Resources

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Tips, guides and insights to get the most out of your Circular Ring.

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Understanding VO2 max: why is it useful?
Activity

Understanding VO2 max: why is it useful?

July 19, 2022
2 min read
Circular Ring 2: The First and Only Smart Ring with FDA-Cleared ECG
Product Updates

Circular Ring 2: The First and Only Smart Ring with FDA-Cleared ECG

January 15, 2025
7 min read
Introducing Kira: The World First AI Health Coach in a Smart Ring
Product Updates

Introducing Kira: The World First AI Health Coach in a Smart Ring

March 15, 2023
6 min read
How Circular Invented the Silent Vibration Smart Alarm in 2021
Product Updates

How Circular Invented the Silent Vibration Smart Alarm in 2021

November 1, 2021
7 min read
How Circular Became the First Smart Ring to Estimate VO2 Max
Product Updates

How Circular Became the First Smart Ring to Estimate VO2 Max

January 15, 2022
7 min read
Circular Pioneers the First Consumer Smart Ring with SpO2 Monitoring
Product Updates

Circular Pioneers the First Consumer Smart Ring with SpO2 Monitoring

March 15, 2022
6 min read
Can a Smart Ring Detect Sleep Apnea? What the Science Says
Sleep

Can a Smart Ring Detect Sleep Apnea? What the Science Says

June 22, 2026
11 min read
Smart Ring vs Chest Strap: ECG Accuracy Compared
Activity

Smart Ring vs Chest Strap: ECG Accuracy Compared

June 22, 2026
6 min read
Circular Ring 2 vs Samsung Galaxy Ring: Which No-Subscription Smart Ring Is Better?
Product Updates

Circular Ring 2 vs Samsung Galaxy Ring: Which No-Subscription Smart Ring Is Better?

July 8, 2026
8 min read
What Is a Normal Sleeping Heart Rate, and How Do You Measure It?
Sleep

What Is a Normal Sleeping Heart Rate, and How Do You Measure It?

June 26, 2026
7 min read
4 Best Non-Watch Fitness Trackers in 2026
Product Updates

4 Best Non-Watch Fitness Trackers in 2026

June 5, 2026
6 min read
Ultrahuman Ring Pro vs Circular Ring 2: Which is worth buying?
Product Updates

Ultrahuman Ring Pro vs Circular Ring 2: Which is worth buying?

May 20, 2026
6 min read
February 2026 Leaderboard Recap: Top 20 Users & Winner Interview
Product Updates

February 2026 Leaderboard Recap: Top 20 Users & Winner Interview

March 20, 2026
3 min read
5 Best Smart Rings for Women in 2026
Product Updates

5 Best Smart Rings for Women in 2026

April 27, 2026
8 min read
WHOOP vs Circular Ring 2: Which is Right for You?
Product Updates

WHOOP vs Circular Ring 2: Which is Right for You?

April 20, 2026
8 min read
What Makes the Circular Ring 2 Different from Every Other Smart Ring
Product Updates

What Makes the Circular Ring 2 Different from Every Other Smart Ring

April 9, 2026
9 min read
Best Smart Rings Without Subscription in 2026 (Tested & Ranked)
Product Updates

Best Smart Rings Without Subscription in 2026 (Tested & Ranked)

March 31, 2026
6 min read
5 Best Sleep Tracking Devices of 2026: Which One is Worth Your Money?
Sleep

5 Best Sleep Tracking Devices of 2026: Which One is Worth Your Money?

March 11, 2026
7 min read
Circular Ring 2 vs RingConn Gen 2: Which Smart Ring Is Better?
Product Updates

Circular Ring 2 vs RingConn Gen 2: Which Smart Ring Is Better?

March 6, 2026
6 min read
6 Best Ways to Track Your Menstrual Cycle (With Pros and Cons)
Activity

6 Best Ways to Track Your Menstrual Cycle (With Pros and Cons)

February 23, 2026
10 min read
Why Am I So Tired in the Morning? Common Causes and Fixes
Sleep

Why Am I So Tired in the Morning? Common Causes and Fixes

January 21, 2026
15 min read
Hot Flashes During Period: Are they Normal and How to Manage Them?
Activity

Hot Flashes During Period: Are they Normal and How to Manage Them?

