# HALFLIFE: Quit Caffeine — Taper & Withdrawal Tracker

> Personalized caffeine tapering and withdrawal symptom tracker based on scientific protocols. (iPhone/iPad app by Torben Nils Seidler.)

- Source: https://appshunter.io/ios/app/halflife-quit-caffeine/id6761648347 (this page in markdown: same URL + `.md`)
- Developer: [Torben Nils Seidler](https://appshunter.io/developer/1834241692)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 27 MB
- Languages: English
- Released: 2026-04-21
- Data updated: 2026-06-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/halflife-quit-caffeine/id6761648347/reviews.md

## What is HALFLIFE?

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/

## Key features

- Personalized taper schedule
- Daily caffeine budget
- Withdrawal symptom predictor
- Real-time half-life calculator
- Caffeine-sleep impact visualizer
- Symptom logging
- Substitution suggestions

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly | $8.99 | per 7 days |
| Annual | $79.99 | per year |
| 3 Months Pro | $24.99 | per 3 months |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Access | $149.99 | one-time |



## Frequently asked questions about HALFLIFE

### Does HALFLIFE have ads?

Yes, HALFLIFE contains advertisements to support its development and free features. You can remove ads and unlock premium features through in-app purchases.

### How does HALFLIFE calculate my caffeine intake?

HALFLIFE uses a database of over 50 drinks and caffeine sources with accurate milligram data. It calculates your true daily intake, as many users underestimate their consumption by 40-60%.

### What is the recommended tapering schedule in HALFLIFE?

HALFLIFE builds a personalized taper plan that reduces your consumption by 10-25% per week, based on clinical recommendations from institutions like the Cleveland Clinic and Mayo Clinic.

### Can HALFLIFE predict my withdrawal symptoms?

Yes, HALFLIFE maps expected withdrawal symptoms to a medical timeline, predicting when headaches will peak, fatigue will resolve, and brain fog will clear, helping you prepare.

### How does HALFLIFE show the impact of caffeine on sleep?

The app features a real-time pharmacokinetic timer that shows how much caffeine remains in your system at any moment, illustrating how late-day consumption affects your deep sleep.

### What are the subscription options for HALFLIFE Pro?

HALFLIFE offers several subscription plans: Weekly at $8.99/P7D, 3 Months Pro at $24.99/P3M, and Annual at $79.99/P1Y, providing access to premium features.

### Is HALFLIFE suitable for all ages?

HALFLIFE is rated for ages 4 and up, making it accessible for a wide range of users interested in managing their caffeine intake.

### How often is HALFLIFE updated?

The app was last updated on May 20, 2026, with its latest version being 1.0.5, indicating regular maintenance and potential feature additions.

## Version history (last 3 releases)

### 1.0.5 — 2026-05-20

A quieter, smoother HALFLIFE — with performance improvements throughout.

### 1.0.4 — 2026-05-14

Fixed a potential app crash upon opening notifications.

### 1.0 — 2026-04-21

No release notes.

## More apps by Torben Nils Seidler

- [MyNailHealth](https://appshunter.io/ios/app/mynailhealth/id6751249794)
- [GhostFits - AI Wardrobe](https://appshunter.io/ios/app/ghostfits-ai-wardrobe/id6757407350)
- [COMPOUND: Peptide Calculator](https://appshunter.io/ios/app/compound-peptide-calculator/id6762041256)

All apps by Torben Nils Seidler: https://appshunter.io/developer/1834241692

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-26.*