We shipped so many new features in our June Launch Month that we decided that it deserved a major version increase. Version 4.0 brings a huge array of new features. Here’s a quick summary of everything it includes.
GrowthBook MCP Server
AI tools like Cursor can now interact with GrowthBook via our new MCP server. Create feature flags, check the status of running experiments, clean up stale code, and more.
Safer Rollouts
Building upon our Safe Rollouts release last version, we added gradual traffic ramp up, auto rollback, a smart update schedule, and a time series view of results. All of these combine to add even more safety around your feature releases.
Decision Criteria
You can now customize the shipping recommendation logic for experiments. Choose from a “Clear Signals” model, a “Do No Harm” model, or define your own from scratch.
Search Filters
We’ve revamped the search experience within GrowthBook to make it easier to find feature flags, metrics, and experiments. Easily filter by project, owner, tag, type, and more.
Insights Section
We added a brand new left nav section called “Insights” with a bunch of tools to help you learn from your past experiments.
- The Dashboard shows velocity, win rate, and scaled metric impact by project.
- Learnings is a searchable knowledge base of all of your completed experiments.
- The Experiment Timeline shows when experiments were running and how they overlapped with each other.
- Metric Effects lists the experiments that had the biggest impact on a specific metric.
- Metric Correlations let you see how two metrics move in relation to each other.
SQL Explorer
We launched a lightweight SQL console and BI tool to explore and visualize your data directly within GrowthBook, without needing to switch to another platform like Looker.
Managed Warehouse
GrowthBook Cloud now offers a fully managed ClickHouse database that is deeply integrated with the product. It’s the fastest way to start collecting data and running experiments on GrowthBook. You still get raw SQL access and all the benefits of a warehouse native product, without the setup and maintenance cost.
Feature Flag Usage
See analytics about how your feature flags are being evaluated in your app in real time. This is built on top of the new Managed Warehouse on GrowthBook Cloud and is a game changer for debugging and QA.
Vercel Flags SDK
GrowthBook now has an official provider for the Vercel Flags SDK. This is now the easiest way to add server-side feature flags to any Next.js project. We have an even deeper Vercel integration coming soon to make this experience even more seamless.
Official Framer Plugin
You can now easily run GrowthBook experiments inside of your Framer projects. Assign visitors to different versions of your design (like layouts, headlines, or calls to action), track results, and confidently choose the best experience for your audience.
Personalized Landing Page
There’s a new landing page when you first log into GrowthBook. Quickly see any features or experiments that need your attention, pick up where you left off, and learn about advanced GrowthBook functionality to get the most out of the platform.
New Experimentation Left Nav
There’s a new “Experimentation” section in the left nav. Experiments and Bandits now live within this section, along with our Power Calculator, Experiment Templates, and Namespaces. We’ll be expanding this section soon with Holdouts and more, so stay tuned!
REST API Updates
- Filter the listFeatures endpoint by clientKey
- Support partial rule updates in the putFeature endpoint
- New Queries endpoint to retrieve raw SQL queries and results from an experiment
- Added Custom Field support to feature and experiment endpoints
- New endpoints for getting feature code refs
- New endpoint to revert a feature to a specific revision
Performance Improvements
We’ve drastically improved the CPU and memory usage when self-hosting GrowthBook at scale. On GrowthBook Cloud, we’ve seen a roughly 50% reduction during peak load, leading to lower latency and virtually eliminating container failures in production.
