Ask r/ClaudeAI, r/mcp or r/cursor for free MCP servers and the same ten names come back. Most of them are open source and cost nothing to run; a few are free to run but call an API that has its own free tier and limits. Each entry below was checked against its MCPVault listing on 7 September 2026 for the licence, the tool list and the launch command, so "free" here means what the listing shows, not what a thread remembers.
The ten free MCP servers Reddit names most
1. Context7, MIT, Grade A. Current library docs for your agent. The server is free; the hosted API has a free plan of 1,000 calls a month. claude mcp add context7 -- npx -y @upstash/context7-mcp. The most agreed-on pick in every thread. Setup for seven clients is in the Context7 guide.
2. GitHub MCP Server, MIT, Grade A. Issues, pull requests and code search from GitHub's own server. Free with a GitHub account; the hosted endpoint needs no install: claude mcp add --transport http github https://api.githubcopilot.com/mcp/. Threads still recommend the deprecated npm package; use the hosted endpoint.
3. Playwright MCP, Apache 2.0, Grade A. Microsoft's browser automation server. Free, no account. claude mcp add playwright -- npx -y @playwright/mcp@latest. Recommended by anyone doing frontend work.
4. Chrome DevTools MCP, Apache 2.0, Grade A. Debug a live page through the DevTools protocol. Free. claude mcp add chrome-devtools -- npx -y chrome-devtools-mcp@latest.
5. Serena, MIT, Grade A. Symbol-level code navigation and refactoring through language servers. Free; needs Python 3.13 and uv. Recommended by people on large codebases. Setup and the five common fixes are in the Serena guide.
6. Sequential Thinking, MIT, official reference server. Structured planning for long tasks. Free, no account. claude mcp add sequential-thinking -- npx -y @modelcontextprotocol/server-sequential-thinking.
7. Supabase MCP, Apache 2.0, Grade A. Free to run; needs a Supabase project, which has a free tier. claude mcp add --transport http supabase https://mcp.supabase.com/mcp.
8. Postgres MCP Pro, MIT, Grade A. Query and tune any Postgres database. Free; you supply the database URL. claude mcp add postgres -e DATABASE_URI=... -- uvx postgres-mcp.
9. Exa MCP, MIT, Grade A. Semantic web search. Server free; the Exa API has a free credit allowance, then paid. The threads that call it "free" mean the trial.
10. Firecrawl MCP, MIT, Grade A. Web pages as clean markdown. Server free; the Firecrawl API has a free tier with a monthly page limit. Same caveat as Exa.
What Reddit gets wrong about free MCP servers
"Free" often means "the server is free, the API is not." Six of the ten above run against a hosted service. Context7, Supabase, Exa and Firecrawl all have free tiers with limits that a daily Claude Code habit reaches inside a month. Check the API's pricing page, not the server's README, before you depend on it.
More free servers is not better. Every enabled server adds its tool descriptions to the context on every turn, so twelve free servers cost you context before the agent does anything. Run the two or three that change what your agent can do in a normal session; the ranked list for Claude Code covers how many to keep on and how scopes work.
How to verify a server is free before you install it
Open its MCPVault listing. Check the licence in the Signals panel (MIT, Apache 2.0 and BSD mean free to run), the "Is it free?" answer in the FAQ at the bottom of the page, and the tool list, which is verified by a live MCP handshake on verified servers. If the licence reads "None", the project has not published one, and "free" is unknown.
MCPVault grades every server on maintenance, adoption, licence and documentation. You can browse all servers or read how we assign quality grades.