Comparison

Caffeine Flow vs cafein

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Caffeine Flow

Features
Read full description

Caffeine Flow is an intelligent caffeine management app that tracks your body's caffeine levels in real time using half-life pharmacokinetics and guides you to the optimal bedtime for uninterrupted sleep. Log your daily caffeine intake from coffee, energy drinks, tea, and soda with ease, and visualize how caffeine flows through your body throughout the day. - Key Features - Science-Based Caffeine Tracking Using the caffeine half-life formula (C = C0 x 0.5^(t/h)), Caffeine Flow precisely calculates your current body caffeine level. Instead of simply tallying intake, it shows how your actual body concentration changes over time with intuitive visual graphs. Sleep Safe Time & Risk Warnings By combining your bedtime settings and caffeine sensitivity profile, the app pinpoints exactly when you should stop consuming caffeine and when it is safe to fall asleep. If you exceed your daily limit or sleep risk thresholds, intuitive warning chips appear directly on the home screen. Personalized Caffeine Profile A quick sensitivity quiz analyzes your metabolism type (Elephant, Human, or Rabbit). Factoring in your weight and special conditions such as pregnancy or adolescence, it automatically calculates your personalized daily caffeine limit. Expanded Asian & Global Drink Database Preloaded with data from major franchises and global brands across Asia (Korea, Japan, Vietnam, China, etc.). We now support official brand-specific cup sizes (e.g., Tall, Venti), making it easier and more accurate than ever to log your exact drink. Intuitive Dashboard View today's total intake, current body level, remaining daily allowance, and sleep safe time all on one screen. A 24-hour caffeine concentration curve lets you predict your caffeine trajectory ahead of time. Weekly/Monthly Deep Insights Go beyond simple charts. Our new Deep Insights feature analyzes your sleep interference index, recommended cutoff times, dependency trends, and unusual intake patterns. Get comprehensive weekly and monthly reports on how your caffeine habits affect your sleep. Home Screen Widgets Check your current caffeine level and estimated sleep readiness time directly from your home screen without opening the app. Smart Notifications Receive proactive alerts when your projected bedtime caffeine level may disrupt sleep. Get immediate notifications when you exceed your daily limit. Secure Data Management All records are stored securely on your device. Backup and restore functionality ensures safe data transfer when switching devices. 9 Premium Themes Choose from 9 aesthetic themes including Warm Beige, Midnight Slate, and Neon Cyber. Customize the app atmosphere to match your personal style. Korean and English Supported Full localization in both Korean and English. Start your science-backed energy management with Caffeine Flow. Brew, Track, Sleep well.

About

cafein

Features
Read full description

This app helps you use coffee as fuel and prevent it from costing you sleep. Tap one button to log an espresso, matcha, energy drink, or even a Coca-Cola. A real bi-exponential pharmacokinetics model projects how much caffeine you'll likely still have in your bloodstream when you want to be asleep. WORK WITH YOUR NATURAL CORTISOL Cafein shows your cortisol awakening response, the natural alertness curve that peaks in the first hour after waking. Drinking coffee inside that window can blunt how strongly caffeine hits. Cafein highlights the window where your first cup tends to land hardest (typically 1.5 to 3.5 hours after wake). SIMULATE BEFORE YOU SIP Thinking about a 4 pm espresso? Cafein lets you test combinations without committing. See how that hypothetical second coffee changes your bedtime number, then decide. BUILD YOUR HEALTH STORY Every cup syncs to Apple Health. Your data is yours, exportable as CSV any time, ready to share with your doctor or AI assistant. WHAT IS INSIDE - Real-time caffeine gauge with rising indicator - 24-hour rolling caffeine curve with bedtime marker - Sleep-impact projection at your set bedtime - Cortisol-based optimal coffee window - 10 drink types: espresso, big coffee, green tea, matcha, black tea, mate, energy drink, Coca-Cola, chocolate, decaf - What-if simulation for combined doses - Apple Health sync (caffeine intake) - Edit history, adjust bedtime, fine-tune your half-life CAFEIN PRO unlocks unlimited logging, unlimited simulations, and CSV export for AI assistants and your own analysis. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Caffeine Flow4 screens
cafein4 screens

Verdict

The call

The clearest difference is in-app purchases: Caffeine Flow at none against cafein's 1. cafein's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. cafein sells 1 in-app purchase, starting at $24.99 per year. Caffeine Flow asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.

Scorecard2 real differences Β· 4 level
Caffeine Flow versus cafein: the parameters behind the verdict, then further details
ParameterCaffeine Flowcafein
PriceFreeFree
Update frequencyFortnightlyFortnightly
AdsYesNo β€” better
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPad, iPod β€” better
Requires iOS15.0 β€” better15.1
Further details β€” not scored
Size86 MB46 MB
Age rating4+4+
DeveloperChinipyTheorics Limited

In-app purchases

None

Caffeine Flow

No in-app purchases

1 purchases

cafein

Subscriptions1
  • Cafein Pro$24.991 Year

Questions

Is Caffeine Flow free?
Caffeine Flow is free to download, with no in-app purchases.
Is cafein free?
cafein is free to download, with in-app purchases available.
Do Caffeine Flow or cafein have ads?
Caffeine Flow shows ads; cafein does not.
Which is updated more often, Caffeine Flow or cafein?
Caffeine Flow ships an update fortnightly, and cafein fortnightly. Most recently, Caffeine Flow was updated on September 25, 2026 and cafein on October 8, 2026.

Other comparisons