January 14, 2026
8 min read
Smart Ring vs Smart Watch: Which is Better?
Product Updates

Smart Ring vs Smart Watch: Which is Better?

January 5, 2026
12 min read
How to Get Over Jet Lag: 8 Pre and Post-Flight Tips
Sleep

How to Get Over Jet Lag: 8 Pre and Post-Flight Tips

October 20, 2025
9 min read
What Is a Smart Ring and How Can It Improve Your Life?
Product Updates

What Is a Smart Ring and How Can It Improve Your Life?

October 15, 2025
10 min read
The Circular Ring 2 Kickstarter Campaign Is Live – A New Era for Personalized Health
Popular

The Circular Ring 2 Kickstarter Campaign Is Live – A New Era for Personalized Health

March 14, 2025
2 min read
Discover the New Coherence Breathing Circle in the Circular Ring
Popular

Discover the New Coherence Breathing Circle in the Circular Ring

August 19, 2024
2 min read
Circular Ring 2 Release Notes (March 2026): 5x Faster Sync, Offline Mode, and Scoring Refinements
Product Updates

Circular Ring 2 Release Notes (March 2026): 5x Faster Sync, Offline Mode, and Scoring Refinements

March 31, 2026
4 min read
14 Best Wellness Gifts for Mom This Mother's Day
Product Updates

14 Best Wellness Gifts for Mom This Mother's Day

May 8, 2026
5 min read
16 Truly Impressive Gifts for the Mom Who Has Everything
Product Updates

16 Truly Impressive Gifts for the Mom Who Has Everything

April 29, 2026
6 min read
Circular Ring Leaderboard: Wellness Score, Rankings and Monthly Prizes
Product Updates

Circular Ring Leaderboard: Wellness Score, Rankings and Monthly Prizes

January 10, 2026
3 min read
Circular Ring 2 Release Notes (Jan 2026): Database Optimization, Server Performance Upgrade, and 2025 Year in Review
Product Updates

Circular Ring 2 Release Notes (Jan 2026): Database Optimization, Server Performance Upgrade, and 2025 Year in Review

January 31, 2026
8 min read
Circular Ring 2 Release Notes (Nov 2025):  Shipping Complete, Infrastructure Evolving
Product Updates

Circular Ring 2 Release Notes (Nov 2025):  Shipping Complete, Infrastructure Evolving

November 30, 2025
3 min read
Circular Ring 2 Release Notes (Oct 2025): Shipping Complete, Customer Support, Firmware Update
Product Updates

Circular Ring 2 Release Notes (Oct 2025): Shipping Complete, Customer Support, Firmware Update

October 31, 2025
3 min read
Circular Ring 2 Release Notes (Dec 2025): Database Migration, App 28.36.0, and Sync Stability Fixes
Product Updates

Circular Ring 2 Release Notes (Dec 2025): Database Migration, App 28.36.0, and Sync Stability Fixes

December 31, 2025
5 min read
4 Best Health Trackers to Wear with a Classic Watch
Activity

4 Best Health Trackers to Wear with a Classic Watch

February 18, 2026
6 min read
Circular Ring 2 Release Notes (Sep 2025): Dedicated Sync Architecture, Faster Data Transfer & Sleep Tracking Improvements
Product Updates

Circular Ring 2 Release Notes (Sep 2025): Dedicated Sync Architecture, Faster Data Transfer & Sleep Tracking Improvements

September 30, 2025
3 min read
21 Gifts for Your Wife: Best Options for Every Type of Woman
Popular

21 Gifts for Your Wife: Best Options for Every Type of Woman

February 6, 2026
12 min read
How to Recover From Burnout: 10 Proven Strategies to Feel Like Yourself Again
Activity

How to Recover From Burnout: 10 Proven Strategies to Feel Like Yourself Again

February 3, 2026
10 min read
10 Thoughtful Valentine’s Gifts for Him (With a Quick Picker by Type)
Popular

