Flagsmith
Open-source feature flagging and remote configuration platform for safe releases, A/B testing, and granular control. Supports 15+ SDKs and self-hosting.
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Open-source feature flag tool with remote config & A/B testing, deployable via Docker in under a minute.
Core Features
- Feature flags: safely release and rollback features
- Remote config: toggle features without redeploying
- A/B testing: run multivariate tests using segments
- Segments: target specific users or environments
- 15+ SDKs: support for TypeScript, .NET, Java, etc.
What It Can't Do
- •For production, use external PostgreSQL and Redis; default SQLite is not recommended. Free version lacks enterprise governance features; self-hosted upgrades require manual migration—backup regularly.
Use Cases
- Gradual rollouts of new features
- Remote control for marketing campaigns
- A/B testing to optimize conversion
- Beta access for preview features
Detailed Introduction
Flagsmith is an open-source feature flagging and remote configuration tool that helps teams safely roll out features, run A/B tests, and manage releases without deploying new code. It supports 15+ SDKs (TypeScript, .NET, Java, etc.), offers segmentation, organization management, and can be self-hosted or used as SaaS. With a Docker Compose setup, you can start in under a minute. Its BSD-3-Clause license makes it a strong alternative to proprietary solutions like LaunchDarkly.
Troubleshooting & FAQ (2)
TroubleshootingHow to fix a button that is vertically misaligned with other elements in a flexbox row?
Add align-items-center (Tailwind CSS) or align-items: center (plain CSS) to the outer flex row container. The misalignment happens when row children have different internal layouts—for example, a text+icon Edit button sitting next to an icon-only delete button—giving them different intrinsic heights and baselines. Setting align-items: center on the parent flex container vertically centers all children (toggle, identity name, value chip, buttons) regardless of their content. In Flagsmith, this was fixed in the Edit Feature modal's Identity Overrides tab (web/components/modals/create-feature/tabs/IdentityOverridesTab.tsx, lines 256–262) by adding align-items-center to the row wrapper.
TroubleshootingWhy do imports of 'components/ErrorMessage' resolve to a legacy JavaScript file instead of the TypeScript component, and how to fix it?
The legacy class-based web/components/ErrorMessage.js shadows the modern TypeScript replacement at web/components/messages/ErrorMessage.tsx. Fix: delete web/components/ErrorMessage.js, then either (Option A, minimal diff) create ErrorMessage.tsx as a re-export shim with export { default } from 'components/messages/ErrorMessage', or (Option B) update all imports to point directly to components/messages/ErrorMessage. The TypeScript version has identical props, so it is a drop-in replacement. Verify with npm run typecheck and confirm no runtime errors when triggering error messages.
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Getting Started
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Install the software
Double-click the downloaded installer and follow the prompts
Open terminal and run: curl -o docker-compose.yml https://raw.githubusercontent.com/Flagsmith/flagsmith/main/docker-compose.yml
Run: docker-compose -f docker-compose.yml up
Find the password reset link in logs and visit http://localhost:8000 to set admin password
- Open terminal and run: curl -o docker-compose.yml https://raw.githubusercontent.com/Flagsmith/flagsmith/main/docker-compose.yml
- Run: docker-compose -f docker-compose.yml up
- Find the password reset link in logs and visit http://localhost:8000 to set admin password
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Stop containers: docker-compose down; optionally remove volumes: docker-compose down -v; delete the downloaded docker-compose.yml file.
No Extra Dependencies
Ready to use after download. No additional runtime required.
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