HR & SpO2 vs FastOnce

***Special Notice for Apple Watch Models Sold in the United States: This App operates strictly as a standalone watch application. Due to recent patent litigation and subsequent Apple official firmware adjustments, certain Apple Watch models (such as Series 9, 10, Ultra 2, and subsequent models) sold in the United States after January 2024 have system-level restrictions that disable the generation and synchronization of local blood oxygen data. Consequently, users with these US-region models will not be able to read or display blood oxygen data on the watch after downloading the app. Please note that this is not a software defect. Users who own the aforementioned restricted US-model devices are strongly advised to exercise caution before downloading or purchasing. We sincerely apologize for any inconvenience caused. ***For US Apple Watch users, you can download the iPhone companion app version to sync blood oxygen information from your phone. Please uninstall this standalone watch app before using the iPhone companion app version. Core Highlights Two Metrics in One, At a Glance - Dual Display: Seamless integration of Heart Rate and SpO₂. Turn the Digital Crown in the app to switch views smoothly—no more jumping between apps. - All-Style Complications: Elegant complications stay on your watch face. Customize with HR, SpO₂, or combined metrics to check health data instantly without opening the app. - Multi-Dimensional History: Access real-time HR and latest SpO₂ trends. Tap data ranges to view daily, 4/12/24-hour, and weekly fluctuation intervals directly on your wrist, complete with resting and walking HR averages. - SpO₂ Alerts & Interactions: Smart display of latest oxygen levels. Instantly track your physical state via clear visual alerts and subtle haptic feedback when SpO₂ drops below 90%. Tangible Native Quality, Visible Glass Aesthetics - Next-Gen Native UI: Tailored for watchOS. Built with fully native controls and a unique liquid glass effect for a translucent, lightweight interface that blends into the system. - Vivid Immersive Animations: Bring your data to life. The HR background pulses in sync with your heartbeat (long-press to feel the rhythm), while the blue SpO₂ ring glows and changes color when attention is needed. Deeply Integrated with Apple Watch Features - Universal Face Support: Fully compatible with graphic circular, corner, text, and modular rectangular complication styles to match any watch face layout. - Always-On Display (AOD): Smartly hides backgrounds and animations in AOD mode to save power while preserving key data. Wakes up instantly upon wrist raise to show real-time metrics. - Smart Stack Support: Fully optimized for watchOS Smart Stack, keeping your HR and SpO₂ metrics perfectly organized and readily accessible alongside other widgets. 100% Localized, Privacy First - Native HealthKit Access: Reads directly from official Apple Health data. - Safe Local Processing: All data is rendered entirely on-device. No uploads, no tracking, and no server logs—your privacy is absolute. Give Rhythm to Your Heartbeat, Give Color to Your Breath More than a complication, this is a piece of liquid art on your wrist. Every glance is a visual delight; every pulse is a guardian of your health. Unify your vital metrics today and unlock a futuristic era of wearable wellness. *This app is for general wellness and fitness tracking only and is not intended for medical use, diagnosis, or treatment. Please consult a doctor before making any medical decisions.

One giant button. That is the whole app. Tap it to start a fast, tap it to end. A real 24-hour clock face shows exactly where your fast sits in the day, not an abstract bar. Available in English, Spanish, French, Arabic, Russian, Hindi and Ukrainian. RAMADAN Switch on Ramadan mode and the timer stops being a number of hours you picked. Your fast runs from suhoor to iftar, worked out on the phone for wherever you are, and both times move a few minutes every day exactly as they really do. Six calculation methods: Umm al-Qura, Dubai, the Egyptian General Authority, the Muslim World League, Karachi and North America. The one used where you are is chosen for you. Everything is computed on the device from your location, so it works with no signal at all and nothing is sent anywhere. Ramadan mode appears in the app as the month comes round. WHY FASTONCE Nearly every fasting app rents you a timer. You answer a quiz, hand over an email, then pay monthly for a clock. FastOnce asks for none of that. No account, no sign-up, and it opens straight onto the button. WHAT YOU GET, FREE A dial that actually reads as time The ring wraps a 24-hour wall clock, so you can see at a glance that your fast ends at 8pm rather than decoding a percentage. Plans that fit your day 12:12, 14:10, 16:8, 18:6, 20:4 and OMAD, or set your own hours. You can also pick the time you want to finish and the length is worked out for you. It keeps going by itself When your fast ends the eating window opens, and when that closes the next fast begins. Weeks can pass without opening the app. Forgot to hit start Backdate the start time and the ring, the stages and every reminder recalculate instantly. Stages, explained in plain language Blood sugar drop, fat burning, ketosis and autophagy, each with a short friendly explanation. No clinical claims, no scare tactics. Your calendar, your streaks, your totals A month calendar of completed fasts, current and longest streaks, and your totals. Free, and staying free. Gentle nudges, only if you want them Optional pings at the halfway mark, at each stage, when your fast completes, and short encouragement while you are in it. Quiet overnight. Your fast, outside the app The running fast lives on the Lock Screen and in the Dynamic Island, counting down without the app open, and it stands up in StandBy while the phone charges. There are Lock Screen widgets, a home-screen widget in three sizes, a Control Center switch, and "start my fast" for Siri. Made for iPad The dial takes the full screen and the four destinations move into a sidebar, so the whole app is one tap deep. FASTONCE PRO, ONE PAYMENT Pro is a single purchase. No subscription, nothing renews. It adds three things and nothing else: Charts and trends Hours per day, how often you reach your goal, your weekly average, and the hour you actually start. Export your log Every fast you have finished, as a spreadsheet file that leaves the app and is yours to keep. Still no account, still offline Pro changes what you can see, not where it lives. PRIVACY No account, no analytics, no advertising, no server of ours. Nothing you record ever leaves your iPhone, and neither does your location. The only time FastOnce talks to anything is when you buy Pro, which goes through the App Store. FastOnce shares general wellbeing information, not medical advice. Talk to a doctor before changing your eating habits.