# CaffeineHalf: Caffeine Tracker — Know your caffeine at bedtime

> Know your caffeine at bedtime (iPhone/iPad app by Takumi Sekiguchi.)

- Source: https://appshunter.io/ios/app/caffeinehalf-caffeine-tracker/id6790299282 (this page in markdown: same URL + `.md`)
- Developer: [Takumi Sekiguchi](https://appshunter.io/developer/1896725776)
- Category: Food & Drink
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 6 MB
- Languages: American English, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China) and 5 more
- Released: 2026-07-14
- Data updated: 2026-08-16
- User reviews in markdown: https://appshunter.io/ios/app/caffeinehalf-caffeine-tracker/id6790299282/reviews.md

## What is CaffeineHalf?

Track your caffeine intake and see exactly how much will remain in your system at bedtime — based on the pharmacokinetic half-life model (approximately 5-6 hours).

Features:
- Auto-calculate caffeine from drink type
- Half-life based residual caffeine prediction
- Set bedtime for countdown estimation
- Time-decay graph visualization
- Custom drink registration
- Daily intake history

Great for:
- People sensitive to caffeine's sleep effects
- Anyone improving their sleep quality
- Optimizing caffeine timing for productivity
- Managing intake during pregnancy or nursing

Based on pharmacokinetic half-life modeling — goes beyond simple intake counters to predict actual residual caffeine levels.

Your caffeine records stay on your device.

FREE VERSION AND FULL ACCESS
The free version displays banner ads. A one-time Full Access purchase unlocks every feature and removes ads. Customers who previously bought the paid app also continue without ads.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Access | $1.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-08-15

Added a freemium option with ads in the free version. Paid pricing remains unchanged.

### 1.0.1 — 2026-07-24

Improved app stability and minor refinements.

### 1.0 — 2026-07-15

No release notes.

## More apps by Takumi Sekiguchi

- [PinTimer: Quick Timers](https://appshunter.io/ios/app/pintimer-quick-timers/id6770227102)
- [NumberDash: Math Runner](https://appshunter.io/ios/app/numberdash-math-runner/id6779497857)
- [CarePill — Medication Tracker](https://appshunter.io/ios/app/carepill-medication-tracker/id6782528630)
- [VoiceMemo: Record & Organize](https://appshunter.io/ios/app/voicememo-record-and-organize/id6790124396)
- [CardCalc: Track Card Spending](https://appshunter.io/ios/app/cardcalc-track-card-spending/id6790125861)
- [WarrantyBox: Warranty Tracker](https://appshunter.io/ios/app/warrantybox-warranty-tracker/id6790126059)

All apps by Takumi Sekiguchi: https://appshunter.io/developer/1896725776

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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 2026-08-16.*