How to Build Your Own GrowthBook
Replace GrowthBook with a custom build. The #1 Open-Source Feature Flag & Experimentation Platform
Build Difficulty: 4/5
A few focused days to build a solid replacement
Estimated Timeline
Based on 62 features at Few Days difficulty, expect about 3-5 days with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Key Features to Replicate
Top features across 8 categories. See all 62 features
Security(9 features)
Advanced permission controls for team access management
Encrypted endpoints for SDK communication
Enterprise-grade single sign-on capabilities
Export audit logs for compliance and security auditing
Comprehensive audit logs and version control for features
+4 more in this category
Performance(7 features)
Proxy SDK for improved performance and caching
Industry-leading SDKs that are 9kb for JavaScript, less than half the size of competitors. Available for JavaScript, Python, Ruby, PHP with intuitive API for other languages
Performance optimizations for handling large-scale datasets
Pipeline mode for batch experiment evaluation
Query optimizations for high-volume experiments
+2 more in this category
Statistics(7 features)
Robust Bayesian statistical engine for experiment analysis
CUPED variance reduction technique to run experiments faster
Robust Frequentist statistical engine for experiment analysis
Advanced metric corrections including Benjamini-Hochberg and Bonferroni methods
Post-stratification analysis for improved experiment results
+2 more in this category
Analytics(6 features)
Advanced metric calculation and analysis capabilities
Customizable metric library to match exact needs
Insights across multiple experiments for comprehensive understanding
Add custom fields and metadata to experiments
Manage metric fact tables within the platform
+1 more in this category
Support(6 features)
Email support channel
Live in-app chat support for users
Onboarding and training programs for teams
Accelerated roadmap development for enterprise customers
SLA guarantees for enterprise customers
+1 more in this category
Testing(5 features)
Simulate feature flag values for testing
Holdout group management for long-term experiment tracking
Multi-arm bandit testing capabilities for adaptive experimentation
Sticky bucketing for consistent user assignment across experiments
Run A/B tests on your website without requiring engineering support or code changes using a no-code visual editor
Deployment(4 features)
Multi-tenant mode for self-hosted installations
Safe rollout management for feature deployment
Schedule feature flag deployments and rollouts
Self-host for ultimate control and security
Integration(4 features)
Integrates with existing data warehouse so you can analyze all your product data in one place with total transparency and lowest cost
Built-in support for common event trackers with customizable APIs for unique data needs
Slack integration for notifications and updates
Multiple SDK webhooks for integration with external systems
Cost Calculator
Keep Paying GrowthBook
Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 62 features at easy complexity.