# HalfCaff — Real-Time Body Caffeine Level

> Real-Time Body Caffeine Level (iPhone/iPad app by Yutaro Koide.)

- Source: https://appshunter.io/ios/app/halfcaff/id6760937590 (this page in markdown: same URL + `.md`)
- Developer: [Yutaro Koide](https://appshunter.io/developer/1880033436)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-03-28
- Data updated: 2026-07-04
- User reviews in markdown: https://appshunter.io/ios/app/halfcaff/id6760937590/reviews.md

## What is HalfCaff?

HalfCaff tracks your caffeine intake and shows exactly how much caffeine is in your body right now.

Using scientifically-based half-life calculations, HalfCaff answers the one question every coffee lover asks: "Can I have another cup and still sleep tonight?"

"○○mg remaining" — Based on your bedtime threshold and the FDA daily limit (400mg), see exactly how much more you can drink at a glance.

Features:
- Real-time body caffeine level with circular gauge
- Remaining allowance display ("○○mg OK to drink")
- 24-hour caffeine decay curve
- 70+ drink presets (Starbucks, Doutor, Tully's official data)
- Home screen widgets (Small & Medium)
- Dynamic Island & Live Activities
- Personalized half-life based on your caffeine sensitivity

HalfCaff Pro unlocks:
- Home screen widgets
- Dynamic Island display
- Unlimited history

Includes a 3-day free trial.

Terms: https://halfcaff.decoy284.net/terms/
Privacy Policy: https://halfcaff.decoy284.net/privacy/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Yearly | $22.99 | per year |
| Monthly | $5.99 | per month |



## Version history (last 3 releases)

### 1.1.1 — 2026-04-08

- Improved App Store metadata for better discoverability

### 1.1.0 — 2026-03-29

- Added full English localization
- All UI, drink presets, widgets, and Dynamic Island now display in English

### 1.0.0 — 2026-03-28

No release notes.

## More apps by Yutaro Koide

- [Pocktools 便利ツール18個入り](https://appshunter.io/ios/app/pocktools-18/id6759652599)
- [BodyNote: Body Meas Track](https://appshunter.io/ios/app/bodynote-body-meas-track/id6760719929)

All apps by Yutaro Koide: https://appshunter.io/developer/1880033436

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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 2026-07-04.*