Show HN: MCP Playground – free MCP test servers, inspector, and 10K+ server list
mcpplaygroundonline.comMCP Playground is a Postman-style tool for MCP — inspect servers, execute tools live, test your client, all from the browser.
Four things in one place:
1. Free hosted MCP servers — four public test servers anyone can point their client at: Echo (connectivity), Auth (Bearer token flow), Error (error handling), Complex (multi-tool schemas).No sign-up, just use the URL.
2. Server inspector — paste any remote MCP server URL, see all its tools/resources/prompts, execute them live, inspect the full JSON-RPC log. HTTP, SSE, and WebSocket all supported.
3. Registry — 10,000+ servers indexed by category. Each links to the repo and can be tested in the inspector directly.
4. Recipes + guides — 45 articles and step-by-step workflows for real use cases: GitHub PR reviewer, standup bot, database query assistant, Meta ads automation, and more.
Everything free, no install, no sign-up.
Happy to answer questions on the implementation. Any plan to support ws transport ? A few newer mcp servers are moving away from SSE yes, it’s in the pipeline. I liked the recipe part though especially the Meta Ads one, you can keep it open for others to contribute as well—it could help increase engagement. Noted. Thanks How is this different from MCP Inspector? Inspector is the right tool for local STDIO servers — use it. We're complementary, not competing. MCP Playground fills a different gap: no install (browser tab, nothing to run), built for remote HTTP/SSE endpoints rather than local processes, and includes hosted test servers so you can verify your client implementation without needing a server at all. Plus a registry if you're trying to discover what's out there. Inspector ideal for: STDIO, local debugging, open source, deeper protocol introspection.
MCP Playground for: zero setup, remote servers, client testing, browsing mcp registry/server list. Add a dark mode Noted. Thanks for the feedback.