CaffSense: Caffeine & Sleep

See caffeine and sleep together at last: half-life curve, your personal cutoff time and sleep correlation from Apple Health. No account needed.

Love coffee. Sleep better anyway.

CaffSense shows the caffeine in your body right now on a live half-life curve — and the exact time to stop so it's out of the way by bedtime.

Then it goes further: by quietly comparing your caffeine timing with your Apple Health sleep, CaffSense learns how your body clears caffeine — faster or slower than the textbook 4 hours — and tunes your curve and cutoff to match you.

• Live "caffeine on board" gauge & curve • Your personal cutoff time • One-tap logging, widget & Apple Watch • Sleep-pattern insights from Apple Health • Shift Mode for early, late and night shifts

Working shifts? Turn on Shift Mode and pick early, late or night. CaffSense moves your cutoff to the sleep window that actually follows your shift — not a fixed evening bedtime. It still uses your own logged intake and your learned half-life, so the time is yours, not a generic rule of thumb.

Private by design: your caffeine and sleep data stay on your iPhone. No account, no ads, no data sharing. Anonymous usage stats with no personal data — switchable off in Settings.

Free: today's curve & cutoff. Pro: full history, personal half-life & sleep insights.

Not medical advice. Patterns are observational and may be affected by stress, alcohol, exercise, illness, medication, and data quality.

CaffSense Pro: $1.99/month or $9.99/year. Your subscription renews automatically unless you cancel at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store settings.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://caffsense.com/privacy/