Permille
BAC, caffeine & water
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Permille keeps track of what you drink — and how it affects you. Use it for alcohol only, for caffeine only, or for both. It follows your lead: drink coffee in the morning and you see the caffeine reading. Go out at night and you see your blood-alcohol level. Do both and you see both, side by side.
ALCOHOL IN VIEW
• Blood-alcohol estimate using the Widmark formula — with a traffic-light status and estimated time back to 0.0 ‰.
• The value rises gradually while you drink and comes down naturally — across midnight, too.
• Water guidance: alcohol is dehydrating — the app shows how much water still helps and gently reminds you.
• When it gets heavy, you get tips for getting home safely.
CAFFEINE IN VIEW
• How much caffeine is in you right now — calculated from its half-life, not just added up.
• The answer that matters: when you can fall asleep well again, and when it has fully worn off.
• A heads-up when you go past the 400 mg daily guideline.
• Coffee, espresso, cappuccino, latte, cold brew, matcha, tea, cola, mate and the common energy drinks in the usual sizes — each with and without sugar.
BOTH TOGETHER
• Vodka Energy or an Espresso Martini? The app works out alcohol and caffeine separately from the same drink.
• Worth knowing: caffeine masks tiredness, not the alcohol. The app says so whenever both are in play.
• A coffee never counts as alcohol — your dry days and stamp card stay untouched.
ALSO INSIDE
• Daily totals: alcohol, caffeine, sugar, calories and cost.
• Mixer: build your own drinks from an ingredient library and see every value live.
• History & stats: your evening's curve, weekly and monthly figures, spending and patterns.
• Optional breathalyzer cross-check, Apple Health sync and Home/Lock-Screen widgets.
OUT TOGETHER
• Friends round with a six-character code: see each other's drinks, estimated blood alcohol and water.
• “Look after …”: a heads-up when someone is estimated to have drunk a lot or quickly.
• “I'm home” – your round sees a house next to your name.
• Several rounds at once, and after the trip a recap stays on your iPhone.
MINDFUL, NOT ENCOURAGING
Permille is built for harm reduction: water, breaks and nutrition transparency come first.
YOUR DATA STAYS WITH YOU
Your entries are stored on your iPhone. Only if you join a friends round do you share your status with it via iCloud – and only while you're in it. Members keep a recap of the round on their iPhone afterwards. No account, no ads. Anonymous usage statistics (can be turned off) help improve the app.
IMPORTANT
Blood-alcohol and caffeine values are rough estimates, NOT a measuring device. Use at your own risk, without warranty. Never use it as a basis for driving — 0.0 ‰ always applies behind the wheel. It does not replace medical advice. For adults only. Excessive alcohol consumption harms your health.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
New in 2.0
• Friends round: go out together with a code – keep an eye on the others' drinks, estimated blood alcohol and water
• “Look after …”: a heads-up when someone is estimated to have drunk a lot or quickly
• “I'm home”, several rounds at once and a recap after the trip
• Continuous blood alcohol and caffeine curve, calendar in History
• Choose the amount with a long press, your own Mixer quick picks
• Log from the Action button, Lock Screen and Control Center (iOS 18 and later)
The developer, Johann Brockstedt, 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 10.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 20 more
- English, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Romanian, Slovak, Slovenian, Spanish, Swedish
- Age Rating
18+
- 18+
- Frequent
Alcohol, Tobacco, Drug Use or References
Contains
User-Generated Content
Health or Wellness Topics
- Provider
Johann Brockstedt
- Johann Brockstedt has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
Burkamp 1
24220 Flintbek
Germany - Phone Number
+49 1624112360 - Email
apple@brockdesign.de
- Copyright
- © 2026 Johann Brockstedt