Blood Oxygen

Name: Blood Oxygen
Rating: 3.9 (128 reviews)
Author: Apple

By: Apple

Health & Fitness

Features & Capabilities

Blood Oxygen is a health and fitness extension that lets users measure blood oxygen saturation directly from the Apple Watch. It supports on-demand readings and continuous background monitoring throughout the day and during sleep when worn.

Your measurements are stored in the Health app on iPhone and can be filtered to view sleep-related values or high-elevation readings. Note: on certain US models sold after January 18, 2024 with part numbers ending in LW/A, data analysis is performed on the iPhone and results are viewable in Health.

User Growth & Download Statistics

App Sports Data Privacy & Security

By:

Apple

Rating:

3.90

(128)

Version:

1.7 Last updated: 2025-12-12

Creation date:

2020-09-16

Compatible devices:

Size:

1.81MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 145,356 ▼ 223

For Developers

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Contact the developer

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Developed by:

Apple

Apple Apps Store

https://apps.apple.com/us/app/blood-oxygen/id1505627452

User Reviews

Users mainly report accessibility and compatibility barriers: trouble downloading/installing on iPhone or Apple Watch, regional or account restrictions, and device compatibility problems. Some see the app’s core function as measuring blood oxygen and note potential use for asthma or aviation, and they like the animation. However, a key feature gap is missing low-oxygen alerts, and requirements aren’t clearly communicated by the store/health apps.

Pros

Measures blood oxygen levels
Appealing animation/UI
Potential usefulness for asthma management
Potential usefulness for pilots

Cons

Installation/download issues on iPhone/Apple Watch
Regional/account restrictions blocking download or use (e.g., US eligibility, Iran restrictions)
Compatibility issues with certain devices/models (e.g., Watch Series 6 in Iran, Siri's 3)
App store/Health app not stating clear requirements
Missing low blood oxygen notifications/alerts