mcptest.io vs MCP Inspector, MCPJam, Glama and Postman
An honest comparison of five MCP testing tools on install, remote OAuth, browser CORS evidence, shareable reports, catalogs, CI and price, with what each does best.
On this page
Five tools are commonly used to test MCP servers: the official MCP Inspector, MCPJam, the Glama inspector, Postman's MCP requests, and mcptest.io. They overlap, but each was built for a different job. This page compares them on the points that most often decide the choice and says plainly where each one is the better fit.
Every row was checked against each product's own documentation on October 20, 2026; links are listed under sources. Tools change quickly, so confirm anything critical against the current docs. mcptest.io is our product, and we have tried to describe the others as their documentation does.
Comparison table
| MCP Inspector | MCPJam | Glama inspector | Postman | mcptest.io | |
|---|---|---|---|---|---|
| Install | npx, Node 22.19 or newer; web UI served from a local backend | Hosted web app with no install, or npx, desktop app (macOS, Windows), Docker | None, runs in the browser | Postman app and a Postman account | None, runs in the browser |
| Local stdio servers | Yes | Yes, except in the hosted web app | Only through a tunnel | Yes | No, remote servers only |
| Remote OAuth | Full flow: dynamic registration, pre-registered client, Client ID Metadata Document, enterprise IdP; step-up scopes | Guided OAuth debugger checking 2025-03-26, 2025-06-18 and 2025-11-25 flows; DCR, pre-registration, CIMD | OAuth 2.1 authorization code with PKCE, dynamic registration, refresh tokens | OAuth via the Authorization tab; step-by-step OAuth 2.1 debugger | OAuth 2.1 with PKCE: pre-registered client, CIMD, DCR; bearer token and API key |
| Browser CORS evidence | No: connections are made by the local Node backend | No: hosted app connects from MCPJam's servers | Partial: connects directly when a server allows browser requests, otherwise through its proxy | No: requests are sent by Postman, not a browser page | Yes: tries a direct browser connection first, records readable headers and cross-origin failures, and falls back to a proxy |
| Shareable results | Protocol and network logs can be exported | Share servers with a team through Projects; eval results in a dashboard | Server configuration saved in the page URL | Requests saved and shared in collections and workspaces | Public report URL per endpoint, JSON and Markdown export, README badges |
| Server catalog | No | No | Glama runs a separate server directory | Postman's public network has an MCP server listing | Yes, about 110 public remote servers with periodic validation |
| CI usage | CLI with JSON output, stable exit codes and --stored-auth-only | CLI health checks, conformance suites with JUnit output, hosted evals, GitHub Action | Not documented | Postman CLI does not run MCP requests | Headless CLI from the open-source repository with JSON/Markdown reports and gate exit codes |
| Price | Free, open source | Free to start; hosted usage has a daily allowance and paid credits; inspector is Apache-2.0 | Free | Free plan for one user; paid plans from $9 per user per month, billed annually | Free, MIT licensed |
MCP Inspector
The official inspector is the reference client maintained by the MCP project. It ships one package with three surfaces: a web UI, a scriptable CLI and a terminal UI, all sharing the same connection code and OAuth state.
Where it is better. It is the strongest choice for local stdio servers, which mcptest.io cannot reach at all. It tracks the specification closely, supports both protocol eras, renders MCP Apps in a sandbox and exposes almost every protocol feature, including tasks, subscriptions and resource templates. Its CLI is well suited to CI: one method per run, JSON output and an exit code per failure class.
Trade-offs. It runs on your machine and needs a recent Node.js. Because the web UI's backend makes the connections, it cannot tell you whether a server would work from a browser.
MCPJam
MCPJam is an open-source inspector with a hosted web app and local installs. Its distinctive feature is an LLM playground: you can chat with frontier models against your server's tools, compare up to three models side by side, and run evaluations.
Where it is better. If your question is "will a model use my tools correctly?", MCPJam answers it directly; mcptest.io does not run a language model. Its OAuth debugger walks through each step of the flow and checks conformance across three protocol revisions. Its CLI covers health checks, conformance suites and evals in GitHub Actions and GitLab CI, and can comment on pull requests.
Trade-offs. The hosted app reaches servers from MCPJam's servers, so it reports server-side reachability, not browser behaviour, and model usage beyond the daily allowance consumes credits.
Glama inspector
Glama's inspector is a free page on glama.ai that connects to Streamable HTTP and SSE servers from the browser, with no account required.
Where it is better. It is quick: paste a URL and go. Saving the whole configuration in the page URL makes it easy to bookmark a setup. Glama also runs a large server directory alongside it.
Trade-offs. Its documentation does not describe a CLI or CI usage, and it does not say when traffic goes through its proxy rather than directly. Because the configuration lives in the URL, its own page warns you to remove secrets before sharing a link.
Postman
Postman added MCP requests to its API platform. You create an MCP request in a workspace, choose stdio or Streamable HTTP, load the server's capabilities and call tools, prompts and resources.
Where it is better. Teams already organizing API work in Postman can keep MCP requests in the same collections, environments and workspaces. Its OAuth debugger shows each request and response in the OAuth 2.1 flow. It can also export a server configuration for MCP hosts.
Trade-offs. The Postman CLI's collection runner supports HTTP, gRPC and GraphQL requests only, so MCP requests cannot be run in CI that way. Sharing beyond one user is a paid-plan feature.
mcptest.io
mcptest.io is a browser-based inspector, playground and evaluator for remote MCP servers, with a public catalog.
Where it is better. It needs no install and no account, so it works from any machine, including a locked-down work laptop. It is the only tool here that records what a browser actually experiences: whether cross-origin requests succeed and which response headers are readable, evidence that matters if your server should work in web-based clients. Each endpoint gets a shareable report with JSON and Markdown export and an embeddable badge, and the catalog lists public servers with their latest validation. A headless CLI applies the same release-gate rules in CI.
Trade-offs. It cannot test local stdio servers, it does not run a language model against your tools, and the headless CLI currently runs from a checkout of the repository rather than a published package. Interactive OAuth is not available in headless runs; supply a bearer token or API key instead. Anonymous use of its CORS proxy is rate-limited, and signing in raises the limits.
Which one to choose
- Building a local stdio server: MCP Inspector, or Postman if your team already uses it.
- Checking how models use your tools: MCPJam.
- Checking that a remote server works from a browser, or sharing a report link: mcptest.io.
- A quick look at a public endpoint: Glama or mcptest.io.
- CI: MCP Inspector CLI, MCPJam CLI or the mcptest.io headless gate, depending on whether you need raw protocol checks, model evals or a release decision.
Many teams use two of these. The testing guide describes a full test pass that combines a browser client with a second client for stdio.
Try it on a real server
Open Context7 in the mcptest.io playground, run one of its tools, and then open the same URL in any of the other tools to compare what each one shows.