devtools

Growthbook: Optimize with Data

Name: Growthbook: Optimize with Data
Author: growthbook

Get feature flags and analytics with Growthbook, a tool.

intermediate⏱ 30 minutes💵 Free + open-source

8,356 stars840 forksTypeScriptUpdated 9/14/2026100% free · open source

What it is

Use Growthbook to set up and track feature flags and experiments for your product.

Real use case example

"A founder uses Growthbook to create an experiment: Step 1: Set up a new feature flag in Growthbook, Step 2: Use Growthbook's API to turn on the feature in 20% of their user base, Step 3: Track the results and decide to launch the feature company-wide when it shows a 10% increase in engagement."

Best insideClaude DesktopClaude CodeGPT (ChatGPT)Gemini

When to use it

•When you need to roll out new features to a subset of users for testing
•When you want to measure the impact of changes to your product on user behavior
•When you need to manage multiple versions of your product or features for A/B testing

Ready-to-paste prompt

npx @growthbook/growthbook init --db-uri mongodb://localhost:27017 --api-port 3000

Saves to your device

Use with Claude

New

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

🛠️ Technical setup

Expect 20–40 minutes in a terminal — or let your AI agent drive it.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/growthbook && curl -fsSL https://workflowstacks.com/api/skills/growthbook/claude-skill -o ~/.claude/skills/growthbook/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 Growthbook: Optimize with Data works

Codeflow

Free to inspect

Growthbook: Optimize with Data is a very large TypeScript project (~648k lines across 3067 code files, plus 614 test files). It is a full software project: use it through its install path rather than reading it end to end. Last commit this month, Other license, has a test suite.

Size

Very large codebase

~648k lines · 3067 code files · days to read — use, don't read

Setup

Developer setup

A real software project. Use it via its install path; don't expect to read it all.

Runs on

Node.js · Docker

No API keys detected

TypeScript 97%Python 1%SCSS 1%

Where to start reading

1
README.md
Start here — what it does and how to install it
2
AGENTS.md
The instructions the AI actually follows
3
bin/yarn
Where the program starts running
4
package.json
Dependencies and the commands it exposes

What's in each folder

bin/Command-line entry points1 files

docs/Documentation1300 files

packages/front-end/Package1894 files

packages/back-end/Package1523 files

packages/shared/Package485 files

packages/sdk-js/Package51 files

packages/stats/Package37 files

charts/Folder21 files

READMEHas testsDocumentedCI checksDocker readyOther licenseUpdated this month

Use with Claude

New

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

🛠️ Technical setup

Expect 20–40 minutes in a terminal — or let your AI agent drive it.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/growthbook && curl -fsSL https://workflowstacks.com/api/skills/growthbook/claude-skill -o ~/.claude/skills/growthbook/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.

Quick Actions

Details

Creator

growthbook

Language

TypeScript