HR & SpO2 - Companion App

This iPhone companion app is optimized for the US version of the Apple Watch, allowing you to sync and display your iPhone's blood oxygen data on your Apple Watch.

*iPhone Companion App Description This iPhone companion app is specifically designed for the US version of the Apple Watch, which cannot read local blood oxygen data from the watch. It adds health data synchronization between the iPhone and Apple Watch, as well as iPhone lock screen widget functionality. US version users should uninstall the standalone Apple Watch app before using this companion app, and ensure that both this iPhone companion app and the Apple Watch app remain running in the background during use. Non-US Apple Watch users and those who do not need to use the iPhone lock screen widgets can download the standalone Apple Watch version of the app for a lighter user experience.

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 26. 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.

iPhone Companion App Exclusive Features

• Apple Watch-style integrated heart rate and blood oxygen complications allow quick access to health information right from the iPhone lock screen.

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.