cafein: fun coffee tracker
Track caffeine. Protect sleep.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Will tonight's coffee cost you sleep? Cafein projects how much caffeine you'll likely still have in your blood at bedtime, with cortisol science to time your morning.
This app helps you use coffee as fuel and prevent it from costing you sleep. Tap one button to log an espresso, matcha, energy drink, or even a Coca-Cola. A real bi-exponential pharmacokinetics model projects how much caffeine you'll likely still have in your bloodstream when you want to be asleep.
WORK WITH YOUR NATURAL CORTISOL
Cafein shows your cortisol awakening response, the natural alertness curve that peaks in the first hour after waking. Drinking coffee inside that window can blunt how strongly caffeine hits. Cafein highlights the window where your first cup tends to land hardest (typically 1.5 to 3.5 hours after wake).
SIMULATE BEFORE YOU SIP
Thinking about a 4 pm espresso? Cafein lets you test combinations without committing. See how that hypothetical second coffee changes your bedtime number, then decide.
BUILD YOUR HEALTH STORY
Every cup syncs to Apple Health. Your data is yours, exportable as CSV any time, ready to share with your doctor or AI assistant.
WHAT IS INSIDE
- Real-time caffeine gauge with rising indicator
- 24-hour rolling caffeine curve with bedtime marker
- Sleep-impact projection at your set bedtime
- Cortisol-based optimal coffee window
- 10 drink types: espresso, big coffee, green tea, matcha, black tea, mate, energy drink, Coca-Cola, chocolate, decaf
- What-if simulation for combined doses
- Apple Health sync (caffeine intake)
- Edit history, adjust bedtime, fine-tune your half-life
CAFEIN PRO unlocks unlimited logging, unlimited simulations, and CSV export for AI assistants and your own analysis.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Logging feels alive , the save check draws itself on, with a little haptic tap
• Made a mistake? An Undo appears right after you log, and when you swipe in History
• Swipe any history row to delete it
• Charts, the sleep-streak grid, and the gauge now animate in as they load
• Bedtime at a glance: a compact sleep pill that taps open to the full dial
• Smoother launch , no more icon flash before the intro
The developer, Theorics Limited, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Theorics Limited
- Size
- 48.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Cafein Pro $24.99
- Copyright
- © 2026 cafein