When2DriveSober
Alcohol Timeline & Drive Limit
Free · Designed for iPad. Not verified for macOS.
Estimate when you may be below your country's driving limit. Record drinks in seconds, track multiple people and follow your progress with clear countdowns and alerts.
This app helps you estimate when your blood alcohol level may be below your selected country's driving limit.
Fully free to use — no subscriptions or hidden costs.*
Choose your country, record drinks and follow an estimated timeline showing how alcohol may change throughout the day or night.
The app focuses on timelines, transparency and cautious estimates, helping you understand how alcohol may rise and reduce over time using a safety-first approach.
View your estimated alcohol timeline, record drinks quickly and see estimated key times including when you may be below your selected driving limit.
IMPORTANT
This app provides estimates only and should never be relied upon to determine legal fitness to drive.
FEATURES
Estimated BAC Timeline
• Visual alcohol timeline
• Estimated rise and reduction over time
• Local driving limit line
• Red / amber / green risk zones
• Key estimated times
Safety-First Calculations
• Conservative assumptions
• Upper drink strength used for ranges
• Food slows absorption timing rather than reducing alcohol
• Designed to avoid false reassurance
Detailed Alcohol Estimate
Understand how the estimate changes over time.
View:
• Estimated BAC
• Alcohol absorbed
• Alcohol processed
• Net change
• Drinks added in each period
• UK alcohol units
• Risk status
Fast Drink Recording
Quick category-based drink logging:
• Beer / Lager / Cider
• Wine & Sparkling
• Spirits
• Cocktails / Mixed Drinks
• Food / Meals
Save favourite drinks for faster logging.
Personal Profiles
• Optional profile setup
• Gender and build selection
• Advanced profile options
• Country-specific driving limits
Country & Regional Driving Limits
Includes support for:
• UK (including Scotland lower limit)
• Europe / EEA
• Switzerland
• Norway
• Canada
• New Zealand
• South Africa
• Japan
• Hong Kong
DESIGNED FOR REAL LIFE
• Quick to use
• Native iOS design
• iPhone and iPad support
• Dark mode support
• Simple but detailed
• Safety-first approach
IMPORTANT DISCLAIMER
This app provides estimates only. It cannot determine legal or medical fitness to drive. Alcohol affects people differently. If you have been drinking, the safest option is not to drive.
*This app is fully free to use with no subscriptions or hidden costs. Small adverts are shown to help support development and keep the app free.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
- Added Home Screen widgets.
- Added Live Activities for active sessions.
- Smarter notifications and countdowns.
- Improved timeline and countdown display.
- UI improvements and bug fixes.
The developer, Thomas Portlock, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Thomas Portlock
- Size
- 11.9 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- iPhone
- Languages
English and 13 more
- English, Danish, Dutch, French, German, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Simplified Chinese, Spanish, Swedish
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment Information
Alcohol, Tobacco, Drug Use or References
Contains
Health or Wellness Topics
- Copyright
- © Thomas Portlock 2026