# Caffeine Half Life — Track intake & sleep timing

> Track intake & sleep timing (iPhone/iPad app by Adrian Nowak.)

- Source: https://appshunter.io/ios/app/caffeine-half-life/id6761268609 (this page in markdown: same URL + `.md`)
- Developer: [Adrian Nowak](https://appshunter.io/developer/1888522412)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 26.0 · 13 MB
- Languages: American English
- Released: 2026-04-01
- Data updated: 2026-06-27
- User reviews in markdown: https://appshunter.io/ios/app/caffeine-half-life/id6761268609/reviews.md

## What is Caffeine Half Life?

Caffeine Half Life helps you estimate how caffeine leaves your system over time — so you can make more informed choices about sleep and energy.

Highlights
- Personalized elimination curve using your profile (e.g. smoking, pregnancy, oral contraceptives) when you choose to provide them
- Sleep-readiness estimates based on your bedtime and caffeine threshold — approximate only
- Apple Health: optional read/write for dietary caffeine, plus HRV correlation on the chart so you can spot patterns (you control permissions)
- Widgets and Apple Watch complications for quick glances — including a trend graph complication
- Interactive chart — drag to inspect caffeine levels and HRV at any time of day

How it works
The app uses a simplified pharmacokinetic model (Bateman equation) to estimate caffeine absorption and elimination based on your personalized half-life. Factors like age, BMI, activity level, smoking, pregnancy, and oral contraceptives adjust the half-life up or down from the ~5-hour population average.
Important: This app is for general wellness and educational purposes. It is not medical advice and not a medical device. All estimates are approximate — individual metabolism varies. Consult a healthcare professional for health decisions.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium | $1.99 | per month |



## Version history (last 2 releases)

### 1.1 — 2026-04-06

- Bugfixes and performance improvements.

### 1.0 — 2026-04-01

No release notes.

## Related topics

[caffeine half life](https://appshunter.io/ios/topics/caffeine-half-life)

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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 2026-06-27.*