workflowstacks
mcp-server

Open SEO

Open source alternative to Semrush and Ahrefs
13,039 stars1,483 forksTypeScriptUpdated 8/19/2026100% free · open source
What it does

Open‑SEO is a self‑hosted API that crawls any URL and returns the same keyword, backlink and site‑audit data you’d get from Semrush or Ahrefs.

When to use it
  • •You need SEO metrics for dozens of competitor sites but can’t afford a SaaS subscription.
  • •You want to embed keyword difficulty, search volume, and backlink counts directly into your product’s dashboard.
  • •You require full control over data privacy and want to run SEO analysis on‑premise.
Ready-to-paste prompt
curl "http://localhost:3000/api/site-audit?url=https://example.com" -H "Authorization: Bearer $(cat .env | grep API_TOKEN | cut -d '=' -f2)"
Heads up: The server requires a valid SERP provider key (Google/SerpAPI) set in `SERP_API_KEY` – without it the keyword‑search endpoints will return 401 errors.
Saves to your device
Use with Claude
New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

⚡ Runs out of the box

A prompt/skill package — nothing to install beyond adding it to your AI tool.

Try it instantly — no install
Claude Code
mkdir -p ~/.claude/skills/open-seo && curl -fsSL https://workflowstacks.com/api/skills/open-seo/claude-skill -o ~/.claude/skills/open-seo/SKILL.md
Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)
claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How Open SEO works
Codeflow
Free to inspect

Open SEO is a very large TypeScript project (~117k lines across 986 code files, plus 17 test files). You install it into your AI tool with one command; there is nothing to run yourself. Last commit this month, MIT license, has a test suite.

Size
Very large codebase
~117k lines · 986 code files · days to read — use, don't read
Setup
Install as a skill / plugin
Add it to Claude Code (or your AI tool) with one command — 29 skills inside. Nothing to run yourself.
Runs on
Inside your AI tool
Helper scripts use Node.js · Docker · needs API keys
TypeScript 96%MDX 2%CSS 1%JavaScript 1%
Where to start reading
  1. 1
    README.md
    Start here — what it does and how to install it
  2. 2
    AGENTS.md
    The instructions the AI actually follows
  3. 3
    src/start.ts
    Where the program starts running
  4. 4
    .env.example
    The API keys and settings you must provide
  5. 5
    src/db/index.ts
    Inside src/ — the main logic begins here
What's in each folder
src/Core code — the actual logic794 files
web/Frontend / UI172 files
plugins/Sub-packages / plugins15 files
docs/Documentation15 files
drizzle/Folder91 files
drizzle-pg/Folder47 files
badseo/Folder36 files
release-notes/Folder36 files
READMEHas testsDocumentedCI checksDocker readyMIT licenseUpdated this month
Quick Actions
Details
Creator
every-app
Language
TypeScript
Category
mcp-server
Published
2/27/2026

Are you the creator of this tool? Claim your listing → and earn 85% of every sale.

Ready-to-run pack · one-time $29

Rank Tracker

A weekly email of where you actually rank on Google.

Includes the tested workflow and a written setup playbook. Needs: SerpAPI key (free tier).

See what you get

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