Cira: Caffeine & Sleep
iOS app by ARVIDS KAPUSTA. Health & Fitness · ARVIDS KAPUSTA
- Store rating
- 0 / 5
- Store rating count
- 0
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 1.0
- Listing last refreshed
- 2026-09-06
View the original store listing
Store description excerpt
How much caffeine is still active in you — and how late you can drink and still fall asleep tonight. Most trackers count the cups you drank. Cira counts what is left: caffeine climbs for about 45 minutes, then leaves at a rate set by your own metabolism, not by an average adult. Between a fast metabolism and a slow one, the difference is hours of sleep. FREE FOREVER • Log any drink — coffee, tea, energy drinks • Active caffeine right now, in milligrams • Whether tonight holds, and when you will be clear • The hour of your last safe cup • Today's curve: where the peak was and where it goes next • Metabolism speed and your sleep times PREMIUM • Check any drink before you pour it: tonight with it and without it, side by side • The full physiology model: smoking, contraceptives, pregnancy, age, your own threshold and half-life • History beyond seven days, and weekly statistics • Your own drinks with exact numbers • A reminder before your last cup • The hours your caffeine is actually working TUNED TO YOU Smoking clears caffeine almost twice as fast. Contraceptives and pregnancy slow it down. After 65 it slows again. Cira applies all of it, and if you know your own half-life you can set it by hand. BEFORE YOU DRINK Check any drink at any hour before you pour it. Cira puts tonight with it and without it side by side. The log-it-anyway button never disappears: the job is to name the price, not to take the choice away. WHO IT IS FOR People who drink coffee after lunch and then lie awake. People cutting down who want to see what changes. People who take an energy drink before training — and get up early. Everything you log stays on your iPhone. There is no account. Cira gives an estimate, not a medical diagnosis. It uses a standard one-compartment pharmacokinetic model with first-order absorption. That is a good approximation, but no app can measure your blood. See a doctor about sleep problems. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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