What is featurectrl

featurectrl is an opinionated open-source feature flag management platform designed with engineers’ experience in mind.

Software engineers are the core users of feature flags, and their experience must come first. That’s why featurectrl is designed differently from other platforms.

• Code-first — flags are defined in code, published to the platform in CI.
• Type-safe — not just to catch bugs, but because types are DX.
• Simple — flags are flags, not JSONs. Less complexity, better UX, better DX.
• Open-source — know what you’re running and self-host whenever it matters.

Concepts

• App — an application (think of it as a project). It groups feature flags and segments, especially useful when you have more than one application.
• Flag — a feature flag. Always a boolean toggle. It has a default value that can be overridden for each environment.
• Environment — a named scope you ship to (e.g. production, staging, dev).
• Segment — a named group of users (e.g. beta, internal). Lets you enable a flag for a specific group rather than everyone in an environment.

How it works

1. Install and integrate the featurectrl SDK in your project.
2. Declare your feature flags and segments in a featurectrl.config.json file.
3. Push your configuration to the platform on deploy using the CLI.
4. Use the featurectrl dashboard to enable/disable feature flags per environment.