# Caffeine Curfew: Sleep Coach — Caffeine Tracker for Sleep

> Caffeine tracker that models half-life decay for optimized sleep. (iPhone/iPad app by GARRETT MICHAEL WOODSIDE.)

- Source: https://appshunter.io/ios/app/caffeine-curfew-sleep-coach/id6757022559 (this page in markdown: same URL + `.md`)
- Developer: [GARRETT MICHAEL WOODSIDE](https://appshunter.io/developer/1853175827)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.64/5 from 14 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 8 MB
- Languages: English
- Released: 2026-01-07
- Data updated: 2026-06-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/caffeine-curfew-sleep-coach/id6757022559/reviews.md

## What is Caffeine Curfew?

Stop guessing if it’s too late for coffee. Know the answer.

Most trackers just count cups. Caffeine Curfew models the biological half-life of every milligram you drink to predict exactly when your body will be ready for sleep.

Caffeine doesn’t disappear when you finish your drink. It decays slowly over 5–8 hours. A 4 PM espresso can leave you chemically awake at midnight. Caffeine Curfew reveals this hidden "active caffeine" level so you can protect your sleep quality, avoid insomnia, and wake up rested.

MEET LEO: YOUR AI SLEEP STRATEGIST

Powered by Apple Intelligence (on supported devices), Leo is your witty, data driven sleep coach. He doesn't just show you numbers; he gives you the brutal truth about your habits. 
• "You're over budget." 
• "One more espresso will ruin your deep sleep." 
• "You're clear for takeoff." Leo analyzes your intake against your custom bedtime to give you a personalized "Safe" or "Critical" status instantly.

SCIENCE BACKED FEATURES

• Real-Time Half-Life Decay: Watch your active caffeine levels drop in real time. • Sleep Risk Analysis: Know your projected bedtime status before you take that first sip. • Custom Physiology: Adjust your personal metabolism rate (half-life) and sensitivity threshold. • Smart Pre Sets: Log generic drinks or scan barcodes with a tap.

BUILT FOR THE APPLE ECOSYSTEM

• Live Activities & Widgets: Monitor your decay right from your Lock Screen or Dynamic Island.
 • Apple Watch App: Log drinks and check your "Active Mg" from your wrist. 
• Siri & Shortcuts: "Hey Siri, log an espresso." 
• Apple Health Sync: Seamlessly reads your sleep data to fine tune your nightly curfew.

WHY CAFFEINE CURFEW?

Whether you are an athlete optimizing recovery, a student pulling all nighters, or just someone tired of staring at the ceiling, clarity is the cure. This isn’t just a timer; it’s a biological fuel gauge for your brain.

Download Caffeine Curfew and master your energy today.


Privacy Policy: https://garrettmichae1.github.io/CaffeineCurfew/

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

Data Sources: This app uses food product data from Open Food Facts, available under the Open Database License (ODbL). Source: https://world.openfoodfacts.org License: https://opendatacommons.org/licenses/odbl/1-0/

## Key features

- Real-time half-life decay tracking
- AI sleep strategist (Leo)
- Sleep risk analysis
- Customizable physiology settings
- Smart drink presets and barcode scanning
- Live Activities and Widgets
- Apple Watch app integration

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Yearly | $9.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Lifetime | $19.99 | one-time |
| Support the Vision! | $14.99 | one-time |
| Buy the developer a coffee! | $4.99 | one-time |
| Buy the developer lunch! | $8.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/caffeine-curfew-sleep-coach/id6757022559/reviews.md

### 1/5 — Broken update

*2026-06-08*

Was completely unusable due to lag after the update with location checks. Had to delete and reinstall, and the app lost my data even though Apple Health still has it.

**Developer response:** Sorry about the experience. The app shouldn’t become unusable after the location update. Reinstalling the app currently removes locally stored data, but I understand how frustrating that is, especially when the information still exists in Apple Health. I’m looking into any potential performance issue and ways to better restore data from HealthKit in future updates. Thanks for the feedback. If you reach out via the support email, I can assist you further.

### 5/5 — Pretty Slick!

*2026-04-08*

Cool little app. I use it to regularly track caffeine intake daily as having coffee at the wrong time severely messes with my sleep. Mental illness makes this more of a problem for me than most, so it’s been a real godsend to be able to reliably know when I should quit drinking caffeine for the day. Big thanks to the dev ☺️

**Developer response:** Big thank you to you! Cheers!

### 5/5 — Review

*2026-04-08*

I’m a caffeine addict. This app truly helps me keep track of it and not go overboard!

