Replane is an open-source configuration management platform that decouples config changes from code deployments . It allows teams to manage feature flags, application settings, rate limits, and operational parameters in one place . Changes propagate instantly to connected applications via Server-Sent Events (SSE) without requiring a restart or redeploy . Key features include version history with instant rollback, JSON schema validation, override rules for user targeting, and optional change approval workflows . It offers official SDKs for JavaScript/TypeScript, React, Next.js, Svelte, Python, and .NET