# SPO2er: Blood Oxygen on Watch — SPO₂ Monitoring from HealthKit

> Blood oxygen monitoring and trend visualization from HealthKit data. (iPhone/iPad app by Kevin Edwards.)

- Source: https://appshunter.io/ios/app/spo2er-blood-oxygen-on-watch/id6755498703 (this page in markdown: same URL + `.md`)
- Developer: [Kevin Edwards](https://appshunter.io/developer/1836835800)
- Category: Health & Fitness, Lifestyle
- Price: $0.99
- Rating: 4.80/5 from 6 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 26.0 · 7 MB
- Languages: American English
- Released: 2025-12-01
- Data updated: 2026-09-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/spo2er-blood-oxygen-on-watch/id6755498703/reviews.md

## What is SPO2er?

SPO2er gives you a clear, easy-to-understand view of your blood oxygen levels throughout the day. Using data already stored in the Health app, SPO2er displays your latest reading, 24-hour trends, high/low values, averages, and a complete history, both on your iPhone and Apple Watch.

There are no accounts, no ads, no servers, and no external data sharing. All information comes directly from HealthKit and stays securely on your device.

Features:

• Latest Blood Oxygen Reading
See your most recent SPO₂ measurement, formatted clearly with the exact time it was taken.

• 24-Hour Trend Graph
View an elegant sparkline showing how your SPO₂ changed over the past day, with high, low, and average values.

• Detailed History
Scroll through a timestamped list of SPO₂ samples from the last 24 hours.

• Apple Watch Complications
Choose from multiple complications that update automatically when new readings are available, so your most recent value is always just a glance away.

• Red Highlighting of User-Set Low Values
Set the lower threshold you want for highlighting SPO₂ values viewed on the Watch, Complication or SPO2er app on the iPhone.

• iPhone ↔ Watch Sync
Your iPhone reads SPO₂ data from the Health app and delivers it directly to the watch app and complications.

• No Sensors Accessed
SPO2er does not measure blood oxygen.
Instead, it reads the data you already have in the Health app, whether from Apple Watch, compatible third-party monitors, or other HealthKit-enabled devices.

Why SPO₂ Tracking Matters

Many wellness devices record blood oxygen throughout the day and night. SPO2er helps you keep an eye on overall trends, see how values vary, and stay more aware of changes, all using the health data you already collect.

Privacy-First Design

Your health information stays entirely on your device.
SPO2er does not collect, transmit, or store data on any server.
Permissions are used solely to read blood oxygen values from the Health app.

For Anyone Who Uses HealthKit

SPO2er works with:
• Apple Watch models that support blood oxygen
• Third-party SPO₂ monitors that write to HealthKit
• Wellness devices and apps that sync SPO₂ into the Health app
• Manually entered SPO₂ data in the Health app

If it’s in HealthKit, SPO2er can display it beautifully.

## Key features

- Latest blood oxygen reading display
- 24-hour trend graph
- Detailed historical samples
- Apple Watch complications
- Customizable low value highlighting
- iPhone and Watch synchronization

## Chart rankings

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

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/spo2er-blood-oxygen-on-watch/id6755498703/reviews.md

### 5/5 — Working as expected.

*2026-03-13*

Complication now showing and performing as expected.

**Developer response:** Complications won't automatically show up on their own.  You need to edit the watch face to add the complication.  We'll edit instructions to make this clear, but this is true with all complications.  Additionally, you need to be using a watch face that supports complications.  There are SPO2er complication styles for every face that supports complications, but some watch faces don't support any complications.

For email, they seem to be coming through on our end, and not sure if this was a temporary issue.

### 5/5 — Apple Watch 10 Complication

*2026-02-18*

The app works perfectly and have the Apple Watch complication back on a series 10!

### 1/5 — Complication doesn’t show up.

*2026-01-14*

Developers complication doesn’t show up. App however does show historical data acquired from health.  Moot point if complication is unavailable on the watch. Emailed developer from  their website using generated email address from said site. Email bounced back undeliverable. Looks like  a loss of 99 cents uninstalled.