**Developer response:** Let’s go! ☕️ Glad to hear it.

### 5/5 — Nice app, responsive Dev

*2026-03-21*

The Dev was very responsive i came across the app inside of Reddit. The dev very kind and took the time to help me with my individual questions regarding fast metabolization of caffeine and how to tweak the app to get a better result on your own individual profile. This is definitely one of those apps that you keep on your phone, let it run in the background, it will remind you to track your caffeine intake, while Providing some tips and tricks you can use to lower the amount of circulating caffeine in your body. It’s really great for those who want to bio hack their sleep.

**Developer response:** Thank you so much for the wonderful five star review! It was an absolute pleasure chatting with you on Reddit and helping you get the settings perfectly dialed in for your fast metabolization profile.
Hearing that the app has become a daily tool for you to track your caffeine intake and biohack your sleep is exactly why I built it. I really appreciate your support and your incredibly kind words. Please feel free to reach out anytime if you have more questions or ideas!

### 5/5 — Amazing job, with a couple suggestions.

*2026-02-04*

I want to start by praising you for creating a beautifully designed app. The UI is genuinely pleasant to look at, and the UX is straightforward, intuitive, and easy to navigate. Everything feels thoughtfully laid out, which makes the app enjoyable to use.

I will be upfront in saying that I do not fully understand the physiology behind how the human body metabolizes caffeine, including factors like timing, dosage, sex, weight, height, and other variables. I am hoping that you do, and the app certainly gives that impression. However, as a user, I currently have no way to understand or verify how these calculations are being made.

It would be extremely helpful to have some kind of learning or education section that explains how caffeine metabolism works in general, as well as how your algorithm determines the statistics it displays. This could also tie directly into the settings area, especially sections like Personal Physiology, Sleep Interference Threshold, and Daily Goals, by helping users understand what those options mean and how adjusting them affects outcomes.

It may be best to assume that most users do not have a strong background in this topic. One idea could be a short onboarding questionnaire that users fill out, allowing the app to automatically configure these settings based on relevant physiological variables. This would reduce confusion and increase confidence in the accuracy of the results.

Down the road, it could also be valuable to have the underlying calculations reviewed by an independent third party and to make the results of that review transparent to users. Even a high-level validation would go a long way in building trust and credibility around the algorithm.

Overall, you are off to a wonderful start. I strongly encourage you to continue your great work. I can easily see this app becoming genuinely useful to a wide range of people.

**Developer response:** Thank you so much for the incredibly thoughtful review and the five star rating! I am absolutely thrilled to hear that you are loving the design and finding the app so easy to navigate.
You have brought up some truly fantastic ideas regarding transparency and education. I completely agree that adding a learning section to explain caffeine metabolism and how the app calculates your personal statistics would be a huge benefit. Tying those explanations directly into the settings and adding an onboarding questionnaire are brilliant suggestions that would definitely help users feel more confident in their results.
Building trust is incredibly important to me, and having the calculations reviewed in the future is a wonderful goal to strive for. Thank you again for taking the time to share such detailed and constructive feedback. It is users like you who will help make this app the best it can possibly be!

### 5/5 — A must for coffee addiction

*2026-01-13*

Love this app, now I can track my coffee intake and bot being worried about ruining my sleep! Love the Apple watch extension!

**Developer response:** So glad it’s helping you find that balance! We really focused on making the Watch extension snappy so you could log and get back to your day, so it’s awesome to hear you’re getting use out of it. Sleep is everything, thanks for the support!

### 4/5 — Insightful information

*2026-01-08*

The app has provided insightful information about caffeine consumption and how it can impact your sleep.

**Developer response:** Thanks for the feedback! Knowledge is half the battle when it comes to better sleep. If there are any other specific caffeine insights or data points you’d love to see in the future, definitely let us know.

## Frequently asked questions about Caffeine Curfew

### How does Caffeine Curfew calculate active caffeine?

Caffeine Curfew models the biological half-life of caffeine, predicting how long it takes for your body to process it. It shows your 'active caffeine' level in real-time, decaying over 5-8 hours after consumption.

### What is Leo in Caffeine Curfew?

Leo is an AI sleep strategist powered by Apple Intelligence on supported devices. It analyzes your caffeine intake against your custom bedtime to provide personalized 'Safe' or 'Critical' status updates.

### Can I customize Caffeine Curfew to my body?

Yes, Caffeine Curfew allows you to adjust your personal metabolism rate (half-life) and sensitivity threshold. This helps tailor the predictions to your unique physiology.

