Show HN: MCP Playground – free MCP test servers, inspector, and 10K+ server list

MCP 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.