HR & SpO2 - Widget Union

***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.