Caffeine mg: Half-life Tracker Apple

Caffeine mg: Half-life Tracker

Track caffeine, predict sleep

Features & Capabilities

Log caffeine in one tap. Live Activity shows the time your body caffeine drops below the sleep-friendly threshold. No login. On-device only. No medical advice.

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, cloud-free, on-device-only data

■ 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
  • On-device only, never sent to cloud
  • 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.

User Growth & Download Statistics

App
By:
kensuke ueda
Rating:
5.00
(1)
5.00
Version:
1.1.3 Last updated: 2026-05-03
Version code:
885174244
Creation date:
2026-04-23
Compatible devices:
Size:
1.71MB
URLs:
Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-05
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
kensuke ueda
Apple Apps Store
https://apps.apple.com/jp/app/caffeine-mg-half-life-tracker/id6763047063?l=en-US

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