Flagsmith - Open Source Feature Flag Service
Flagsmith makes it easy to create and manage feature flags. Roll out, segment, and optimise. Stay secure with on-premise and private cloud hosting.
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Flagsmith is an open-source feature flag and remote config service that helps teams manage feature rollouts, segmentation, A/B testing, and optimizations across web, mobile, and server-side applications.
🚀 Overview
Flagsmith provides a unified platform for managing feature flags, enabling safe and rapid software releases without the chaos of traditional deployment methods. Teams can toggle features on or off remotely, segment users for targeted rollouts, run A/B tests, and adjust configurations without redeploying code.
What problem does this project solve? It solves the issues of risky, stressful feature releases by offering granular control, auditing, and rollback capabilities, reducing deployment failures and allowing continuous delivery.
Who is it built for? Development teams, product managers, and engineering organizations using web, mobile, or server apps who need reliable feature management.
Why did you build it? To provide an open-source alternative to proprietary tools like LaunchDarkly, offering flexibility with self-hosting, cost savings, and community-driven improvements for faster, safer shipping.
✨ Key Features
- Feature Flag Management: Wrap code sections with flags to control features across platforms, enabling instant toggles without deployments.
- User Segmentation & Targeting: Granular rules based on traits, behaviors, environments, or percentages for canary releases and targeted exposure.
- A/B & Multivariate Testing: Percentage-based splits integrated with analytics for experimentation and optimization.
- Remote Config: Customize flag values (booleans, strings, JSON) remotely for UI tweaks or logic changes.
- Auditing & Rollbacks: Full change logs and one-click rollbacks for safety.
- Upcoming: Enhanced governance features in enterprise plans.
🛠 Tech Stack
- Frontend: React, TypeScript, JavaScript, SCSS
- Backend: Python, Django, Django REST Framework
- Database: PostgreSQL
- Auth: Custom (Django-based)
- Hosting: Docker, Fly.io, Render, Kubernetes (self-hosted), or SaaS
👥 Who Is This For?
This project is useful for:
- Developers who want to implement safe feature toggles and continuous deployment
- Teams looking for scalable A/B testing and remote configuration
- Indie makers building multi-environment apps needing open-source flexibility
📸 Screenshots / Demo
- Live demo: https://www.flagsmith.com/demo
- GitHub: https://github.com/Flagsmith/flagsmith
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-24
❓ FAQ
Is this project free?
Freemium — Free plan with 50k monthly requests, unlimited flags/environments; self-host open source for free; paid Startup/Scale plans for higher limits, support, and enterprise features.
Is the source code available?
Yes — https://github.com/Flagsmith/flagsmith
Can I contribute?
Yes — Fork the repo, submit PRs following contribution guidelines at https://docs.flagsmith.com/platform/contributing; 124 contributors already.
📬 Contact & Links
- Website: https://flagsmith.com
- GitHub: https://github.com/Flagsmith/flagsmith
- Twitter/X: https://x.com/GetFlagsmith
- Email: support@flagsmith.com
Built with ❤️ and kept warm on WarmIndex.
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