One thing I've intentionally done with FeatureFlags.app is keep the UI simple. There are feature flag platforms with enough knobs, switches, targeting rules, analytics, experimentation tools, dashboards, and configuration options to qualify as a small enterprise ERP system. And that's great... if you need all of that. But most teams don't.
If you're a .NET team that mostly needs to:
Turn features on and off
Roll features out gradually
Target a few users
Manage different environments
Disable something without redeploying
... you probably don't need 47 configuration screens to accomplish it.
FeatureFlags.app is built around that idea: give developers the feature flag functionality they actually need without making them learn an entire feature management platform.
It integrates with Microsoft's Feature Management libraries, so the application side stays familiar. The UI handles the configuration without making you wrestle with JSON files or build a feature flag PhD. I'm deliberately leaving some of the bells and whistles on the shelf. Because sometimes the best feature is not having 37 features you don't need.
That's the philosophy behind FeatureFlags.app.