TL;DR - Flagsmith
- Open-source feature flag platform with remote config, segmentation, and built-in A/B testing
- Deploy as SaaS, private cloud, on-prem, or self-hosted with SDKs for 12+ languages
- Free tier includes 50K requests/month; paid plans start at $40/month with up to 1M requests
Pricing: Free plan available
Best for: Growing teams
4.8/5 across review platforms
Pros & Cons
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
- Segmentation and trait storage enable precise per-user targeting
Cons
- Free tier limited to 1 team member — impractical for even small teams
- Start-Up plan caps at 3 team members and 1M requests/month
- Overage pricing at $50 per million requests can add up at scale
- Enterprise features like SAML/SSO and approval workflows require custom pricing
- Self-hosted deployment demands Kubernetes expertise and ongoing maintenance
Ratings Across the Web
4.8(37 reviews)
Ratings aggregated from independent review platforms. Learn more
Key Features
Feature flags with instant toggle — no redeploy requiredRemote configuration to change app behavior in real timeUser segmentation and trait-based targetingPercentage-based canary and staged rolloutsMultivariate flags for A/B/n testing and experimentationFull audit log with change tracking and rollbackScheduled flags for timed feature releasesSDKs for 12+ languages including React, Python, Go, and FlutterSelf-hosted, private cloud, and SaaS deployment optionsThird-party integrations with analytics and monitoring tools
Pricing Plans
Free
$0/month
- Up to 50,000 API requests/month
- 1 team member
- Unlimited feature flags
- Unlimited environments and identities
- Segments and 3rd-party integrations
- A/B testing and API access
Start-Up
$40/month (annual) or $45/month (monthly)
- Up to 1,000,000 API requests/month
- 3 team members
- Unlimited projects
- Email support
- Scheduled flags
- Two-factor authentication
- 14-day free trial
Enterprise
Custom
- 5,000,000+ API requests/month
- 20+ team members
- Roles, permissions, and change requests
- SAML, Okta, ADFS, LDAP authentication
- On-premise or private cloud deployment
- Onboarding, training, and enterprise SLA
- Priority real-time chat and Discord support
About Flagsmith
By Toolradar Team·
Flagsmith is an open-source feature flag and remote configuration service for web, mobile, and server-side applications. It lets teams toggle features on or off without redeploying, roll out changes to specific user segments or percentages, and run multivariate A/B tests with analytics integrations. Flagsmith tracks every flag change in an audit log for easy rollback and supports user trait storage for targeting. Deployment options include SaaS cloud across eight regions, private cloud in your own infrastructure, on-premises with Kubernetes or OpenShift, or fully self-hosted from the open-source repository. SDKs cover React, Node, Python, Go, Ruby, .NET, iOS, Android, Flutter, Rust, PHP, and a REST API.
Reviews
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Flagsmith FAQ
Is Flagsmith open source?
Yes. Flagsmith's core is open source under a BSD 3-Clause license. You can self-host it or use their managed SaaS and private cloud options.
What is the difference between feature flags and remote config in Flagsmith?
Feature flags are boolean toggles that turn features on or off. Remote config lets you change string, number, or JSON values in your application in real time without deploying. Flagsmith supports both in the same interface.
How does Flagsmith pricing work for overages?
If you exceed your plan's monthly API request limit, additional calls are billed at $50 per million requests per month, with volume-based discounts for higher usage.
Can I self-host Flagsmith?
Yes. Flagsmith can be deployed on your own infrastructure using Docker, Kubernetes, or OpenShift. The open-source edition is free; enterprise self-hosted adds SAML, approval workflows, and dedicated support.
Does Flagsmith support A/B testing?
Yes. Multivariate feature flags let you run A/B/n tests and measure results through integrations with analytics platforms like Mixpanel, Amplitude, Heap, and Segment.
Which SDKs does Flagsmith provide?
Flagsmith has SDKs for React, Next.js, Node.js, Python, Ruby, Go, .NET, PHP, Rust, Android/Kotlin, iOS/Swift, and Flutter, plus a REST API for any other platform.
Source: flagsmith.com