology): how the numbers and the screening test are built.
- [Full documentation as one file](https://docs.dyscalculia.io/llms-full.txt)