Caffeine tracking
See live mg still active, decaying at your real half-life.
Drink & calorie tracker for iPhone
Log a drink in seconds.
Say it or type it - plain words, any language. OnBoard estimates caffeine, sugar, alcohol, calories, and salt, then tracks what's still active in your body.
Download on theApp StoreFree to download · Requires iOS 26.0 or later
Know what's in you right now
It's not what you drank - it's what's still in your bloodstream
290
Caffeine mg
35
Sugar g
25
Alcohol g
Each fades at its own real speed - watch them clear
Right on your home screen
Widgets tick down in real time
Check what's in you without opening the app
Core features
Everything you need to know what's in you
Alcohol & BAC
Blood alcohol estimate checked against your local legal driving limit.
Sugar & calories
Sugar, calories, and salt tallied automatically from what you log.
Smart limits
Set a daily limit once. OnBoard speaks up only when a drink would put you over.
Sleep protection
Warns you when caffeine would still be active at your bedtime.
Tuned to your body
Sex, weight, age, and country set your personal clearance curve.
How it works
Three steps. One clear picture.
- 1
Set up once
Weight, sex, age, bedtime, country - takes a minute, used for every estimate after.
- 2
Log a drink in seconds
Say or type it in plain words. No menus, no food-database search.
- 3
Watch it clear
Live caffeine and alcohol levels update in the app and your home screen widgets.
Trust and privacy
Real data. Your call on what to log.
Checked against real data
Nutrition databases, government data such as the USDA, and brand-specific sources like Starbucks.
You choose what to log
OnBoard only processes the drink you tell it about, and needs an internet connection to estimate it.
Clear privacy details
Read how your data is handled before you start logging.
Read Privacy Policy →Guides
Learn more about tracking your drinks
How Much Caffeine Is Too Much Per Day? ↗
The 400 mg caffeine ceiling explained - how it breaks down across coffee, tea, energy drin…
How Long Does Caffeine Stay in Your Body? ↗
Caffeine half-life explained - why alertness fades before caffeine does, what changes clea…
How Much Caffeine Is in Coffee? ↗
Espresso, americano, cappuccino, latte, cold brew, and instant coffee all carry different …
How Much Caffeine Is in Tea? ↗
Black tea, green tea, white tea, matcha, oolong, and herbal tea all carry different caffei…
How Much Caffeine Is in Energy Drinks? ↗
Energy drink caffeine varies more than coffee does. Some cans carry twice as much as other…
Coffee vs Energy Drinks ↗
Coffee and energy drinks both increase alertness, but they differ sharply in caffeine conc…
FAQ
Questions before you install
How does OnBoard estimate caffeine and alcohol?
You describe a drink in plain words. OnBoard matches it against nutrition and brand data to estimate caffeine, alcohol, sugar, calories, and salt, then tracks how each one decays over time based on your body.
Is the BAC estimate accurate enough to drive on?
OnBoard's blood alcohol estimate is for awareness only, tuned to your weight, sex, and age. It is not a breathalyzer - never use it to decide whether it's safe to drive.
Does OnBoard work in any language?
Yes. Describe your drink in plain words in your own language and OnBoard will estimate it.
Does it need an internet connection?
Yes. Turning your words into caffeine, alcohol, sugar, and calorie estimates uses an online AI service.
Which drinks can it track?
Coffee, tea, energy drinks, soda, juice, beer, wine, cocktails, and spirits - anything you'd describe in a sentence.
Is OnBoard free?
OnBoard is free to download and includes a 24-hour trial of full tracking, with a subscription to continue.
Drink & calorie tracker for iPhone