MCP Testing Tools · Free · No Install

Test MCP Servers Online — Free, No Setup

Connect to any remote Model Context Protocol server from your browser. Explore tools, prompts, and resources — then debug with real-time JSON-RPC logs. Browse 10,000+ servers including Supabase, Playwright, Figma, GitHub, and more.

Free MCP playground for developers. Test MCP server tools, validate protocol implementations, and browse tutorials — all from one place, no credit card needed.

HTTP + SSE supportReal-time debug logs30+ AI models
[ MCP AGENT STUDIO ]NEW · FREE CREDITS

Build agents for

One prompt, four models, side-by-side. Pick from pre-built agent templates or wire up any MCP server — remote or local CLI — in seconds.

Free credits on sign-up · no credit card needed

Compare · “Show top 5 open issues”

Claude Sonnet 4.5

BEST ACCURACY
Found 5 open issues. Top priority: "Auth timeout in prod" (P0), "CSV export broken" (P1)…
list_issues()
Latency3.2s
Cost10 cr

GPT-4o mini

FASTESTCHEAPEST
Here are the top 5 open issues sorted by priority: Auth timeout (#312, P0), CSV export (#309, P1)…
list_issues()
Latency1.8s
Cost2 cr
Pick winner →

[ USE CASES ]

Compare Mode

Find the right model for your tools — in one run

Send the same prompt to up to 4 models simultaneously. Watch live tool calls, compare outputs, and let automatic winner ribbons tell you which model is fastest, cheapest, and most accurate.

Try Compare Mode
Compare Mode demo: same prompt running across multiple models in parallel with live tool calls and winner ribbons.
01

Write one prompt

Type the question you want answered using your MCP tools.

02

Pick 2–4 models

Select any combination from 30+ models. Cost estimated upfront.

03

See results live

Streams in parallel. Winner ribbons computed as runs complete.

Compare Models
Best accuracy
C

Claude Sonnet 4.5

3 churned customers found in the last 30 days: 1. Acme Corp — cancelled 12 Apr Last invoice: $2,400 (paid) 2. Blue Ridge LLC — cancelled 8 Apr Last invoice: $890 (failed) 3. Nova Media — cancelled 2 Apr Last invoice: $1,200 (paid)

Tool calls (3)

list_subscriptions312ms
list_invoices198ms
filter_by_status44ms
Latency4.8s
Tool calls3/3
Cost10 cr
FastestCheapest
G

GPT-4o mini

Here are the churned customers: Acme Corp (Apr 12) — last invoice $2,400 Blue Ridge LLC (Apr 8) — last invoice $890 Nova Media (Apr 2) — last invoice $1,200

Tool calls (2)

list_subscriptions201ms
list_invoices144ms
Latency1.9s
Tool calls2/2
Cost2 cr
Best value
Ge

Gemini 3.1 Flash

Based on your Stripe data, 3 subscriptions were cancelled in the past 30 days. • Acme Corp — $2,400 last invoice (paid) • Blue Ridge LLC — $890 (failed ⚠️) • Nova Media — $1,200 (paid)

Tool calls (2)

list_subscriptions260ms
list_invoices180ms
Latency2.4s
Tool calls2/2
Cost2 cr
Best accuracy — highest successful tool-call ratio, fewest redundant calls
Fastest — lowest total wall time from prompt to complete response
Best value — composite of accuracy, speed, and credit cost
Try Compare Mode

No credit card · free credits on sign-up · up to 4 models at once

What you can do

Test Any Remote MCP Server or Client

Get started instantly. No sign-up required. Test your MCP implementation in seconds.

Test MCP Server in Browser

Connect to any remote server and explore its capabilities

Test Remote Servers

Enter any MCP server URL and connect instantly

Browse Tools & Resources

Explore available tools, prompts, and resources

Execute & Debug

Call tools, get prompts, and read resources

Full Request/Response Logs

See all MCP protocol interactions in real-time

Start Testing Server

Why MCP Playground

Instant Testing

No setup, no install. Test in seconds.

Works with Any Server

Test any remote MCP implementation.

Full Protocol Support

Tools, prompts, resources — all supported.

Real-time Logging

See every request and response live.

Ready to get started? Completely free.

Overview

What is MCP Playground?

MCP Playground is a free, browser-based testing tool for the Model Context Protocol (MCP). Test MCP servers, clients, and tools directly in your browser without any installation or configuration.

Supports all core MCP features including tools, prompts, and resources. Connect to any remote server, browse capabilities, execute commands, and view real-time request/response logs.

Benefits

Why Use It for Testing?

Traditional MCP testing requires local setup, dependencies, and configuration. MCP Playground eliminates all of this — just enter a server URL and start testing.

Perfect for validating server implementations, testing tools before deployment, or exploring the MCP servers list. Works with any standard MCP server that supports remote connections.

Features

Key Features

Browser-Based

No software to install

Remote Servers

Connect via URL

Full Protocol

Tools, prompts, resources

Real-Time Logs

Live request/response

10000+ Servers

Official MCP Registry

Free & Open

No limits, no sign-up

Guide

How to Test MCP Servers

1

Navigate to the MCP server testing page

2

Enter your MCP server URL (add auth token if needed)

3

Click Connect to establish a connection

4

Browse tools, execute commands, view logs

Ready to test? Start testing MCP servers, explore the server registry, or validate your client. features remain free — no registration required.