Caffeine Clock: Bedtime
Coffee, tea & energy drink log
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Not how much you drank — how much is still in you. See what remains at bedtime and when it will be mostly gone. One tap to log. No account, no ads.
Not how much you drank - how much is still in you now, and how much will still be there at bedtime.
One tap to log
Set up to four usual drinks and log them the moment you tap. Mistaps are undoable, and you can move a record to "1 hour ago" afterwards.
The hours you could not see
The ring at the centre - the Caffeine Halo - shows what is estimated to remain. It also shows the estimate at your bedtime and when it will be mostly gone.
Connect Health (Pro)
Compare the estimate at bedtime with your time asleep, night wakings, and next-morning HRV, using your records only. The analysis stays on this device and is never sent anywhere.
Widgets and Apple Watch
Check from the Lock Screen, Home Screen, or your watch face - and log right there. Apple Watch logs offline and syncs later without duplicates.
Two themes
Calm roast and crema tones, or a dark base with electric accents. Switch any time in Settings.
Never blames you
Days without records are not failures. No streak pressure, and notifications carry neutral wording only.
No account
No sign-in. Your records stay on your device.
Caffeine Clock Pro (one-time purchase) unlocks sleep relations, every widget, Apple Watch, custom presets, and CSV export. Logging, estimates, the calendar, and today's and weekly stats stay free.
Note: caffeine amounts shown are estimates, not measurements. Do not use them for medical, medication, or driving decisions.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Tidied up how the app is described on the App Store. No changes to the app itself.
The developer, kazunari aoki, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- kazunari aoki
- Size
- 6.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
13+
- 13+
- Infrequent
Alcohol, Tobacco, Drug Use or References
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Caffeine Clock Pro $9.99
- Copyright
- © 2026 Kazunari Aoki