Fat Burned vs BeatSleep

Ever wonder how much fat you actually burn in a day? FatBurn turns your Apple Health data into clear, actionable fat burn estimates — no guesswork, no calorie counting, no manual logging. Just open the app and see how much fat your body has burned today, during workouts, this week, and over your entire fitness history. HOW IT WORKS FatBurn uses established exercise physiology research to estimate fat oxidation from data already on your iPhone and Apple Watch: Heart rate samples from workouts and throughout the day Your age, weight, and biological sex from Health Workout duration, and intensity Calories are estimated using the Keytel formula (Keytel et al., British Journal of Sports Medicine, 2005). Fat burn is then calculated based on heart rate zone analysis — your body burns a higher percentage of fat at lower intensities and shifts toward carbohydrates at higher intensities. FatBurn classifies your effort into low, moderate, and vigorous zones and applies research-backed fat oxidation percentages to each. WHAT YOU SEE Daily Fat Burn — total fat burned from all activity and resting metabolism Workout Fat Burn — fat burned specifically during recorded workouts Weekly Trends — a 7-day chart showing daily fat burn with weekly totals Workout Breakdown — individual workout cards with fat burn, duration, and calories Lifetime Total — cumulative fat burned from your earliest HealthKit record Customizable Goals — set daily, workout, and weekly fat burn targets based on CDC and AHA guidelines All values display in grams or ounces, with support for kilograms and pounds for larger totals. APPLE WATCH APP FatBurn includes a full Apple Watch companion app so you can check your fat burn stats right from your wrist: Daily and workout fat burn at a glance Active calories, workout minutes, and weekly totals Syncs automatically with your iPhone via HealthKit Designed for quick, on-the-go reference WATCH COMPLICATIONS Add FatBurn to your watch face for instant access. Complications are available in multiple styles and sizes, showing your choice of: Daily Fat Burn Workout Fat Burn Weekly Fat Burn Choose which metric appears on your watch face from the watch app on your iPhone. Complications update throughout the day with HealthKit background delivery. THE SCIENCE FatBurn doesn't just make up numbers. Every calculation is grounded in peer-reviewed research: Keytel Formula for calorie estimation from heart rate (J Sports Sci, 2005) Achten & Jeukendrup's Maximal Fat Oxidation research (Int J Sports Med, 2003) CDC weight loss guidelines (0.5–1.0 kg/week safe range) AHA physical activity recommendations (150 min/week moderate exercise) Full methodology with formulas and citations is available inside the app under Settings. PRIVACY FIRST Your health data stays on your device. Period. FatBurn reads data only from Apple HealthKit on your iPhone and Apple Watch No data is uploaded to any server — all processing happens locally No accounts, no sign-ups, no tracking No third-party analytics or advertising SDKs We cannot see your health data, and we never will FatBurn requires HealthKit access to function. You control exactly which data types you share through the standard iOS Health permissions screen. SUBSCRIPTION FatBurn offers a 1-week free trial with full access to all features. After the trial, continue using FatBurn for $4.99/year. No features are locked — the subscription simply lets you keep using the app you already enjoy. 1-week free trial $4.99/year after trial (price may vary by region) Cancel anytime — no charge if you cancel during the trial Manage or cancel from Settings > Apple ID > Subscriptions DISCLAIMER FatBurn provides estimates based on published exercise physiology formulas. This app is not intended to provide medical advice. Consult a healthcare professional before making health decisions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

BeatSleep does one thing. Your Apple Watch reads your heart, then vibrates on your wrist just under your own rate. Your pulse follows the vibration down, and you fall asleep. No sound, and nothing to watch. The screen exists only to prove it is working, and it fades away once you no longer need it. HOW A NIGHT GOES For the first 45 seconds nothing vibrates, while BeatSleep measures the rate you are actually resting at. Then the cadence anchors there and sheds four beats every ten minutes, staying just under your pulse: far enough to lead, close enough to be followed. If a noise wakes you, it stops pulling and re-anchors to your real heartbeat within a minute. Apple Watch gives an app only a handful of vibration patterns, and most carry a tone through the speaker. BeatSleep uses the one that does not, so the person beside you sleeps through your night. The night closes itself five minutes after your pulse has settled. A hard fifteen minutes, or the whole night, are yours to set instead. IN THE MORNING Health will tell you that you slept seven hours. BeatSleep will tell you that forty minutes of them were awake in eleven separate pieces, how long you took to fall asleep, and how far your pulse fell below your resting rate. It reads Apple Health, so there is something to show you on the very first morning. ON YOUR HOME SCREEN A widget that leads with the figure you choose: how long the descent took, the nights in a row, the lowest rate you held, or how closely your pulse followed the vibration. And every night is in Spotlight, so you can ask for one in your own words and open it. The index is built on your device and stays there. NOTHING LEAVES YOUR DEVICES No account. No server. No analytics, no advertising identifiers and no third-party SDKs. Your heart rate is read from HealthKit on the watch, the summary is computed there overnight, and it travels to your iPhone over Apple's encrypted device link. If you turn on iCloud sync, your nights go to your own private iCloud, in encrypted fields, never to us. You can export everything as a file, or erase it for good, at any time. BEATSLEEP PRO Free leads three nights in any seven days, and they are whole nights: the same descent, the same failsafe, the same morning summary. Pro lifts the count to every night, and adds your full history, every month behind you, the Thrum and Hush waveforms, a breath with your own four counts, iCloud sync, and the rest of the colors. BeatSleep Pro is €3.99 a month or €24.99 a year, billed to your Apple Account and renewing until you cancel, which you can do at any time in Settings. Terms of Use: https://javi7899.github.io/beatsleep-web/terms.html Privacy Policy: https://javi7899.github.io/beatsleep-web/privacy.html Requires an Apple Watch. BeatSleep is not a medical device: it does not diagnose, treat or prevent any condition.