Comparison

Caffie vs Caffeine mg

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

Head to head
About

Caffie

Features
Read full description

Make caffeine your ally for peak performance and deep sleep. An intuitive tracker app that accurately simulates your "current caffeine levels" and exactly "when it will clear" from your system. Coffee and energy drinks are amazing tools for boosting focus, but consuming them at the wrong time or in the wrong amounts can severely degrade your sleep quality at night. With Caffie, you can see at a glance when caffeine will leave your body, allowing you to plan the perfect time to relax. [Core Features] • Real-Time Level Display: Visualize your naturally decreasing caffeine levels over time with an intuitive graph. • Smart Insights: Receive precise advice based on your current levels, such as "Optimal alertness" or "Avoid further intake." • Clearance Prediction: Automatically calculates the time until your caffeine level "down to adequate level" and "reaches near zero." • Simple Logging: Intuitively log your drinks with a single tap. [Caffine Pro (Premium Features)] Unlock all features permanently for the price of a single cup of coffee. • Home Screen Widget: Check your current caffeine levels anytime without opening the app. • All-Time History Data: Look back at all your past records and analyze your caffeine habits. • Unlimited Custom List: Add your frequently consumed drinks without any limits. *Disclaimer The calculations for half-life and remaining body levels provided by this app are estimates based on general scientific data. They are not intended to provide medical advice. Please consult a medical professional for accurate judgments regarding your health. Caffine is a smart tracker that visualizes your remaining caffeine levels in real time and supports optimal caffeine control. Since you can also check your daily caffeine intake history, you can thoroughly manage your caffeine with just this one app.

About

Caffeine mg

Features
Read full description

Caffeine mg is a one-tap caffeine tracker that visualises remaining body caffeine and the time it drops below a sleep-friendly threshold using a half-life decay model. "Can I have one more coffee this afternoon and still sleep tonight?" — that's the question this app answers. ■ Who it's for - Daily coffee or energy drink consumers - People whose afternoon caffeine affects sleep - Users who prefer no ads and one-time purchases - Login-free tracking with caffeine records stored on device ■ Main features - 50+ preset drinks (coffee, energy drinks, tea, etc.) - Custom drinks with caffeine content and serving size - Tap to log "now", long press to set the time - Today's total intake and remaining allowance (400mg default) - Half-life decay simulation - Home screen widget for one-tap logging - Siri / Shortcuts support - Last 7 days of history ■ iOS 18 features (Pro) - Live Activity + Dynamic Island for body caffeine + sleep-friendly time - Lock Screen Control + Control Center for one-tap logging - Action Button on iPhone 15 Pro and later - Half-life simulation chart ■ Pro (one-time, JPY 370) - Unlimited custom drinks - Live Activity / Dynamic Island - Lock Screen Control - Action Button integration - Full history + CSV export - Medium / Large widgets ■ Why we made it - Free to start (50+ presets + 3 custom drinks) - No login, no account - Caffeine records stay on device; anonymous usage events are optional - No subscription. Pro is one-time only. - Zero ads. ■ Science - Daily upper limit 400 mg (WHO / FDA / EFSA / Health Canada / Japan MHLW Sleep Guidelines 2023 consensus) - 50 mg "sleep-friendly residual" threshold per Japan MHLW Sleep Guidelines 2023 - Default half-life is 5 hours (individual range 3-7 hours) - All thresholds adjustable in Settings ■ Requirements - iOS 18.0 or later (for Live Activity / Lock Screen Control / Action Button) This app is intended as a caffeine intake tracker. It does not provide medical advice, diagnosis, drug-interaction checks, or individualised guidance for pregnant users, users with cardiac conditions, etc. Please consult a doctor or pharmacist for health decisions.

Screenshots

Caffie4 screens
Caffeine mg4 screens

Verdict

The call

The clearest difference is update cadence: Caffeine mg at weekly against Caffie's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Caffie sells 1 one-off in-app purchase and Caffeine mg sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Caffie ships an update every 4 months, Caffeine mg weekly. The most recent releases landed on November 12, 2026 and November 5, 2026 respectively.

Scorecard1 real difference · 6 level
Caffie versus Caffeine mg: the parameters behind the verdict, then further details
ParameterCaffieCaffeine mg
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 4 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad — betteriPhone
Requires iOS18.018.0
Further details — not scored
Size2 MB5 MB
Age rating12+4+
DeveloperKosuke Sakumakensuke ueda

In-app purchases

1 purchases

Caffie

One-time1
  • Caffie Pro$4.99
1 purchases

Caffeine mg

One-time1
  • カフェむンmg Pro$1.99

Questions

Is Caffie free?
Caffie is free to download, with in-app purchases available.
Is Caffeine mg free?
Caffeine mg is free to download, with in-app purchases available.
Do Caffie or Caffeine mg have ads?
Neither Caffie nor Caffeine mg shows ads.
Which is updated more often, Caffie or Caffeine mg?
Caffie ships an update every 4 months, and Caffeine mg weekly. Most recently, Caffie was updated on November 12, 2026 and Caffeine mg on November 5, 2026.

Other comparisons