CIRCUL+

CIRCUL+

First generation ring

36 ratings
17 reviews
Free

Details

  • Released
  • Updated
  • January 15, 2020
  • January 23, 2026

Features

CIRCUL+ screenshot #1 for iPhone
CIRCUL+ screenshot #2 for iPhone
CIRCUL+ screenshot #3 for iPhone
CIRCUL+ screenshot #4 for iPhone
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About

This utility app connects to a wearable device to monitor vital health metrics like oxygen saturation, heart rate, and sleep patterns. It generates health reports and syncs data with Apple Health, offering insights into your well-being.

Bluetooth connectivity
Daily, operation, and sleep monitoring
Blood pressure monitoring (latest ring)
Health data synchronization with Apple Health
Step counting integration
Health report generation
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What's New in CIRCUL+

1.64

January 23, 2026

Enable HRV compatibility with firmware version 6.0

User reviews

Best device for SpO2

I’ve looked extensively and I think this is the best device for continuously measuring SpO2 - it provides more granular data than Oura

Syncing with Health

The app is nice; however, it would be better if I could explore the data either via a data export or a cursor, like the o2vibe app had, and if it would send all data to Apple’s Health App. Some of the data are there, but most are not. Of course, the issue could be on Apple’s end, but this shortcoming is disappointing, as the app’s ability to sync with Apple’s Health suite was a critical part of my decision to purchase the Circul+ ring.

Edit: I decided to lower my rating, because the Sleep Report will give a lowest SpO2 value, but this value does not appear on the chart/graph, meaning I cannot tell *when* this dip occurred, which is critically important information (i.e., I need to be able to ascertain if the dip occurred when I got out of bed and walked around or while I was asleep).
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Syncing with Health

The app is nice; however, it would be better if I could explore the data either via a data export or a cursor, like the o2vibe app had, and if it would send all data to Apple’s Health App. Some of the data are there, but most are not. Of course, the issue could be on Apple’s end, but this shortcoming is disappointing, as the app’s ability to sync with Apple’s Health suite was a critical part of my decision to purchase the Circul+ ring.
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So far so good

I have chronic apoxemia due to other factors but I needed something to accurately measure my o2 stats continuously and alarm me when they fall. It’s doing that but I don’t always get the alarm and not sure why. It seems to be reasonably accurate. Charging is clumsy and hope that is improved.

Not worth the price

4 out of 5 readings come back as failures

Developer apps

FAQ

What health data does CIRCUL+ track?

CIRCUL+ tracks oxygen saturation, sleep, body temperature, heart rate variability (SDNN), diastolic blood pressure, systolic blood pressure, resting heart rate, and heart rate. The latest ring model also monitors blood pressure.

How does CIRCUL+ sync with Apple Health?

Data generated by the CIRCUL+ ring, including oxygen saturation, sleep, body temperature, and various heart metrics, is saved to Apple Health. Daily step counting also supports access to Apple Health data.

Can CIRCUL+ be used without the wearable device?

No, the application is designed to be used in conjunction with the CIRCUL+ wearable device to monitor health metrics and generate reports.

Is CIRCUL+ suitable for making medical decisions?

No, users are advised to consult their doctor for medical advice before making any medical decisions, even when using this application.

What is the update frequency for CIRCUL+?

The app was last updated on January 23, 2026, with version 1.64. Further update frequency information is not provided.

What devices are compatible with CIRCUL+?

CIRCUL+ is supported on iPhone, iPad, and iPod devices. It requires a Bluetooth connection to the CIRCUL+ ring.

What is the age rating for CIRCUL+?

CIRCUL+ has an age rating of 12+, indicating it is suitable for users aged 12 and above.

What are users saying about CIRCUL+?

CIRCUL+ has an average rating of 3.3 stars from 36 ratings. Specific user sentiment details are not provided.