### 5/5 — Better than Vitals

*2025-12-26*

I upgraded my watch to a new one that doesn’t show Blood Oxygen on the watch.  Now I can!   Even better I get history view and see low values.   Well done.

## Frequently asked questions about SPO2er

### Does SPO2er measure blood oxygen?

No, SPO2er does not have its own sensors and does not measure blood oxygen. It reads and displays blood oxygen data that is already stored in your HealthKit data, which may come from an Apple Watch or other compatible devices.

### How does SPO2er protect my privacy?

SPO2er is designed with privacy as a top priority. It does not collect, transmit, or store any of your data on servers. All information is read directly from HealthKit and remains securely on your device.

### What devices does SPO2er support?

SPO2er is compatible with iPhones and Apple Watches. It works with Apple Watch models that support blood oxygen monitoring, as well as third-party SPO₂ monitors and wellness devices that sync data into Apple's Health app.

### Is SPO2er free to use?

SPO2er is a paid application, available for a one-time purchase of $0.99. It does not have any in-app purchases or advertisements, ensuring an uninterrupted user experience.

### How often is SPO2er updated?

The latest version of SPO2er is 1.2, which was last updated on January 4, 2026. Updates typically include improvements to features, performance, and compatibility with the latest operating system versions.

### Can I set alerts for low blood oxygen with SPO2er?

Yes, SPO2er allows you to set a lower threshold for your blood oxygen values. When a reading falls below this set value, it will be highlighted in red on your Apple Watch, complication, or the iPhone app for easy identification.

### What kind of data does SPO2er show from HealthKit?

SPO2er displays your latest blood oxygen reading with its timestamp, a 24-hour trend graph showing high, low, and average values, and a detailed history of all recorded SPO₂ samples from the past 24 hours.

### Does SPO2er have ads?

No, SPO2er is completely ad-free. The app is designed to provide a clean and focused experience, with no advertisements interrupting your view of your health data.

## Version history (last 3 releases)

### 1.2 — 2026-01-04

• Color picker for highlighted low threshold values.
• Low threshold line in graphs.
• Icons display properly in all iOS 26 modes (Default, Dark, Clear and Tinted).
• Optimizations of data pipeline (faster updating and more battery efficient).
• Detailed connectivity info (at bottom of watch app).
• Better coordination with multiple watch use.

### 1.1 — 2025-12-16

• New corner complication option.
• Minor optimizations.

### 1.0 — 2025-12-02

No release notes.

## Apps similar to SPO2er

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Watch Wrist Temp: Tracker](https://appshunter.io/ios/app/watch-wrist-temp-tracker/id6740745491) | 2.9 (16) | Free | Health & Fitness |
| [Blood Ox](https://appshunter.io/ios/app/blood-ox/id6708240968) | 5.0 (1) | Free | Health & Fitness |
| [SpO2 Watcher](https://appshunter.io/ios/app/spo2-watcher/id6756836222) | — | $0.99 | Health & Fitness |
| [SuperAge: Biological Age](https://appshunter.io/ios/app/superage-biological-age/id6751951815) | 4.8 (87) | Free | Health & Fitness |
| [Blood Oxygen SpO₂ Tracker](https://appshunter.io/ios/app/blood-oxygen-spo-tracker/id1533800269) | 3.4 (128) | Free | Health & Fitness |
| [O2 Buddy: Blood Oxygen SpO2](https://appshunter.io/ios/app/o2-buddy-blood-oxygen-spo2/id6751239297) | 4.6 (46) | $0.99 | Health & Fitness |

## More apps by Kevin Edwards

- [Just A Day](https://appshunter.io/ios/app/just-a-day/id6757370153)

All apps by Kevin Edwards: https://appshunter.io/developer/1836835800

## Related topics

[spo2 monitor](https://appshunter.io/ios/topics/spo2-monitor) · [spo2](https://appshunter.io/ios/topics/spo2) · [blood oxygen spo2 tracker](https://appshunter.io/ios/topics/blood-oxygen-spo2-tracker) · [blood oxygen watch](https://appshunter.io/ios/topics/blood-oxygen-watch) · [apps for blood oxygen monitoring](https://appshunter.io/ios/topics/apps-for-blood-oxygen-monitoring)

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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 2026-09-10.*