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Tap the + button on the main screen. Select a drink from the list or enter a custom amount of caffeine in milligrams. The app will immediately begin tracking the decay of that intake.

CaffeineHalf uses the standard caffeine half-life of approximately 5 hours. The remaining caffeine level is calculated using exponential decay from the time you logged each intake. The graph shows your estimated caffeine level over time.

CaffeineHalf includes a built-in library of common caffeinated drinks with pre-filled caffeine amounts:

• Coffee (espresso, drip, cold brew, etc.)
• Tea (green, black, matcha, etc.)
• Energy drinks
• Soft drinks

You can also enter any custom drink with a specific caffeine amount.

Yes. When logging an intake, tap Custom to enter a drink name and its caffeine content in milligrams. Custom drinks are saved for quick access in future entries.

CaffeineHalf offers a one-time in-app purchase to unlock premium features. Go to Settings within the app and tap Unlock Premium. The purchase is processed through the App Store and unlocks all premium features permanently — no subscription required.

CaffeineHalf stores all data locally on your device. To move your data to a new device, use an iCloud Backup or a Finder/iTunes local backup of your current device, then restore that backup on your new device.

If you set up a new device without restoring from a backup, your intake history will need to be entered again.

Yes, completely private. All caffeine intake logs and data are stored only on your device. CaffeineHalf does not connect to any server, contains no analytics or tracking SDKs, and transmits no data anywhere.

See our Privacy Policy for full details.