HALFLIFE: Quit Caffeine
Taper & Withdrawal Tracker
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
You tried to quit caffeine cold turkey. By day two, the headache was unbearable, you couldn't focus at work, and you caved. You're not weak -- you're experiencing a medically recognized withdrawal syndrome (DSM-5 code 292.0). And the cold-turkey approach is the reason 80% of people fail.
HALFLIFE is the first app that treats caffeine like what it is: a psychoactive drug with a 5-6 hour half-life, predictable withdrawal symptoms, and a clinically recommended tapering protocol. You don't quit caffeine -- you taper off it.
HOW IT WORKS
Tell the app what you drink -- coffee, energy drinks, tea, soda, pre-workout, even chocolate. HALFLIFE calculates your true daily caffeine intake (most people underestimate by 40-60%) and builds a personalized taper plan that reduces your consumption by 10-25% per week.
Each day you get a caffeine budget -- not a prohibition, but a shrinking allowance. You choose how to spend it. One smaller coffee? Switch to half-caf? Green tea instead of espresso? The budget decreases on schedule until you reach your goal.
PREDICT WITHDRAWAL BEFORE IT HITS
HALFLIFE maps your expected symptoms to a medical timeline: when headaches will peak, when fatigue resolves, when brain fog clears. "Day 3: Expect moderate headache. Peak intensity: tomorrow. Resolution: day 7." The unknown becomes known. Fear becomes a plan.
SEE WHAT CAFFEINE DOES TO YOUR SLEEP
Your 3pm coffee means 47mg of caffeine is still in your bloodstream at midnight. Your "afternoon pick-me-up" is costing you deep sleep every single night. HALFLIFE's real-time pharmacokinetic timer shows exactly how much caffeine remains in your system at any moment -- based on published half-life research (5.7-hour average metabolism). Once you see the numbers, you can't unsee them.
BUILT ON SCIENCE, NOT WILLPOWER
- Personalized taper schedule based on your actual intake
- 50+ drinks and caffeine sources with accurate mg data
- Daily caffeine budget that decreases on a medical schedule
- Withdrawal symptom predictor mapped to clinical timelines
- Real-time half-life decay calculator
- Caffeine-sleep impact visualizer
- Symptom logging to track predicted vs. actual experience
- Substitution suggestions for every reduction step
Caffeine withdrawal is recognized by the DSM-5, and gradual tapering is recommended by the Cleveland Clinic, Mayo Clinic, and the American Academy of Sleep Medicine. HALFLIFE applies this clinical protocol to your specific intake -- so you can quit without the suffering that made you restart last time.
The people who beat caffeine don't white-knuckle it. They follow a protocol. This is yours.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
A quieter, smoother HALFLIFE — with performance improvements throughout.
The developer, Torben Nils Seidler, 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- 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
- Seller
- Torben Nils Seidler
- Size
- 28.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 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
- Weekly $8.99
- Lifetime Access $149.99
- 3 Months Pro $24.99
- Annual $79.99
- Copyright
- © 2026 Torben Nils Seidler