Caffeine Curve vs Steady

Caffeine Curve helps you track your estimated caffeine level in real time. Using your dietary caffeine entries from Apple Health, the app estimates how much caffeine may still be active in your body throughout the day. It uses an absorption and elimination model to give you a more useful picture than intake alone. It is designed for a simple purpose: to give you the most useful caffeine information quickly and clearly. Whether you are deciding on another coffee, trying to stay in a good range for focus, or avoiding caffeine too close to bedtime, Caffeine Curve helps you understand where you stand right now. Features - Track your estimated current caffeine level - See how your caffeine level changes throughout the day - Reads dietary caffeine data from Apple Health - Check your current level from the Lock Screen widget - Understand how long caffeine may remain active - Clean, simple interface designed for quick checks - Rich Home Screen Widgets: Keep an eye on your caffeine levels and daily trends without even opening the app, featuring beautiful charts and gauges - Smart Complications: New rectangular and dial-top complications clearly show the exact time of your next peak or when you’ll be clear for sleep. - Useful Notifications: Get pinged exactly when you hit your caffeine peak or when your system drops below your personalized sleep-ready threshold. - Peak & Sleep Indicators: Know exactly when your coffee hits its peak and precisely when you are cleared for a good night's sleep - Unmatched Personalization: Choose from 5 different sensitivity profiles to perfectly match your unique body chemistry and caffeine decay rate - Try It Demo Mode: Explore the app's full capabilities and stunning visual charts using sample data before committing to logging your own - Beautiful & Customizable Design: Experience a gorgeous new "Liquid Glass" aesthetic that feels right at home on iOS, plus full control over Light/Dark modes and all-new tinted app icons. Caffeine can be logged automatically by other apps that write to Apple Health, or added manually in the Health app under Nutrition > Caffeine. Caffeine Curve is free to use, with no ads and no in-app purchases. It was built from a real daily need: a simple way to understand caffeine levels clearly, quickly, and without unnecessary extras. Important Individual caffeine metabolism varies. Factors such as genetics, liver health, medications, and pregnancy can affect absorption and elimination. Caffeine Curve is for informational purposes only and does not provide medical advice.

Steady is built for shift workers, not 9-to-5. NEW IN 1.8 • A 3-minute reaction test before you drive home, compared with your own rested speed. A fatigue check, not a driving test. • Switching to nights or back to days: Steady plans the days around it, with bedtimes, light and a nap before the first night. • Your next 24 hours on one line: work, sleep, naps and your caffeine cutoff. • iPhone Duo: stand it half open and Steady becomes a nightstand. WHAT MAKES STEADY DIFFERENT • Drive home risk alert: warns you when fatigue makes the drive too risky. 17 hours awake is roughly a 0.05% BAC. Always free. • Roster import from a photo: point your camera at the schedule on the wall and confirm every day before it's saved. • An alertness curve that shows when you'll crash, plus the best windows for exercise, meals and light. • A sleep score measured against your own rotation, not a 9-to-5 clock. • Sleep debt and a payback plan built around your real rota. • Smart wake alarm: wakes you in light sleep within a window you choose, backed by a real system alarm on iOS 26 and later. • 290 coaching tips grounded in AASM, NIOSH and chronobiology research. • English and Spanish, written natively in both. • Private and on-device: no accounts, no servers, no tracking. For DuPont, 4-on-4-off, Panama, 12-hour rotations, fixed nights and on-call: healthcare, manufacturing, public safety, hospitality, transit and logistics. FREE • Drive home risk alert, reaction test and night-switch planner • Today's fatigue score and your next 24 hours • Shift templates, single-day changes and Calendar roster import • Sleep log with Apple Health sync (last 7 days) • Bedtime and wake check-ins • Wind Down: brown noise, pink noise and 4-7-8 breathing • Caffeine, alcohol, exercise and meal logging • Bedtime and shift-day reminders • Sleep Focus filter, Live Activity and a Control Center nap button • iPhone Duo nightstand, Apple Watch app, Siri and Shortcuts • A starter set of coaching tips STEADY PRO Free for 7 days, then $3.99 a month or $24.99 a year. • Roster import from a photo • Alertness curve and light plan • Fatigue score breakdown and 7-day forecast • Sleep debt ledger and shift-aware sleep score • Sleep stages, overnight vitals and Discoveries • Smart wake alarm and nap planner • Caffeine cutoff and light reminders • Custom rotations and the chronotype quiz • Daily briefing, weekly review and Ask Steady, on-device • Widgets and Watch complications • Full history, long-range stats and exports • The full coaching library Works on iPhone, iPad, Apple Watch and the iPhone Duo inner display, with two pages split on the fold. Steady is not a medical device. Always consult a licensed clinician for medical advice. SUBSCRIPTION TERMS Steady Pro is an auto-renewing subscription, $3.99 a month or $24.99 a year. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. Manage or cancel anytime in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jcmobileappstudio.com/apps/steady/privacy/