MCPJam Inspector
UnclaimedTest and develop ChatGPT and MCP apps locally without ngrok or ChatGPT subscription.
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TL;DR - MCPJam Inspector
- Locally test and develop ChatGPT and MCP apps.
- Emulates ChatGPT behavior, exposing API calls and JSON-RPC traffic.
- Includes OAuth debugger and LLM playground for testing with various models.
Pricing: Free plan available
Best for: Growing teams
Pros & Cons
Pros
- Useful for MCP protocol inspection
- Developer tool
- Open source
- Good for debugging
Cons
- Very niche use case
- Requires MCP knowledge
- Small user base
Key Features
MCP debuggingProtocol inspectionMessage loggingConnection testingError diagnosisDeveloper tools
Pricing Plans
Community
Free
- Test server primitives like tools, resources, prompts
- LLM playground for testing in real environments
- Playground free models or bring your own key
- Evals / pen test limited to 1 test case
- OAuth testing with dynamic client registration
- Collaboration features like share tools
- Up to 3 users per team
- Launch Inspector: npx@mcpjam/inspector@latest
Enterprise
Contact us
- Everything in Community, plus:
- Unlimited evals / pen test runs
- Integrate tests into your CI/CD
- Security and evals agent
- Server quality analysis agent
- Unlimited playground use with any model
- Advanced collaboration features
- No seat limits
- Customer success 24/7 support
About MCPJam Inspector
By Toolradar Team·
MCPJam Inspector is a local development tool designed for building and testing ChatGPT Apps SDK and MCP (ext-apps) applications. It provides an emulator that simulates ChatGPT's behavior, exposing all `windows.openai` API calls and JSON-RPC traffic, similar to Chrome DevTools for web applications. This allows developers to rapidly iterate on their apps without needing an ngrok tunnel or a ChatGPT subscription.
The tool also includes an OAuth debugger to visualize and verify MCP authorization flows against the MCP specification. Additionally, its LLM playground offers 1:1 emulation with ChatGPT, enabling developers to test their apps against various models, including frontier models like GPT-5, and view them in different display modes. MCPJam aims to streamline the development process for AI applications by providing a comprehensive local testing environment.
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MCPJam Inspector FAQ
What is MCPJam Inspector?
MCPJam Inspector is a local development tool designed for building and testing ChatGPT Apps SDK and MCP (ext-apps) applications. It provides an emulator that simulates ChatGPT's behavior, exposing all `windows.openai` API calls and JSON-RPC traffic, similar to Chrome DevTools for web applications. This allows developers to rapidly iterate on their apps without needing an ngrok tunnel or a ChatGPT subscription. The tool also includes an OAuth debugger to visualize and verify MCP authorization flows against the MCP specification. Additionally, its LLM playground offers 1:1 emulation with ChatGPT, enabling developers to test their apps against various models, including frontier models like GPT-5, and view them in different display modes. MCPJam aims to streamline the development process for AI applications by providing a comprehensive local testing environment.
Does MCPJam Inspector have a free plan?
Yes, MCPJam Inspector offers a free plan with limited features. Paid plans are available for users who need more advanced functionality.
How much does MCPJam Inspector cost?
MCPJam Inspector offers a freemium pricing model with a free tier available. Visit their pricing page for detailed information on paid plans and features.
Who should use MCPJam Inspector?
MCPJam Inspector is designed for professionals and teams looking for test and develop chatgpt and mcp apps locally without ngrok or chatgpt subscription.. It's particularly useful for businesses that need reliable and efficient solutions in their workflow.
What are the alternatives to MCPJam Inspector?
There are several alternatives to MCPJam Inspector available on the market. You can compare MCPJam Inspector with similar tools on Toolradar to find the best fit for your needs.
Source: mcpjam.com