10 Thoughtful Valentine’s Gifts for Him (With a Quick Picker by Type)

January 31, 2026
9 min read
How to Fix Shift Work Sleep Disorder: 8 Strategies That Actually Help
Sleep

How to Fix Shift Work Sleep Disorder: 8 Strategies That Actually Help

January 26, 2026
14 min ead
17 Luxury Gifts for Men Who Are Hard to Impress
Popular

17 Luxury Gifts for Men Who Are Hard to Impress

December 24, 2025
15 min read
How to Wake Up Easier: 12 Tips to Beat Grogginess and Start Fresh
Sleep

How to Wake Up Easier: 12 Tips to Beat Grogginess and Start Fresh

December 5, 2025
7 min read
How to Calculate Your Ovulation Window and Know When You’re Most Fertile
Activity

How to Calculate Your Ovulation Window and Know When You’re Most Fertile

November 20, 2025
8 min read
7 Great Breathing Exercises for Stress Relief That Actually Work
Activity

7 Great Breathing Exercises for Stress Relief That Actually Work

November 7, 2025
7 min read
Why ECG is a Game Changer in Circular Ring 2 — And How to Use It Right
Product Updates

Why ECG is a Game Changer in Circular Ring 2 — And How to Use It Right

March 26, 2025
2 min read
How to Use Your HSA or FSA to Purchase the Circular Ring
Product Updates

How to Use Your HSA or FSA to Purchase the Circular Ring

August 27, 2024
2 min read
Circular Partners with Sweatcoin for an Exciting World Wellbeing Week June Challenge!
Product Updates

Circular Partners with Sweatcoin for an Exciting World Wellbeing Week June Challenge!

June 24, 2024
3 min read
NBA Star Clint Capela Joins the Circular Tribe
Popular

NBA Star Clint Capela Joins the Circular Tribe

June 20, 2024
2 min read
Explore Your Health Like Never Before with the Advanced Analytics Circle
Product Updates

Explore Your Health Like Never Before with the Advanced Analytics Circle

June 4, 2024
2 min read
Unleash Your Potential with the New Sport Session Circle
Product Updates

Unleash Your Potential with the New Sport Session Circle

May 28, 2024
2 min read
Beat Sleep Inertia and Wake Up Alert: How Circular's Smart Alarm and Wake-Up Score Revolutionize Mornings
Sleep

Beat Sleep Inertia and Wake Up Alert: How Circular's Smart Alarm and Wake-Up Score Revolutionize Mornings

March 8, 2024
2 min read
Introducing the Medication Reminder Feature in Circular: A Leap Towards a Complete Wellness Ecosystem
Product Updates

Introducing the Medication Reminder Feature in Circular: A Leap Towards a Complete Wellness Ecosystem

February 29, 2024
3 min read
Kira+ Beta: Revolutionizing Personal Health with AI-Powered Coaching
Product Updates

Kira+ Beta: Revolutionizing Personal Health with AI-Powered Coaching

January 26, 2024
2 min read
Stress Levels Tracking: Your Path to Inner Peace
Sleep

Stress Levels Tracking: Your Path to Inner Peace

October 18, 2023
3 min read
Seamless Integration: Circular Ring Now Compatible with Google Fit"
Product Updates

Seamless Integration: Circular Ring Now Compatible with Google Fit"

September 27, 2023
2 min read
Wellness Rewards: Introducing Circular Coins
Product Updates

Wellness Rewards: Introducing Circular Coins

September 24, 2023
3 min read
Unveiling Sleep Secrets: Decoding Your Heart Rate Trend During Sleep with Circular Ring
Sleep

Unveiling Sleep Secrets: Decoding Your Heart Rate Trend During Sleep with Circular Ring

July 28, 2023
3 min
Introducing Kira+: The Most Sophisticated Personalized Wellness AI Powered by Circular
Sleep

Introducing Kira+: The Most Sophisticated Personalized Wellness AI Powered by Circular

July 20, 2023
3 min read
Circular Ring Achieves Seamless Compatibility with Apple HealthKit
Product Updates

Circular Ring Achieves Seamless Compatibility with Apple HealthKit

July 19, 2023
3 min read
Introducing the latest upgrades to Circular Ring: Green LED and Improved Peak Detection Algorithm
Product Updates

