Flagsmith
Open source feature flag and remote config service
Founded
2019
Starting Price
$0
Category
Developer Tools
Last updated April 27, 2026
About Flagsmith
Flagsmith is an open source feature flag and remote config service that makes it easy to manage features across web, mobile, and server-side applications. It offers both a cloud-hosted and self-hosted option with a clean UI and robust API.
Pros & Cons
Pros
- Easy to set up — can be running in under five minutes
- Clean and intuitive UI for managing flags and remote config
- Affordable pricing with a generous free tier
- Open source with self-hosted option for full data control
- Excellent customer support with fast response times
Key Features
Feature Flags
Toggle features on or off for different environments, users, and segments
Remote Config
Change the configuration of your app in real time without redeploying
User Segmentation
Create segments based on user traits and target features to specific groups
A/B Testing
Run multivariate tests by combining feature flags with analytics integrations
Audit Logs
Track all changes to flags and configurations with a complete audit trail
SDKs & Integrations
Client and server SDKs for all major languages plus integrations with analytics tools
Self-Hosted Option
Deploy on your own infrastructure with the open source version for full control
Pricing
Free
$0
- 50,000 requests/month
- 1 user
- 1 project
- Unlimited flags
- Community support
Best For
Feature Rollouts
Gradually release features to users with percentage-based rollouts and kill switches
Remote Configuration
Update app settings in real time without code deployments
A/B Testing
Test feature variants with user segments and measure impact through analytics
Multi-Environment Management
Manage flags across development, staging, and production from one dashboard
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