Halvo vs Fasto

Your last coffee decides your night. Halvo shows you how much caffeine is actually working in you right now — and tells you the point after which the next cup starts costing you sleep. Your personal cut-off. Most caffeine apps count milligrams. Halvo works with the caffeine that actually reaches your system: it rises, peaks and fades. Halvo predicts how much of it is still there when you go to bed. YOUR PERSONAL CUT-OFF Everyone clears caffeine at a different speed. Halvo shows you the latest you can have a cup without too much of it still active when you fall asleep. LOG IN SECONDS Add coffee, espresso, tea, energy drinks, soda, mate or your own pre-workout in a few taps. Halvo sums it up automatically and shows how much is still working. ON YOUR HOME SCREEN AND ON YOUR WRIST The widget shows your level and your cut-off without opening the app — one tap logs your favourite drink. In the evening it switches to "lights out" on its own. Plus Apple Watch with a complication for a glance-and-go check. SEE YOUR CURVE Watch caffeine rise, peak and fade on a real concentration curve — and see exactly where you'll land when your head hits the pillow. A MODEL THAT LEARNS YOU — HONESTLY (PRO) With your permission, Halvo reads your sleep, heart rate and HRV from Apple Health and learns your personal caffeine half-life over time. Here's what makes it different: when the signal in your data is too weak to be sure, Halvo says so and keeps using the population value — instead of faking precision it doesn't have. WORKS WITH YOUR WEARABLES (PRO) Apple Watch, Oura, Whoop, Garmin — anything that syncs sleep and heart data to Apple Health. Halvo never connects to those services directly; it only reads what's already in Apple Health. PRIVATE BY DESIGN Your intake and health data are processed on your device. Halvo doesn't sell your data. FREE & PRO Logging caffeine, seeing your curve, using the widget and finding your cut-off are free. Halvo Pro adds the personal learning model and the nightly sleep analysis. Halvo Pro: • Monthly – $3.99 • Yearly – $24.99 (with 1 month free) • Lifetime – $44.99 one-time (no subscription) Payment is charged to your Apple Account. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. Lifetime is a one-time purchase. Prices may vary by region. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://halvo.jnmcloud.de/privacy.html Halvo is not a medical device and does not diagnose, treat or prevent any condition. It helps you make more informed choices about caffeine.

Fasto is an intermittent fasting timer that explains, hour by hour, what is happening inside your body — and shows you the study behind every claim it makes. WHAT YOU WILL NOT FIND No subscription. No in-app purchases. No ads. No account to create. No analytics and no trackers. And no servers of ours: your fasts live on your iPhone and, if you turn sync on, in your own iCloud. Never in mine. It works offline. SCIENCE WITH ITS SOURCE ATTACHED The eight metabolic phases cite the published work they rest on, with a direct link to PubMed so you can read it yourself. So does the guide on breaking your fast. And where the literature does not support a claim, Fasto does not make it: no miracle promises, no tidy numbers without evidence. WHILE YOU FAST • An animated ring with your progress, the phase you are in and a countdown to the next one. • Eight phases from 0 to 72 h: stabilisation, glycogen, gluconeogenesis, early ketosis, full ketosis, autophagy, deep autophagy and immune renewal. • Tips that change with the phase, a water counter, and an alert as each phase begins. ON YOUR WRIST AND ON YOUR SCREEN • An Apple Watch app to start and stop from your wrist, plus watch face complications. • Home Screen and Lock Screen widgets with a button, without opening the app. • A Live Activity in the Dynamic Island: your fast always in sight. ON ALL YOUR DEVICES Your fasts sync over iCloud between iPhone and iPad. No account and no servers of ours — it is your iCloud. Change phones and your history is still there. And on iPad it is not the iPhone app stretched out: it has its own two-column layout. Everything scales with Larger Text and works with VoiceOver. WHEN YOU FINISH A summary of what you achieved, the phase you reached, your personal record — and a guide on how to break the fast based on the hours you lasted, because coming off 14 h and coming off 30 h are nothing alike. YOUR HISTORY, WITH INSIGHTS Total, average and record, plus the patterns behind why you tend to stop, how each fast actually felt, and which durations suit you best. Milestones that add up and are not lost the day you slip. YOUR MEASUREMENTS, NO VERDICTS Log your weight and waist whenever you like and see how they change over 30, 90 or 180 days. Fasto shows the numbers and their variation, with no good-or-bad colours and no punishing streaks. The reading is yours and your doctor's. TO TAKE TO YOUR DOCTOR A PDF report with your period, frequency, adherence and longest fasts, ready to share. If your doctor is going to weigh in on your fasting, let them do it with data. A PLAN FOR EVERY PACE 12:12, 14:10, 16:8, 18:6, 20:4, OMAD and custom. Forgot to hit start? Adjust the time whenever you like. IN SIX LANGUAGES English, Spanish, French, Italian, German and Brazilian Portuguese, switchable inside the app. Light theme, dark theme or follow the system. ONE PAYMENT, FOR LIFE You buy Fasto once and it is yours forever. Every feature and every future update is included. No premium tier, nothing behind a paywall, no renewal reminders. IMPORTANT NOTICE Fasto is an informational and educational tool. It is not a medical device: it does not diagnose, treat, cure or prevent any disease, and it is never a substitute for the judgement of a healthcare professional. ALWAYS consult your doctor before starting any fasting routine. This matters especially if you are pregnant or breastfeeding, if you have or have had an eating disorder, if you have diabetes, kidney or liver conditions, if you are under 18, or if you take medication that must be given with food. Use of this app is the sole responsibility of the user. The developer accepts no responsibility for the decisions you make or for the consequences of applying fasting to your health. If at any point you feel unwell, dizzy or weak, stop fasting and seek medical attention.