Start free, go further with PRO

Recording your drinks does not stop at a paywall. The free version of KATER ZERRO lets you log every drink, mark Dry Days and review your recent history and trends.

For a longer view, PRO unlocks all trend periods beyond 30 days. That gives a fuller picture when you want to compare seasons, months or a year instead of only the last few weeks.

PRO also opens Hangover Day insights. With the Apple Health permissions you choose, those views compare sleep and recovery signals after drinking with your own alcohol-free baseline; they are for self-observation, not medical advice.

The basic habit stays the same in either version: log honestly, look back when it helps and keep your data on your iPhone. PRO adds depth to that record, not a different way of tracking.