GrowthBook

Despite the major version bump, GrowthBook 5.0 does not have any breaking changes and can be upgraded to safely.

A year ago when we released version 4.0, the world of product development looked completely different. Claude Code had just launched, agent skills didn't exist yet, engineers were still writing code by hand. The world today is almost unrecognizable. GrowthBook too has changed rapidly in that time and we wanted to signify the massive improvements over the past year with a new major version.

Agentic Experience

Everything a human can do in the GrowthBook UI, an Agent should be able to do programatically. We aren’t 100% there yet, but this release pushes us much closer to that goal:

• Official Skills for common workflows like starting an experiment, summarizing results, or cleaning up stale flags. Use these in Claude, Cursor, Codex, or wherever else your agents live.
• In-App Assistant with access to the same set of Official Skills, plus context about what page you are currently viewing. Use this to quickly automate tasks in the UI or ask questions about your flags or experiments without leaving GrowthBook.
• GrowthBook CLI - Brand new, with 100% coverage of our public REST API endpoints and a much better agent (and developer) experience.

Feature Flag Governance

Moving at AI speed requires strong guardrails and governance for feature flag changes. GrowthBook already had best-in-class capabilities here, but this release takes it to the next level:

• Custom Hooks V2 can now be configured for individual features and have improved performance, security, and the ability to differentiate between soft warnings and hard blockers.
• JSON Schema validation for string/number flags to enforce min/max values, static enum options, and more.
• Unreachable Rule Detection highlights in the UI when a feature rule is fully or partially unreachable due to conflicting rules above it
• JSON Sparse Patching lets you do partial updates to JSON feature flag values without copy/pasting the entire value.
• Constants let you define a single source of truth for feature values and reference them easily from multiple features and rules.
• Configs are a brand new composable and strongly typed way to build complex JSON flags for remote configuration.
• New Draft Review UX in a dedicated tab on feature pages help you quickly review proposed draft changes

Product Analytics

We launched Product Analytics in beta in GrowthBook 4.2. Since then, we’ve been hard at work fixing bugs, adding new features, and improving the UX. We still have a lot more planned, but we’re excited in this release to remove the “beta” tag and mark Product Analytics as generally available.

• Funnel Analysis lets you understand how users flow through your product. Define steps and see the drop-off rates as users progress through, filter to specific segments and date ranges, break out by dimensions, and more.
• Resizable Dashboard Blocks let you have full control over the grid in dashboards, including the ability to stack graphs side-by-side.
• Global Date Filters in dashboards and a way to easily compare to past date periods
• Meta Analysis Dashboard Blocks with data about your experimentation program. View your experiment velocity, win rate, or cumulative metric impact side-by-side with all of your other Product Analytics data.

Visual Editor

We built a brand new AI-native Visual Editor from scratch.

• Modern Chrome Extension runs in a dedicated side bar so it doesn’t conflict with your site and has a sleek modern design.
• Prompt-based Experiments let you explain what you want to test on your page and an agent will implement and configure everything for you. It feels like magic.
• Image Hosting on our global CDN to easily test AI-generated image variations on your site.
• Figma Integration to automatically implement designs. Go from mock-up t

<p align="center"><a href="https://www.growthbook.io"><img src="https://cdn.growthbook.io/growthbook-logo@2x.png" width="400px" alt="GrowthBook" /></a></p>

<p align="center"><b>Open Source Feature Flags, Experimentation, and Product Analytics</b></p>

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<a href="https://github.com/growthbook/growthbook/github/actions/workflows/ci.yml"><img src="https://img.shields.io/github/actions/workflow/status/growthbook/growthbook/ci.yml?branch=main" alt="Build Status" height="22"/></a>

<a href="https://github.com/growthbook/growthbook/releases"><img src="https://img.shields.io/github/v/release/growthbook/growthbook?color=blue&sort=semver" alt="Release" height="22"/></a>

<a href="https://slack.growthbook.io?ref=readme-badge"><img src="https://img.shields.io/badge/slack-join-E01E5A?logo=slack" alt="Join us on Slack" height="22"/></a>

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Create a free GrowthBook Cloud account to get started quickly.

Or run it yourself with:

git clone https://github.com/growthbook/growthbook.git
cd growthbook
docker compose up -d

Then visit http://localhost:3000. View the full Self-Hosting Instructions for more details.

GrowthBook Screenshot

Our Philosophy

The top 1% of companies spend thousands of hours building their own in-house experimentation, feature flagging, and analytics platforms.

The other 99% are left paying for expensive 3rd party SaaS tools or hacking together unmaintained open source libraries.

We want to give all companies the flexibility and power of a fully-featured in-house platform without needing to build it themselves.

Major Features

• 🏁 Feature flags with advanced targeting, gradual rollouts, and experiments
• 💻 24 SDKs including React, Python, Android, and iOS. View all
• 🆎 World class experiment stats engine (CUPED, Sequential, Bayesian, Post-Strat, Bandits, SRM checks).
• ❄️ Warehouse Native. Query 11 data sources including BigQuery, Snowflake, and Databricks. View all.
• 🎯 Flexible SQL-backed metric definitions. Simple conversion rates, ratios, quantiles, and more.
• 📊 Built-in Product Analytics suite to build dashboards and share with your team.
• 📝 Document everything with screenshots, custom meta fields, and Markdown throughout.
• 🔔 Webhooks and a full REST API for building integrations and custom workflows.
• 🤖 MCP server to create features, start experiments, clean up stale flags, and more.

Documentation and Support

View the GrowthBook Docs for info on how to configure and use the platform.

Join our Slack community if you get stuck, want to chat, or are thinking of a new feature.

Or email us at hello@growthbook.io if Slack isn't your thing.

We're here to help - and to make GrowthBook even better!

Contributors

We ❤️ all contributions, big and small!

Read CONTRIBUTING.md for how to setup your local development environment.

If you want to, you can reach out via Slack or email and we'll set up a pair programming session to get you started.

License

GrowthBook is an Open Core product. The bulk of the code is under the permissive MIT license. There are several directories that are governed under a separate commercial license, the GrowthBook Enterprise License.

View the LICENSE file in this repository for the full text and details.

GrowthBook Repository Stats