O2 Buddy: Blood Oxygen SpO2

O2 Buddy: Blood Oxygen SpO2

Saturation Levels & Trends

140 ratings
24 reviews
$0.99 Free
In-App Purchases

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Price history


Details

Released
August 29, 2025
Updated
October 31, 2026

Features

O2 Buddy: Blood Oxygen SpO2 screenshot #1 for iPhone
O2 Buddy: Blood Oxygen SpO2 screenshot #2 for iPhone
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About

Easily monitor your blood oxygen levels with real-time data and clear charts. Track daily averages and wellness trends, with instant syncing from HealthKit to your Apple Watch. Your health data remains private and secure on your device.

✓Real-time blood oxygen readings
✓Clear charts and instant data
✓Syncs with HealthKit
✓Apple Watch integration
✓Daily average comparisons
✓Private and secure data storage
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What's New in O2 Buddy

2.1.1

October 31, 2026

• Background App Refresh: O₂ Buddy now appears under Settings → General → Background App Refresh, so iOS can wake the app for new readings while it's closed. A new onboarding step and a one-time reminder help you turn it on. • Keep Readings Flowing guide: clearer steps for the Shortcuts automation, including the Apple Intelligence screen and what to search for. • Settings shows a warning when Background App Refresh is off. • Smaller widget extension.

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Subscriptions & In-App Purchases

$2.99

O₂ Buddy Pro

Trends, watch history, vitals and export.

User reviews

A must have app if you have an Apple Watch Series 9 or newer.

This app is genius! I got it originally when I had an Apple Watch Series 8. The 8 will actually show your O2 on your watch. O2 Buddy goes above and beyond! It gives you a list of exact readings by %. Not just a bunch of dots. When I got my new Apple Watch 12, I knew I'd need this app in order to see my O2 stats on my watch. It shows a list of all readings, even the ones done in the background while I'm sleeping. The Pro app on my IPhone goes way beyond this! It shows my heart rate and breathing rates as well, before and after the O2 reading. Lots of useful data makes the Pro version a no brainer. You can even export data to share with your Dr. The Pro version is well worth the few dollars!
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Excellent App

It’s my go-to app to check my Oxygen levels.

I have asthma and also Central Sleep Apnea, where your brain just forgets to tell your lungs to breathe.

I also sometimes when I focus on something I also stop breathing.

This is now my main app to see how my oxygen levels are doing during the day and how I did while I slept.

Well worth the low cost.
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Big improvement

I’ve been using this from the beginning. It really works great it’s really been improved. It sinks with data that comes from my watch back to my phone back to my watch. It works great.

Blue Blood

This app is easy to use and beneficial for tracking your daily health. It is easy to set up and send notifications of the information to your phone. I like how everything flows and is easy to setup.

Doesn’t list which watches it works with.

I have a SE2 and an iPhone13. The app says it works with the iPhone, but does not say that it doesn’t work with the SE2 watch.

Response from developer

Sorry about that. The SE2 doesn’t have the blood oxygen sensor. Sadly Apple doesn’t let me reject watches. You may still be able to request a refund from Apple.

Developer apps

FAQ

What does O₂ Buddy do?

O₂ Buddy provides a fast and seamless way to view your blood oxygen (SpO2) readings. It displays your latest data in clear charts, syncs instantly from HealthKit, and allows you to compare daily averages to understand your wellness trends.

How does the app handle my health data?

The app is designed for privacy and security. Your blood oxygen data stays on your device and utilizes Apple's secure HealthKit storage. No data is shared externally.

Is O₂ Buddy compatible with Apple Watch?

Yes, the app is specifically designed for Apple Watch, offering lightweight, fast, and glanceable access to your SpO2 readings. New samples recorded on your watch sync immediately for viewing.

Who would benefit from using this app?

This app is ideal for anyone who is tracking their sleep, fitness, or overall wellness and wants an easy and accessible way to monitor their blood oxygen levels. It helps in understanding wellness trends at a glance.

Is there a cost to use O₂ Buddy?

Based on the provided information, O₂ Buddy is available for free. It does not appear to have any in-app purchases or advertisements.