Track what and when.
Tap below when you have a drink. It records the exact local time automatically. You can edit the details afterward.
Each tap adds 1 U.S. standard drink (14 g alcohol) at the time of the tap. Strong beer and generous pours may count as more than one.
Add a drink
Model-based BAC estimate
Enter your weight and physiology setting to enable the educational estimate.
Not a sobriety test. This is a rough calculation, not measured BAC. It can be too low, especially soon after a drink. Never use this number or a consumer breathalyzer to decide whether to drive.
When to use your breathalyzer
20-minute waitAfter finishing your last sip of beer, wine, or spirits, tap below. Do not start the timer when you begin drinking.
Start the timer after your last sip.
Breathalyzer testing directions
- Finish your last drink, then start this timer.
- Wait at least 20 minutes after your last sip. During the wait, do not eat, drink anything, smoke, vape, or use mouthwash.
- After 20 minutes, follow your device's testing instructions, including its required breath sample and measurement units.
- Record the reading in the Daily timeline. Keep it separate from the app's modeled BAC.
Not a sobriety countdown. This only reduces false-high readings from mouth alcohol. Your BAC can still rise; neither result tells you whether it is safe to drive.
Daily timeline
Times between recorded drinks will appear here.
7 days
30 days
overall
Calendar.
Choose a day to see drinks, intervals, readings and symptoms.
Colored dates contain a drink record or symptom entry. A blank date does not mean zero drinks.
History.
Recorded days, newest first. Tap a day to view drinks, intervals, and symptoms.
Profile & backup.
BAC estimate settings
Used only for a simplified calculation. These population averages do not describe everyone accurately.
The formula uses average alcohol distribution factors, not an individual's measured body composition.
Export & restore
Drink, symptom and device-reading records stay in this phone or browser, not in Cloudflare. Back up before changing phones or clearing app storage. Updates on the same Cloudflare URL preserve local records.
About the estimate
One standard U.S. drink = 14 g ethanol. The simplified Widmark calculation assumes immediate absorption and an average clearance of 0.015 BAC percentage points per hour, so the estimate can be misleading before alcohol is fully absorbed or after eating, and individual rates vary. Untimed older entries are deliberately excluded rather than assigned imaginary times.
A device reading is stored as a separate observation. It does not automatically calibrate the estimate or verify a device's accuracy.
Alcohol-related impairment can occur at any displayed BAC. Do not use this app to assess driving or machinery safety.
Drink Log v2.2 • Free • No accounts • No ads • No tracking • Private on-device data