Featurevisor

Featurevisor is a feature management tool that treats flags, experiment variations and remote configuration values as code. You define them declaratively in a Git repository, build static JSON datafiles in CI, upload them to a CDN or your own server, and let SDKs in your applications evaluate them.

A project is made of attributes, reusable segments for targeting users, features with flag, variation and variable definitions, and independently evaluated global variables. Evaluation happens in the SDK against the context your app supplies, returning on-off flags, string variations for A/B tests and typed variables. SDKs cover JavaScript, React, React Native, Vue, Next.js, Go, Python, PHP, Ruby, Java, Kotlin, Swift, Rust and Elixir, with OpenFeature providers for many of the same languages.

To use it you bring your own Git repository, a CI/CD pipeline such as GitHub Actions and a place to serve the datafiles. This keeps flag changes reviewable through pull requests and avoids a hosted control plane. Featurevisor is written in TypeScript and released under the MIT license.