Feature Flag Concepts

Feature flags (also called feature toggles) let you control the availability of features in your application without deploying new code. FlagTGL supports two types of flags: boolean flags that toggle features on or off, and multivariate flags that return one of several string values.

Flags are evaluated per-environment, meaning you can enable a feature in staging while keeping it disabled in production. Combined with targeting rules, flags give you fine-grained control over which users see which features.

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See Boolean Flags and Multivariate Flags for detailed usage of each type.