Flagsmith
Flagsmith is an open-source feature flag and remote configuration service for web, mobile, and server-side applications.
Our verdict
Who it's for
Development teams, QA teams, and operations teams can all benefit from Flagsmith.
Who should look elsewhere
Free tier limited to 1 team member, impractical for even small teams
Pros
- +Open-source core with a generous free tier of 50K requests/month
- +Flexible deployment: SaaS, private cloud, on-prem, or fully self-hosted
- +Broad SDK coverage across all major platforms and languages
- +Built-in A/B testing with analytics integrations avoids separate tooling
- +Audit log and change tracking make compliance and rollback straightforward
Cons
- −Free tier limited to 1 team member, impractical for even small teams
- −Lower-tier plans cap features and request volumes
- −Overage pricing can add up at scale
- −Advanced features like SAML/SSO and approval workflows require custom pricing
- −Self-hosted deployment demands Kubernetes expertise and ongoing maintenance
Key features
- ✓Feature flags with instant toggle
- ✓no redeploy required
- ✓Remote configuration to change app behavior in real time
- ✓User segmentation and trait-based targeting
- ✓Percentage-based canary and staged rollouts
- ✓Multivariate flags for A/B/n testing and experimentation
- ✓Full audit log with change tracking and rollback
- ✓Scheduled flags for timed feature releases
- ✓SDKs for 12+ languages including React
- ✓Python
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Free | $0 | month | Up to 50,000 API requests/month; 1 team member; Unlimited feature flags |
| Start-Up | $40 | month | Up to 1,000,000 API requests/month; 3 team members; Unlimited projects |
| Enterprise | — | month | 5,000,000+ API requests/month; 20+ team members; Roles, permissions, and change requests |
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