HalfCaff

Track your body's caffeine level in real time using half-life science. Know exactly how much more you can drink before bed. 70+ drink presets included.

HalfCaff tracks your caffeine intake and shows exactly how much caffeine is in your body right now.

Using scientifically-based half-life calculations, HalfCaff answers the one question every coffee lover asks: "Can I have another cup and still sleep tonight?"

"○○mg remaining" — Based on your bedtime threshold and the FDA daily limit (400mg), see exactly how much more you can drink at a glance.

Features:

• Real-time body caffeine level with circular gauge
• Remaining allowance display ("○○mg OK to drink")
• 24-hour caffeine decay curve
• 70+ drink presets (Starbucks, Doutor, Tully's official data)
• Home screen widgets (Small & Medium)
• Dynamic Island & Live Activities
• Personalized half-life based on your caffeine sensitivity

HalfCaff Pro unlocks:

• Home screen widgets
• Dynamic Island display
• Unlimited history

Includes a 3-day free trial.

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