How to Build Your Own Flagsmith
Replace Flagsmith with a custom build. Ship Faster and Control Releases with Feature Flag Management
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 49 features at Weekend Project difficulty, expect about One weekend 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 49 features
Developer Tools(13 features)
Official .NET SDK for feature flag integration
Official Android and Kotlin SDK for mobile feature flag integration
Official Flutter SDK for cross-platform mobile feature flag integration
Official Go SDK for feature flag integration
Official iOS SDK for native mobile feature flag integration
+8 more in this category
Security(6 features)
Enterprise SSO support through Active Directory Federation Services
Enterprise directory support through LDAP protocol
Enterprise SSO support through Okta
Control feature management access with role-based permissions and user roles
Enterprise SSO support through SAML protocol
+1 more in this category
Deployment(4 features)
Enterprise-grade SaaS cloud hosting with global optimization across eight regions for minimal latency
Self-host feature flags on-premises or in your own cloud infrastructure with Helm and OpenShift support
Open source codebase available for transparency and community contributions
Fully managed private deployments in any cloud provider and region of choice
Support(4 features)
Email-based technical support included in certain plans
Service level agreements for enterprise deployments
Enterprise on-boarding and training services
Priority technical support via chat, Discord, Slack, and Teams
Governance(3 features)
Maintain unlimited audit log history with tracking of all changes per logged-in team member
Implement change request workflows for governance and security in feature management
Log all changes to features for auditing purposes and enable painless rollback of updates
Integration(3 features)
Integrate with popular customer data platforms and analytics products to analyze test results
Access feature flags through REST API endpoints for integration with external systems
Connect with external tools and platforms
Testing(3 features)
Drive A/B and multivariate tests with percentage splits across two or more variations for precise testing and experimentation
Use multivariate flags to test multiple variations and run A/B/n testing with granular control
Test features in production by creating internal user segments and exposing features only to internal teams
Configuration(2 features)
Create custom fields for feature flag configuration and management
Create and manage unlimited development, staging, and production environments
Cost Calculator
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Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 49 features at very easy complexity.