How to Build Your Own ConfigCat
Replace ConfigCat with a custom build. Feature Flag Service for Teams
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 32 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 32 features
Security & Compliance(9 features)
Tracks all changes made to feature flags, providing a historical record of who, what, when, and where
Service is GDPR compliant
Service is ISO 27001:2022 certified for information security management
Require a mandatory reason for modifying feature flags, promoting transparency and accountability within your team
SAML-based authentication and user provisioning
+4 more in this category
Core Functionality(4 features)
Manage separate environments in your development lifecycle (e.g., production, staging, development)
Turn features ON/OFF using ConfigCat's Dashboard even after code is deployed
Organize feature flags and environments into products representing applications and teams
Support multiple variations for feature flags and configurations
DevOps & Automation(4 features)
Command-line tool that discovers feature flag usages in your source code and gives advice on the dashboard
Multiple tools available to help minimize tech debt in feature flag management
ConfigCat notifies your application via webhooks when feature flag changes occur
Automated regular emails about feature flags that weren't touched in a while (stale flags)
Targeting(4 features)
Specify a randomly selected fraction of users to whom a feature will be enabled or a different value will be served
Group your users based on any property and assign them to feature flags easily
Set different feature flag or setting values for different users of your applications
Target user segments based on region, email, subscription or any other custom user attribute
Integration(2 features)
SDKs for JavaScript, Angular, React, Vue.js, Bun, Deno, Node.js, .NET, Java, Go, PHP, Laravel, Python, Ruby, Android, iOS, macOS, Flutter, Kotlin Multiplatform, React Native, Chromium Extension, C++, Rust, Swift, Dart, Elixir, Unity, Unreal Engine, and Cloudflare Worker
Manage your feature flags via the ConfigCat Public API
Pricing(2 features)
Tailored feature flag service plan designed for students and educational projects
Tailored feature flag service plan designed for teachers and educational projects
Team Collaboration(2 features)
Create permission groups with different access levels for team members
Organize your team in groups and grant them different permissions
Configuration(1 features)
Set the frequency of config.json downloads from 1 second to several hours
Cost Calculator
Keep Paying ConfigCat
Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 32 features at very easy complexity.