### Does Caffeine Curfew sync with Apple Health?

Yes, Caffeine Curfew seamlessly syncs with Apple Health. It reads your sleep data to fine-tune your nightly curfew predictions for better accuracy.

### Is Caffeine Curfew available on Apple Watch?

Yes, Caffeine Curfew has an Apple Watch app. You can log drinks and check your 'Active Mg' directly from your wrist.

### What are the subscription options for Caffeine Curfew?

Caffeine Curfew offers a Pro Monthly subscription plan for $0.99 per month. This likely unlocks additional features or removes limitations beyond the free version.

### How often is Caffeine Curfew updated?

The app was last updated on March 20, 2026, indicating regular development and support. The latest version is 1.6.

### What is the age rating for Caffeine Curfew?

Caffeine Curfew has an age rating of 4+. This suggests it is suitable for a wide audience, including children, with no mature content.

## Version history (last 5 releases)

### 1.9 — 2026-06-11

What’s New in Version 1.9

- New and improved Sleep Calendar
- Smoother, faster Sleep Score experience  
- More responsive physiology controls  
- Improved scrolling and overall performance  
- Enhanced stability across iPhone, Apple Watch, and widgets  
- General refinements and bug fixes

### 1.7 — 2026-05-29

Version 1.7 is a major upgrade for sleep focused caffeine tracking.

What’s new:

• New Sleep Impact Analysis with Apple Health sleep data  
• New Curfew Window and Sleep Guard iPhone widgets  
• New Apple Watch Smart Stack widgets and complications  
• New Caffeine Database with curated drinks 
• Redesigned Caffeine Calendar with cleaner daily summaries  
• Updated Metabolism 101 with a more personal, educational layout  
• Smarter Leo Sleep Coach insights using your current caffeine, limits, and bedtime  
• Improved onboarding, notifications, haptics, and overall app polish  

Thank you for using Caffeine Curfew and helping shape the app.

### 1.6 — 2026-03-20

What’s New in This Version:

- New Apple Watch experience with a cleaner monitor view and smoother visuals.

- New Daily Streak widget (Pro) to keep your momentum visible at a glance.

-12 Month Insight redesigned with swipeable month to month calendar views.

-Metabolism 101 fully revamped with a cleaner, more premium card based flow.

-Home Screen Monitoring refreshed with upgraded widget previews.

-Reliability improvements across iPhone, Apple Watch, and Widgets, plus connection state bug fixes and overall UI polish.

### 1.5 — 2026-01-30

This update is all about streamlining your experience. 

• Focused Tracking: We have removed the water logging feature to simplify the interface and dedicate the app entirely to advanced caffeine decay modeling. 

• Tip Jar: Enjoying the app? We’ve added a way to support ongoing development directly in the Settings menu.

Thanks for tracking with us!

### 1.4 — 2026-01-26

The Scanner is Here: Quickly log drinks by scanning barcodes. Powered by Open Food Facts, logging your favorite energy drinks or coffees is now effortless.

Meet the New Leo: We’ve integrated Apple Intelligence to make Leo, your sleep coach, even more context aware. If you’re on a compatible device, Leo now provides smarter, more personalized feedback.

"Hey Siri, Feed Leo": Hands free logging is live. Just tell Siri to log a drink or ask for your current caffeine status.

Rock Solid Hydration: We’ve overhauled the water logging system to eliminate history edge cases. Your data is now more reliable than ever.

Dynamic UX: New "Share Status" feature and UI upgrades make managing your caffeine levels a smoother, more social experience.

## More apps by GARRETT MICHAEL WOODSIDE

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- [HydroFoo: Water Tracker](https://appshunter.io/ios/app/hydrofoo-water-tracker/id6760419525)
- [Imagine: Coloring for Kids](https://appshunter.io/ios/app/imagine-coloring-for-kids/id6762320485)
- [Imagine: Word Search AI](https://appshunter.io/ios/app/imagine-word-search-ai/id6765814324)

All apps by GARRETT MICHAEL WOODSIDE: https://appshunter.io/developer/1853175827

## Related topics

[caffeine curfew](https://appshunter.io/ios/topics/caffeine-curfew) · [garrett michael woodside](https://appshunter.io/ios/topics/garrett-michael-woodside) · [caffeine half life](https://appshunter.io/ios/topics/caffeine-half-life) · [garrett michael](https://appshunter.io/ios/topics/garrett-michael) · [caffeine sleep](https://appshunter.io/ios/topics/caffeine-sleep)

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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 2026-06-29.*