SPO2er: Blood Oxygen on Watch

SPO2er: Blood Oxygen on Watch

SPO₂ Monitoring from HealthKit

6 ratings
4 reviews
#122 in paid Health & Fitness
🌟 Lifestyle
💪 Health & Fitness
$0.99

Details

  • Released
  • Updated
  • December 1, 2025
  • January 4, 2026
SPO2er: Blood Oxygen on Watch screenshot #1 for iPhone
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About

Visualize your blood oxygen levels with clear graphs and historical data. This app syncs with HealthKit to display your latest readings, 24-hour trends, and past samples on your iPhone and Apple Watch. It prioritizes privacy with no accounts, ads, or data sharing.

Latest blood oxygen reading display
24-hour trend graph
Detailed historical samples
Apple Watch complications
Customizable low value highlighting
iPhone and Watch synchronization
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What's New in SPO2er

1.2

January 4, 2026

• 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.

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Charts

Top Paid

📉 122-3

Health & Fitness

This app dropped -3 positions in Health & Fitness chart.

Last updated on August 1, 2026.

User reviews

Working as expected.

Complication now showing and performing as expected.

Response from developer

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.

Apple Watch 10 Complication

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

Complication doesn’t show up.

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.
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Better than Vitals

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.

Developer apps

FAQ

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.