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Halvo: Caffeine & Sleep
Track caffeine, protect sleep
Free · In‑App Purchases
Halvo helps you enjoy your coffee AND protect your sleep.
Most caffeine apps just count milligrams. Halvo models the caffeine actually active in your body — using real pharmacology, not a rule of thumb — then predicts your level at bedtime and tells you your personal cut-off: the time after which the next cup starts costing you sleep.
LOG IN SECONDS
Add coffee, espresso, tea, energy drinks, soda, mate or your own pre-workout in a few taps. Halvo sums up the caffeine automatically and shows how much is still active right now.
SEE YOUR CURVE
Watch caffeine rise, peak and fade on a real concentration curve modeled with Bateman kinetics — and see exactly where you'll land when your head hits the pillow.
YOUR PERSONAL CUT-OFF
Everyone clears caffeine at a different speed. Halvo shows the latest you can have a cup without too much caffeine still active when you fall asleep.
ON YOUR WRIST
Halvo runs on Apple Watch too, with a complication for a glance-and-go check.
A MODEL THAT LEARNS YOU — HONESTLY (PRO)
With your permission, Halvo reads your sleep, heart rate and HRV from Apple Health to learn your personal caffeine half-life over time. Here's what makes it different: when the signal in your data is too weak to be sure, Halvo says so and uses the population value — instead of faking precision it doesn't have.
WORKS WITH YOUR WEARABLES (PRO)
Apple Watch, Oura, Whoop, Garmin — anything that syncs sleep and heart data to Apple Health. Halvo never connects to those services directly; it only reads what's already in Apple Health.
PRIVATE BY DESIGN
Your intake and health data are processed on your device. Halvo doesn't sell your data.
FREE & PRO
Halvo is free to track caffeine and find your cut-off. Halvo Pro adds the personal learning model, sleep insights and Bateman kinetics.
Halvo Pro options:
- Monthly — $3.99
- Yearly — $24.99 (with a 2-week free trial)
- Lifetime — $34.99 one-time (no subscription)
Payment is charged to your Apple Account. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. Lifetime is a one-time purchase. Prices may vary by region.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://halvo.jnmcloud.de/privacy.html
Halvo is not a medical device and does not diagnose, treat or prevent any condition. It helps you make more informed choices about caffeine.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Clearer night analysis: the caffeine signature now appears in gradual steps and is labeled more honestly — with no caffeine tracked, we no longer claim a caffeine signal. Plus a larger, more reliable add button and an onboarding layout fix.
The developer, Jan Niklas Molleken, 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 Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Jan Niklas Molleken
- Size
- 7.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Languages
- English and German
- Age Rating
13+
- 13+
- Infrequent
Alcohol, Tobacco, Drug Use or References
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Halvo Pro Lifetime $29.99
- Halvo Pro – Monthly $3.99
- Copyright
- © 2026 Jan Mölleken