Introducing the latest upgrades to Circular Ring: Green LED and Improved Peak Detection Algorithm

May 22, 2023
3 min read
Major Product Upgrade 1
Product Updates

Major Product Upgrade 1

March 16, 2023
5 min read
Leaderboard Winner Interview (Audrey C.) - October 2022
Sleep

Leaderboard Winner Interview (Audrey C.) - October 2022

December 13, 2022
5 min read
New release: Guided Breathing Exercises Circle
Sleep

New release: Guided Breathing Exercises Circle

October 12, 2022
3 min read
Calculate Sleep to Know the Best Time to Go to Sleep
Sleep

Calculate Sleep to Know the Best Time to Go to Sleep

July 27, 2022
8 min read
Average Resting Heart Rate by Age: All You Need to Know
Activity

Average Resting Heart Rate by Age: All You Need to Know

July 27, 2022
10 minutes read
Blood Oxygen: What is a Normal Level
Activity

Blood Oxygen: What is a Normal Level

July 15, 2022
10 min read
Aerobic Exercises: The Best Tips
Activity

Aerobic Exercises: The Best Tips

July 15, 2022
8 min read
Average Body Temperature: All You Need to Know
Activity

Average Body Temperature: All You Need to Know

June 13, 2022
8 min read
Circular Delivery Update #2
Product Updates

Circular Delivery Update #2

June 10, 2022
2 min read
Active Calories vs Total Calories: All You Need to Know
Activity

Active Calories vs Total Calories: All You Need to Know

March 6, 2022
3 min read
Circular Delivery Update #1
Product Updates

Circular Delivery Update #1

May 25, 2022
2 min read
Dive into CBE - Circular’s Brain Engine
Sleep

Dive into CBE - Circular’s Brain Engine

July 4, 2022
5 min read
Recovery Heart Rate: All you Need to Know
Activity

Recovery Heart Rate: All you Need to Know

April 7, 2022
3 min read
Does your oxygen level drop when you lay down?
Activity

Does your oxygen level drop when you lay down?

March 24, 2022
5 min read time
Bio sensors: What is It and How Do They Work?
Sleep

Bio sensors: What is It and How Do They Work?

January 17, 2022
3 min read
Health Data Management: How to Use it To Get Healthier
Activity

Health Data Management: How to Use it To Get Healthier

January 15, 2022
4 min read
Heart Rate Monitor: how to use it?
Activity

Heart Rate Monitor: how to use it?

January 12, 2022
3 min read
How Does a Pedometer Help People Reach Their Fitness Goals?
Activity

How Does a Pedometer Help People Reach Their Fitness Goals?

January 8, 2022
4 min read
The Power of Wellbeing Tracking: Your Guide to a Better Lifestyle
Activity

The Power of Wellbeing Tracking: Your Guide to a Better Lifestyle

January 6, 2022
5 min read
What Is a Pedometer, and How Do You Use One?
Activity

What Is a Pedometer, and How Do You Use One?

January 3, 2022
5 min read
Sleep disorders classification

Sleep disorders classification

November 26, 2019
5 min read
How to adapt to naps

How to adapt to naps

December 19, 2019
2 min read
How to lower your time to fall asleep?

How to lower your time to fall asleep?

September 24, 2019
4 min read
Silent Alarm Clock by Circular® : The perfect smart & silent alarm clock

Silent Alarm Clock by Circular® : The perfect smart & silent alarm clock

May 25, 2022
2 min read
Continuous Heart Rate monitor

Continuous Heart Rate monitor

August 11, 2019
3 min read
Health Metrics: What vital metrics are important to track? And why?
Sleep

Health Metrics: What vital metrics are important to track? And why?

December 22, 2020
5 min read
What’s the Circadian rhythm

What’s the Circadian rhythm

November 7, 2019
2 min read
Circular calibration period: the new way to improved tracking!
Sleep

Circular calibration period: the new way to improved tracking!

March 4, 2021
1 min read
Why it is important to know your Max Heart Rate
Activity

Why it is important to know your Max Heart Rate

December 17, 2019
1 min read
REM sleep is key to your weight loss journey!
Sleep

REM sleep is key to your weight loss journey!

