Flagsmith

Open Source Feature Flag Service

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Flagsmith is a feature flag and remote configuration platform. Teams can create and manage feature flags across web, mobile, and server-side applications, target releases by user segments or percentage rollouts, run A/B and multivariate tests, and use remote config to change application behavior without redeploying. It is available as a hosted cloud service, private cloud, or self-hosted on-premise deployment, and the core product is open source (MIT-licensed). SDKs are available for JavaScript, React, Node.js, Python, Go, Ruby, .NET, PHP, Flutter, iOS, Android, Kotlin, and Rust, and it is OpenFeature compatible. Flagsmith also provides an MCP server for AI agents and integrates with tools such as Datadog, New Relic, Amplitude, and Jira.

Category: DevOps & CI/CD
Pricing: freemium
Free tier: yes
API: yes
MCP server: yes
SDK: yes
Open source: yes

#feature flags #remote config #a/b testing #open source #self-hosted #sdks #openfeature #mcp server

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Listed 2026-10-22 · last verified 2026-10-22 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.95

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