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Frequently Asked Questions


Which devices is the Circular Ring compatible with?

The Circular ring is compatible with most mobile devices that run iOS 11.0 or later, or Android 6.0 or later.

Where can I download the Circular app?

The Circular app for iPhone will be available on the App Store for devices running iOS 11.0 or later. The Circular app for Android will be available on Google Play for devices running Android 6.0 or later.


How does Circular measure my body signals?

The ring first collects the body signals it needs thanks to its sensors (infrared & red optical pulse sensor & 3-axis accelerometer). The ring contains a built-in processor that will process the data and sends it by Bluetooth to the Circular mobile app for analysis. The Circular app uses machine learning to better understand your habits and offer a personal experience.

How does Circular measure my heart rate?

When your heart beats, your capillaries expand, and contract based on blood volume changes. The optical heart rate sensor (PPG) in your Circular ring flashes its LEDs rapidly on the arteries of your finger’s palm side to detect blood volume changes. Your device calculates the number of times your heart beats per minute (BPM), which is your heart rate.

How does Circular track my sleep?

Circular tracks your sleep thanks to the correlation of the data collected by the HR sensor and the motion sensor. We detect whether or not you are sleeping and in what sleep stage you are. We deduce many other deep factors to improve your sleep in the long term.

Does Circular track my heart rate during exercise?

Yes, Circular tracks heart rate during exercise and many other activities. It automatically detects the activity you are doing. You can also input your activities manually in the in-app calendar.

How does Circular track my heart rate variability?

Circular tracks your heart rate variability (HRV) while you sleep, and during restful moments during the day. It calculates your HRV from the rMSSD, a well-known HRV parameter that provides a good view on your Autonomic Nervous System activity.

How do I get notifications from my phone on my Circular ring?

Your Circular ring can receive notifications to keep you informed by vibration, such as text messages, phone calls, notification from apps and meeting alerts, when your phone is nearby.To receive calendar alerts on your Circular ring, make sure you allow the calendar app on your phone to send notifications. In addition to the Notifications options in the Circular app, you may need to modify settings specific to your phone.For iPhones, your Circular ring shows notifications from all calendars synced to your default Calendar app. Choose from the default Calendar app on your phone or several third-party calendar apps, such as Google calendar.

Your Circular ring does not receive notifications when you turn on airplane mode.

What if I lose my ring? Do I lose my data?

For the very first use, you will have to create an account once the device is paired (if not already signed up via the website). A profile will be created, and all your related data will be stored on an encrypted personal account. That way, if you lose your ring, you’ll still be able to have access to your data and continue with another one, right where you left off.


How do I turn on/off my Circular ring?

It’s so simple that you have nothing to do yourself. There is no on / off button on the ring, it knows when you are wearing it or not and goes into standby by itself if you don't wear it.

Can I put my ring in airplane mode?

Yes, if you prefer to keep Bluetooth off completely, you can enable ring airplane mode to cut all radio transmission from the ring. Circular uses Bluetooth to sync your ring’s data with the app and to send notifications, but it doesn’t need to be connected to your phone to collect your biological data. The ring can store data for up to 1 weeks. Just take your ring out of airplane mode and it will begin syncing all your stored data.

How do I connect my Circular ring to my phone?

Launch your mobile application. The app will ask you to give it permission to access your Bluetooth and then launch the pairing process. Make sure your Circular ring is in pairing mode. To enter pairing mode on your Circular ring, press and hold the button for 5 seconds. the application should detect your ring quickly and connect to it. You will no longer have to perform this process for the future unless you remove the pairing from the ring within the app. The ring can be paired to one device at a time. Don’t worry your data are stored on your personal account and you will have access to all your data on other phones.

Can I wear the ring at the gym?

You can, but to protect your outer-shell, we recommend to wear the outer-shells appropriate for sport. Like regular jewelry, Circular can scratch if worn while lifting weights or gripping bars, or when scraping against metal, ceramics or stone.

Can I wear the ring underwater?

Yes, the ring is water resistant - perfect for washing your hands, showering or even going for a swim (5m deep).

Can I wear my ring during a sauna or in the high mountains?

Yes, absolutely.

What if I don't have my phone with me? Will I lose my data?

The ring uploads data to your phone automatically. If your phone is not available, it can collect and store detailed data for up to 22 days.

Are the waves from the Circular ring dangerous for me?

Although the 800MHz to 2 GHz radiation output of a Bluetooth device is negligible for your health, the Circular ring automatically goes on “sleep mode” when it detects a sleeping state, meaning it is functioning without Bluetooth during your sleep while still capturing your body signals. It will synchronize with the app when you wake up.The Circular ring is a Bluetooth Smart class 2 device. Bluetooth is only active on the ring for short periods of time, well below 1% of the day. Data is transmitted more continuously when the ring syncs with the app, and during firmware updates. Additionally, the Bluetooth signal and advertising are turned off when you’re inactive or sleeping.The limit for SAR (Specific Absorption Rate) for a device such as the Circular ring is 2.0 W/kg for head and body. The Circular ring’s SAR level is 0.0003 W/kg.

How do I charge my Circular ring?

Connect the charger to a USB socket using the supplied USB cable. Simply insert the bottom of the ring (flat part) into the space provided on the charger. The pins of the charger will be in contact with those of your ring so that it can be recharged. A LED on the charger turns on to notify you when the ring charges.


What's included in my ring order?

Every Circular ring order includes the following items:

- The Circular body ring
- The outer-shell(s) of your choice
- A ring charger
- A USB-A to USB-C charging cable for connecting the charger to a power source
- A quick-start guide

What's Circular's return policy?

You may return your fully functional and undamaged Circular product for any reason within 14 days of receipt of your ring for a full refund. Shipping and handling charges are not refundable. For detailed instructions, please see the returns page.

Whatever your questions, suggestions or remarks, our dedicated support team is at your disposal

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