Caffeine: Coffee & Sleep

Can I have another coffee and still stay within tonight’s caffeine target? Caffeine gives coffee drinkers a useful answer before the next cup. Log coffee, espresso, tea, matcha, energy drinks, or a custom amount, then see what may remain at bedtime and whether another familiar drink fits your target. KNOW WHAT FITS TONIGHT — FREE • See your estimated caffeine now and at your chosen bedtime • Get a clear On track, Near target, or Above target state • Check whether your usual drink fits before you log it • Log quickly from iPhone, Apple Watch, or an interactive widget • Search familiar drinks, save favorites, choose a serving, or enter exact milligrams • Tune your caffeine response, usual sleep time, and bedtime target • Review a transparent decay curve and formula The free forecast is based on your settings, caffeine log, and bedtime target. It does not connect to sleep data. LEARN FROM YOUR ACTUAL SLEEP WITH CAFFEINE PRO Caffeine Pro connects what you drink with when you actually sleep. Connect Apple Health or enter sleep manually to build private, on-device patterns: • First caffeine-and-sleep pattern after 7 usable nights • Lower-versus-higher bedtime comparison after 14 usable nights • Conservative personal guidance after 28 usable nights, only when enough evidence supports it • Corrections, reversible exclusions, and guided earlier-cutoff experiments COFFEE FIRST, EVERY CAFFEINE SOURCE COVERED Choose from coffee, espresso, tea, matcha, energy drinks, and other popular servings. Save the drinks you actually have or log a custom caffeine amount. PRIVATE BY DESIGN No account. No ads. No analytics. No third-party tracking. Your caffeine history, preferences, and optional Pro sleep data stay on your devices. Estimates and observed patterns are for planning only. Caffeine does not measure caffeine in your body, prove that caffeine caused a sleep outcome, guarantee sleep quality, or provide medical advice. Individual caffeine response varies. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/