# O2 Buddy: Blood Oxygen SpO2 — Saturation Levels & Trends

> View and track blood oxygen (SpO2) levels synced from HealthKit. (iPhone/iPad app by Minorbits LLC.)

- Source: https://appshunter.io/ios/app/o2-buddy-blood-oxygen-spo2/id6751239297 (this page in markdown: same URL + `.md`)
- Developer: [Minorbits LLC](https://appshunter.io/developer/1072921823)
- Category: Health & Fitness, Lifestyle
- Price: $0.99 with in-app purchases
- Rating: 4.60/5 from 46 App Store ratings · 21 written reviews indexed
- Age rating: 12+
- Requires: iOS 18.0 · 7 MB
- Languages: American English
- Released: 2025-08-29
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/o2-buddy-blood-oxygen-spo2/id6751239297/reviews.md

## What is O2 Buddy?

O₂ Buddy makes your blood oxygen readings effortless to see, understand, and track - on your iPhone, your Home Screen, and your wrist.

Your Apple Watch already measures your blood oxygen throughout the day and night. O₂ Buddy turns those readings into something you can actually use.

SEE YOUR TRENDS
• Switch between 24 hours, 7 days, 30 days, and 90 days with a tap
• Every day shows its full range alongside its average, so you see the whole picture - not just the last number
• Watch your average rise or fall compared to the period before

DAY VS NIGHT
• Compare your daytime readings against your overnight ones, side by side
• Wear your watch to sleep and see how your oxygen behaves while you rest

EVERY READING IN CONTEXT
• Tap any reading to see where it falls within that day
• Compare it against readings taken around the same time on other days
• Know instantly whether it's normal, below normal, or low

ON YOUR WRIST
• A fast, glanceable Apple Watch app with your recent readings and 7-day trend
• Complications in circular, rectangular, corner, and inline styles - including a color-coded gauge ring and a 7-day trend sparkline
• Readings sync from your iPhone as soon as they're recorded

ON YOUR HOME SCREEN
• A widget for your latest reading
• A widget for your 7-day trend

LOW OXYGEN ALERTS
• Optional notifications when a reading falls below a threshold you choose

PRIVATE BY DESIGN
• Read-only access to Apple Health
• Your data stays on your devices - never uploaded, never shared, never sold

Also includes Light, Dark, and Automatic appearance, 12- or 24-hour time, and built-in FAQs and support.

O₂ Buddy is not a medical device and is not intended to diagnose or treat any condition. Blood oxygen measurements are recorded by Apple Watch and stored in the Health app.

## Key features

- Real-time blood oxygen readings
- Clear charts and instant data
- Syncs with HealthKit
- Apple Watch integration
- Daily average comparisons
- Private and secure data storage

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| A Little Thanks | $0.99 | one-time |
| A Big Thanks | $2.99 | one-time |
| Above and Beyond | $4.99 | one-time |


## Chart rankings

- #71 in Top Paid · Health & Fitness (US App Store)

## Recent user reviews (10 of 21)

All indexed reviews: https://appshunter.io/ios/app/o2-buddy-blood-oxygen-spo2/id6751239297/reviews.md

### 5/5 — Blue Blood

*2026-05-13*

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.

### 1/5 — Doesn’t list which watches it works with.

*2026-04-29*

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.

**Developer response:** 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.

### 5/5 — Thank you

*2026-04-23*

Just helped someone setup their first Apple Watch. They are 79. You made my day. I don’t own a watch, I bought the app to show my appreciation.

### 2/5 — O2 Buddy: Used to be more useful

*2026-03-12*

I really miss the old on‑watch graph view. The current list of readings is much less useful at a glance, and only showing yesterday’s average makes today’s data feel incomplete. The mini trend graph on the watch was what made O2 Buddy stand out—please consider bringing a simple graph view back for recent readings and today’s evolving average.

