An open-source testing and evaluation platform for MCP servers, MCP apps and ChatGPT apps.
Sources and review #
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
Server authors checking that their MCP server behaves the same in ChatGPT, Claude and Cursor.
About MCPJam Inspector #
MCPJam lets MCP server developers test tools, prompts, resources and authorisation interactively across 16 client configurations and more than 170 models, with traces of every JSON-RPC message and OAuth exchange. It runs evals on test cases to catch cross-client differences and gate regressions in CI. It runs locally or as a hosted app; most code is Apache-2.0, while its evaluation services carry a separate licence.
MCPJam Inspector is an open-source project written primarily in TypeScript, with 2.2k stars on GitHub. It was last updated in September 2026.
npx @mcpjam/inspector@latest
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MCPJam Inspector vs. the alternatives #
| Record | Stars | Pricing | ||
|---|---|---|---|---|
| MCPJam Inspectorthis listing | 2.2k | TypeScript | — | Open source |
| MCP Reference Servers | 91k | TypeScript | MIT AND Apache-2.0 | Open source |
| context7 | 62k | TypeScript | MIT | Open source |
| chrome-devtools-mcp | 53k | TypeScript | Apache-2.0 | Open source |
| Playwright MCP | 37k | TypeScript | Apache-2.0 | Open source |
| github-mcp-server | 33k | Go | MIT | Open source |