About this app
**Kater Zerro** compares your drinking days with your sober days using Apple Health data. Discover how different amounts of alcohol are associated with your sleep, heart rate, and recovery. Everything stays local on your iPhone. **Free** • Log drinks in seconds with the app, Siri, or Shortcuts. • Most drinks take just one tap. Favorites, volume, and ABV are remembered. • Fair 7am–7am drinking window for more meaningful comparisons. • Home Screen widget to keep your progress in view. • Explore up to 30 days of trends by drink type, weekday, season, and more. **Go Pro** • Compare days with 0, 2, 4, 6, 8, or 10+ drinks against your own sober baseline. • Unlock trend history beyond 30 days. • Available as a subscription or one-time purchase. Current offers are shown in the App Store. **Privacy first** • No diagnosis. No blood alcohol estimates. No gamification. • No account. No backend. No tracking. No ads. • 100% local on your iPhone. **Terms of Use (EULA)** https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 17, 2026 · 10:41 PM Free
Screenshots
