A tool for querying system function results and browsing feature flags on Apple's platforms.
The Packets tab (system function querying) is currently under construction, as part of reworks for feature flag support.
macOS: Fully supports controlling and adding feature flags
Other platforms (iOS, iPadOS, visionOS...): Can browse registered feature flags and view their states. Can not control feature flags, unless internal, jailbroken or exploited.

