# Quit Caffeine: Decaf Tracker — Caffeine curve & sleep guard

> Caffeine curve & sleep guard (iPhone/iPad app by SEONYONG LEE.)

- Source: https://appshunter.io/ios/app/quit-caffeine-decaf-tracker/id6791872281 (this page in markdown: same URL + `.md`)
- Developer: [SEONYONG LEE](https://appshunter.io/developer/6775892940)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 98 MB
- Languages: American English, Korean
- Released: 2026-07-23
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/quit-caffeine-decaf-tracker/id6791872281/reviews.md

## What is Quit Caffeine?

Quit Caffeine shows what coffee is actually doing to you — right now.

■ Your body's caffeine curve
Log a drink with one tap and watch your body's caffeine level decay in real time on a live half-life chart. See exactly how much is still in your system at bedtime.

■ Sleep guard
Set your bedtime and a sleep threshold. The app tells you the latest time for your last coffee — and warns you when one more cup would wreck tonight's sleep.

■ Taper or quit — your choice
Reduce week by week with a gentle taper plan, or go caffeine-zero and count your streak. Both modes track your progress.

■ Caffeine withdrawal timeline
Know what commonly happens after cutting back — headache peak around days 1–2, energy dips, then steadier sleep and focus within weeks. General, science-informed info with milestone reminders. (Not medical advice.)

■ Built-in drink database
Espresso, drip, cold brew, teas, energy drinks, cola — realistic caffeine amounts per size, plus custom entries.

■ Private by design
No account. No cloud. Everything stays on your device.

One-time purchase removes all ads permanently.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-08-08

Improved the ad system for better stability and performance.

### 1.0.0 — 2026-07-23

No release notes.

## More apps by SEONYONG LEE

- [Daily Bible: Verse & Prayer](https://appshunter.io/ios/app/daily-bible-verse-and-prayer/id6775892937)
- [Pilmori - Film Camera](https://appshunter.io/ios/app/pilmori-film-camera/id6776468544)
- [Lumen · Daily Bible](https://appshunter.io/ios/app/lumen-daily-bible/id6780531841)
- [ClickTimer - Ticketing Timer](https://appshunter.io/ios/app/clicktimer-ticketing-timer/id6782375382)
- [Nyangle](https://appshunter.io/ios/app/nyangle/id6784073693)
- [Vidpress: Video Compressor](https://appshunter.io/ios/app/vidpress-video-compressor/id6787706840)

All apps by SEONYONG LEE: https://appshunter.io/developer/6775892940

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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 2026-08-14.*