iOS · watchOS · Coming soon
Alculator
Log a drink. Watch the curve rise. Get a tap on the wrist the moment you’re clear.
- Widmark formula
- On-device only
- Watch haptics
- iPhone · watchOS
Every calculation happens on your phone. Nothing leaves the device.
Feature 01
Live BAC card
Your current blood alcohol level, calculated in real time with the Widmark formula. A countdown tells you exactly when you hit zero.
- Widmark formula using sex, age and weight
- Three states: idle, rising, clearing
- Conservative mode alerts at 80% of the legal limit
- IE/EU, UK and zero-tolerance limits
Right now
0.062
Blood alcohol (‰)
Clearing · above limit
- Clear in
- 2h 14m
- Peak
- 0.094
- Drinks
- 3
- Beer
- Wine
- Spirit
- Custom
Feature 02
BAC curve
A live chart of the whole session, from first drink to zero. The projected elimination curve redraws every time you add a drink.
- Full session chart with projected curve
- Legal limit drawn on the graph
- History of past sessions with peak BAC
Session BAC
0.062
Safe to drive in 2h 14m
Feature 03
Apple Watch companion
The watch is a terminal, not a second app. See your live BAC ring, log a drink in two taps, and feel a haptic the moment you're safe to drive.
- Live BAC ring on the watch face
- Drink picker with haptic confirmation
- Safe-to-drive haptic notification
- The iPhone does the actual work
Safe to drive
2:14
Safe to drive
BAC 0.000
Feature 04
Private by design
Every calculation runs on your device against your own profile. Nothing is sent to a server. Nothing is stored anywhere but your phone.
- Zero network requests during a session
- Profile stored locally on device
- Apple Health integration planned
- Save or discard sessions, your call
Settings
Your profile
- Legal limit
- IE/EU · 0.050
- Conservative mode
- On
- Notifications
- Enabled
Privacy
All data is stored on this device. No account required. Nothing is ever sent to a server.
Where it’s at
- iPhone
- Design complete · Xcode next
- Apple Watch
- Design complete · Xcode next
- Apple Health
- Integration planned
Know when you’re clear.
Alculator is coming to the App Store. Be the first to know when it lands.
Notify me