March 7, 2021
1 min read
Respiratory Rate: Why is it useful to track?
Activity

Respiratory Rate: Why is it useful to track?

March 2, 2021
2 min read
Kickstarter campaign - Update #1
Product Updates

Kickstarter campaign - Update #1

February 16, 2020
1 min
The architecture of your sleep. Basics n°4 about sleep

The architecture of your sleep. Basics n°4 about sleep

August 23, 2019
3 min read
Bio-hacking Best Practices from Coach Siim Land
Sleep

Bio-hacking Best Practices from Coach Siim Land

February 25, 2020
3 min
How Circular tracks your Active minutes, Cardio points, Activity Volume, and Recovery
Activity

How Circular tracks your Active minutes, Cardio points, Activity Volume, and Recovery

November 25, 2022
1 min read
The Circular® Global Score, Leaderboard and Streak score
Sleep

The Circular® Global Score, Leaderboard and Streak score

October 12, 2022
2 min read
The Training zone, EPOC and recovery for weight loss: science-backed theory
Activity

The Training zone, EPOC and recovery for weight loss: science-backed theory

December 31, 2019
2 min read
How to change the interchangeable shell of my Circular Ring
Product Updates

How to change the interchangeable shell of my Circular Ring

January 26, 2020
1 min read
Your personal sleep cycle. Basics n°2 about sleep

Your personal sleep cycle. Basics n°2 about sleep

August 11, 2019
1 min read
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Circular Ring 2 vs Samsung Galaxy Ring: Which No-Subscription Smart Ring Is Better?

July 8, 2026
News
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Smart Ring vs Fitness Tracker: Accuracy, Features, and Value Compared

June 30, 2026
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Circular Ring 2 vs Samsung Galaxy Ring: Which No-Subscription Smart Ring Is Better?

July 8, 2026

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2 min read

Silent Alarm Clock by Circular® : The perfect smart & silent alarm clock

May 25, 2022
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Recovery Heart Rate: All you Need to Know

April 7, 2022
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5 min read time

Does your oxygen level drop when you lay down?

March 24, 2022
News
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Circular Pioneers the First Consumer Smart Ring with SpO2 Monitoring

March 15, 2022
Activity
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Active Calories vs Total Calories: All You Need to Know

March 6, 2022
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Bio sensors: What is It and How Do They Work?

January 17, 2022
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The Training zone, EPOC and recovery for weight loss: science-backed theory

December 31, 2019
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Why it is important to know your Max Heart Rate

December 17, 2019
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Rested Heart Rate (RHR): What Increases and Decreases it ?

September 20, 2019
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What is blood oxygenation level or blood saturation (SpO2): Uses and More

August 30, 2019
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3 min read

How Circular tracks your Resting Heart Rate (RHR) and how to use it?

August 30, 2019
Activity
5 min read

How to use Heart Rate Variability (HRV)

August 23, 2019
Sleep
7 min read

What Is a Normal Sleeping Heart Rate, and How Do You Measure It?

June 26, 2026
11 min read

Can a Smart Ring Detect Sleep Apnea? What the Science Says

June 22, 2026
Sleep
2 min read

Beat Sleep Inertia and Wake Up Alert: How Circular's Smart Alarm and Wake-Up Score Revolutionize Mornings

March 8, 2024
News
3 min read

Stress Levels Tracking: Your Path to Inner Peace

October 18, 2023
Sleep
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What is the Circular® Sleep quality score and how it is calculated

August 20, 2023
Sleep
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What is the Circular® Wake up score and how it is calculated

August 3, 2023
News
6 min read

4 Best Non-Watch Fitness Trackers in 2026

June 5, 2026
News
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Ultrahuman Ring Pro vs Circular Ring 2: Which is worth buying?

May 20, 2026
News
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14 Best Wellness Gifts for Mom This Mother's Day

May 8, 2026
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16 Truly Impressive Gifts for the Mom Who Has Everything

April 29, 2026
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5 Best Smart Rings for Women in 2026

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WHOOP vs Circular Ring 2: Which is Right for You?

April 20, 2026

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