Best Free MCP Servers in 2026: No API Key Required (+ Free Tiers)

MCP servers range from fully free (open source, no account) to expensive (enterprise APIs with usage-based pricing). Over 20,000 servers exist on public registries, and a surprising number are completely free. This guide covers only the free ones — and separates the genuinely free from the "free tier that runs out on day two."

One thing the free vs. paid framing misses: the real cost of MCP is tokens. Every tool definition consumes 500-1,000 tokens of context. A server with 15 tools uses 10,000+ tokens just to describe itself. Keep this in mind when installing multiple servers — even free ones have a context cost.

Fully Free: No Account, No Key, No Limit

These servers run locally. They call no external API. There is nothing to sign up for.

Filesystem MCP Server

What: Read, write, edit, search files and directories.
Why it is free: Anthropic-maintained, uses your local filesystem. No external service.

The most fundamental MCP server. Every workflow that involves files needs this. Scoped to directories you specify — it cannot access files outside the configured paths.

"filesystem": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-filesystem", "/Users/you/projects"]
}

The last argument is the directory scope. Add multiple paths separated by spaces to grant access to several directories.

Playwright MCP

What: Browser automation — navigate, click, fill forms, screenshot, run tests.
Why it is free: Uses Playwright locally. No API, no account.

Turns your AI into a QA engineer. "Test the checkout flow" generates and runs a real browser test. Also useful for taking screenshots of your app in different states.

"playwright": {
  "command": "npx",
  "args": ["-y", "@playwright/mcp"]
}

Requires Playwright browsers: npx playwright install chromium

Docker MCP Server

What: Build, run, inspect, and debug containers.
Why it is free: Uses your local Docker daemon. No external calls.

"Spin up a Redis on port 6380" or "Show me the logs from my postgres container" — manages your entire local dev environment through natural language.

"docker": {
  "command": "npx",
  "args": ["-y", "mcp-server-docker"]
}

Memory MCP Server

What: Persistent memory across conversations via a local knowledge graph.
Why it is free: Stores everything locally. No cloud.

Your AI forgets everything between sessions. Memory MCP fixes that — it persists entities, relationships, and context to disk. Your AI remembers your project's architecture decisions, naming conventions, and preferences.

"memory": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-memory"]
}

Sequential Thinking MCP

What: Structured step-by-step reasoning with revision.
Why it is free: Pure logic — no external calls.

Forces the AI to think in steps rather than jumping to conclusions. Useful for architecture decisions, complex debugging, and planning where a wrong first step cascades. The AI can backtrack and revise earlier steps.

"sequential-thinking": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-sequential-thinking"]
}

PostgreSQL MCP Server

What: Query any Postgres database in natural language.
Why it is free: Connects to your own database. No third-party API.

You provide the connection string to your own database. The AI generates SQL, executes it, returns results. Free because it is your database — the server is open-source.

"postgres": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-postgres"],
  "env": {
    "DATABASE_URL": "postgresql://user:pass@localhost:5432/mydb"
  }
}

Security: Use a read-only database user for any database you care about. The AI can run arbitrary SQL.

SQLite MCP Server

What: Query local SQLite databases.
Why it is free: Local file, no network.

Point it at any .db file. Useful for exploring datasets, debugging local storage, or querying embedded databases.

Redis MCP Server

What: Inspect and manage Redis instances.
Why it is free: Connects to your own Redis.

Check keys, view values, monitor memory. Debugging Redis without memorizing CLI commands.

Free Tier: Account Required, But Generous

These servers call external APIs. They require signup but offer free tiers sufficient for daily use.

Toolradar MCP

Free tier: 100 API calls/day — all 6 tools.
What it does: Search, compare, and get pricing for 8,400+ software tools.

The only MCP server that answers "which tool should I use?" with real data. Editorial scores, verified pricing (checked weekly), G2/Capterra ratings, AI-identified alternatives.

100 calls/day covers roughly 20-30 "find me a tool" conversations — enough for daily use.

"toolradar": {
  "command": "npx",
  "args": ["-y", "toolradar-mcp"],
  "env": {
    "TOOLRADAR_API_KEY": "tr_live_your_key"
  }
}

Get your free key →

Brave Search MCP

Free tier: $5/month in credits (~1,000 queries).
What it does: Real-time web search using Brave's independent index.

About 30 searches/day on average. Enough for most workflows unless you are doing heavy research. Independent from Google — sometimes returns results Google buries.

Get a free key →

Context7 MCP

Free tier: Unlimited for public packages.
What it does: Fetches current, version-specific documentation for libraries.

No API key needed for public packages. If you use React, Next.js, Prisma, Tailwind — Context7 is effectively unlimited and free.

E2B MCP

Free tier: 100 sandbox hours/month.
What it does: Execute code in secure cloud sandboxes.

Run Python, JavaScript, and shell commands in isolated environments. 100 hours = ~3 hours/day. Enough for data analysis and code experimentation.

Supabase MCP

Free tier: If you have a Supabase free-tier project.
What it does: Manage your Supabase project — database, auth, storage.

No additional cost beyond your Supabase plan. If you already use Supabase free tier, the MCP server is free too.

Composio MCP

Free tier: 20,000 tool calls/month.
What it does: Integration hub for 250+ platforms.

Instead of installing 10 separate MCP servers, Composio bundles common integrations (GitHub, Slack, Notion, Jira). The trade-off: less depth per integration, more breadth.

Cost Comparison at a Glance

The Zero-Cost Starter Kit

If you want maximum capability for $0:

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "/Users/you/projects"]
    },
    "memory": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-memory"]
    },
    "context7": {
      "command": "npx",
      "args": ["-y", "@upstash/context7-mcp"]
    },
    "toolradar": {
      "command": "npx",
      "args": ["-y", "toolradar-mcp"],
      "env": {
        "TOOLRADAR_API_KEY": "tr_live_your_key"
      }
    },
    "brave-search": {
      "command": "npx",
      "args": ["-y", "@brave/brave-search-mcp-server"],
      "env": {
        "BRAVE_API_KEY": "your_key"
      }
    }
  }
}

Five servers. Zero monthly cost. Your AI can manage files, remember context, look up current docs, search the web, and recommend software tools with verified data.

Full list: 25 best MCP servers for 2026 →

New to MCP? What is an MCP server? →

Setup guide: How to add MCP servers to Claude Desktop →

Using Claude Code? Best MCP Servers for Claude Code →

Database MCP servers: PostgreSQL, MySQL, MongoDB compared →