### 1/5 — Waste

*2026-01-30*

Waste of money

**Developer response:** So sorry you feel that way. Did you have an issue with the app?

### 5/5 — Works great!!

*2025-12-28*

Very responsive. Nice work around not needing your iPhone

### 3/5 — Meh

*2025-12-19*

It works…kind of. I mean, my O2 readings show up on the watch, but not until I go to the phone and receive the notice about a new reading, so I might as well just use the phone.

**Developer response:** Sadly the app on the phone will need launched every so often. But it should need to be every single time unless you full close out the iPhone app each time.

### 4/5 — Confused about O2 updates.

*2025-11-30*

No idea why it works during the daytime, but will not update late at night or after midnight, early morning even if I take a manual reading, I still need to consult my iPhone for the O2 number.

**Developer response:** Sorry you’re having issue with the app. You can reach out through support in the app I’ll try to help figure out what’s going on.

### 3/5 — Installed and testing

*2025-11-25*

Soon I will post my opinions about this app to help and to contribute with anyone that wish meet it. For now it’s installed and showing only my O2 measurements from four days ago.

### 5/5 — BUILT BY THE GENIUS!

*2025-11-21*

PRICELESS!! BRAVO!!!

## Frequently asked questions about O2 Buddy

### 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.

## Version history (last 5 releases)

### 1.5 — 2026-07-30

Version 1.5 is the biggest update yet - a whole new way to see your blood oxygen over time!

TRENDS ON THE MAIN SCREEN
The chart at the top has been rebuilt. Switch between 24 hours, 7 days, 30 days, and 90 days, and see each day's full range along with its average. O₂ Buddy remembers whichever range you used last.

NEW: DAY VS NIGHT
Tap the moon to compare your daytime readings against your overnight ones. If you wear your watch to sleep, try this one first.

RICHER READING DETAILS
Tap any reading to see where it fell that day, how it compares to readings taken around the same time on other days, and whether it's normal, below normal, or low.

NEW TREND WIDGET
A new Home Screen widget shows your 7-day trend at a glance, in small and medium sizes.

NEW WATCH COMPLICATIONS
• A color-coded gauge ring for circular slots
• A 7-day trend sparkline for rectangular slots
• Older readings now dim, so you always know when you're looking at stale data

FASTER, MORE RELIABLE SYNC
New readings reach your watch and complications faster, and complication updates now keep working reliably all day long.

A FRESH LOOK
Onboarding has been redesigned, and you can now set the app to Light, Dark, or Automatic in Settings.

Plus a tip jar for anyone who'd like to support development - entirely optional, and it unlocks nothing.

Thanks for using O₂ Buddy!

### 1.4 — 2026-06-09

- You can now get low blood oxygen notification from the app.

### 1.3 — 2026-04-10

- Added widget support
- Added setting for 12/24 hour clock
- Improved sync
- Fixed UI bug if reading is lower than chart

### 1.02 — 2025-09-06

Fixed UI and sync issues.

### 1.01 — 2025-08-31

- Updated onboarding for new users.
- New Contact page for support and feedback

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All apps by Minorbits LLC: https://appshunter.io/developer/1072921823

## Related topics

[blood oxygen spo2 app](https://appshunter.io/ios/topics/blood-oxygen-spo2-app) · [sp02 monitor](https://appshunter.io/ios/topics/sp02-monitor) · [oxygen level checking](https://appshunter.io/ios/topics/oxygen-level-checking) · [blood oxygen level check](https://appshunter.io/ios/topics/blood-oxygen-level-check) · [oxygen channel](https://appshunter.io/ios/topics/oxygen-channel) · [blood oxygen spo2 tracker](https://appshunter.io/ios/topics/blood-oxygen-spo2-tracker) · [free oxygen monitor level](https://appshunter.io/ios/topics/free-oxygen-monitor-level) · [blood oxygen watch](https://appshunter.io/ios/topics/blood-oxygen-watch)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*