Made for the Apple ecosystem

KATER ZERRO is built around the parts of the iPhone that are already useful to you. Apple Health holds the data you permit, a widget keeps the month visible, and Siri and Shortcuts make logging faster when your hands are busy.

That integration is practical rather than decorative. The app asks for specific Health permissions, uses the system’s familiar controls and keeps every route tied back to the same local drinking record.

Your choices stay in your hands: enable only the health metrics you want, remove access in the Health app whenever you like, and use the app without creating a separate profile or handing over your history to a service.

The result is an alcohol tracker that behaves like part of the iPhone rather than a generic tracker squeezed onto it. The tools are there when they help, and out of the way when they do not.