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Fitbit OS 5.1 delivers enhanced health capabilities and convenience features for Sense and Versa 3 smartwatch users

This post was originally published on the Fitbit press site. It has been adapted from its original format.

Picture of fitbit OS 5.1.

Fitbit today announced the availability of its OS 5.1 software update, which expands on its existing health capabilities and brings new convenience features to Fitbit Sense and Fitbit Versa 3. This update provides more ways to track SpO21 so users can better manage their wellbeing and delivers enhanced on-device voice-enabled capabilities with the availability of Google Assistant in the U.S., Bluetooth calling (requires more frequent charging) and audible replies for Alexa users2.

“As we head further into the flu season amidst the ongoing COVID-19 pandemic, keeping an eye on changes to your day-to-day health metrics is more important than ever,” said James Park, co-founder and CEO of Fitbit. “Fitbit Sense and Versa 3 are Fitbit’s most innovative devices yet and can play an important role in making new information available about your physical and mental health and wellbeing. We’re empowering you with the tools you need to better understand and take control of your health and wellness.”

Looking at your SpO2 trends in the Health Metrics dashboard3 may help you see when there are important changes in your fitness and wellness, like increased stress or fatigue, or signs of respiratory issues or changes in your environment, such as altitude or air quality. By tracking your SpO2 levels over time, you can see when there may be important changes in your fitness and wellness.

Fitbit has enhanced its SpO2 experience, enabling Sense and Versa 3 Premium members to track blood oxygen levels while sleeping and see their average in the Fitbit app without using a specific SpO2 clock face. For those who prefer to see their nightly SpO2 levels at a glance on their wrist, Fitbit still has its free signature SpO2 clock face, and will offer seven additional new SpO2 clock faces in the app gallery by the end of the year. Since its launch in September, Fitbit’s signature SpO2 clock face has had more than one million downloads from the Fitbit app gallery.

Video title: Oxygen saturation (SpO2), simplified by Fitbit

More convenience and connectedness, right from the wrist

In addition, Fitbit is elevating the on-device experience by offering even more everyday convenience, turning its smartwatches into devices you can’t live without. Starting today, Fitbit is delivering a choice of voice assistants with the launch of Google Assistant in the U.S.,4 so you can start a yoga exercise in your living room, check the weather forecast before stepping out for a walk, set an alarm or check your sleep duration, and even control your smart home devices5 – all from the wrist with the touch of a button (when your phone is nearby). Google Assistant will roll out to additional markets, including Australia, Canada, India, Ireland, New Zealand, Singapore and the U.K. in English in late 2020.

With Alexa, you have the added capability to receive audible replies from the on-device voice assistant, making it easier than ever to stay connected. Fitbit plans to make audible replies available for Google Assistant in the first half of 2021 as it continues to explore more features to bring even more convenience on-the-go.

With both Sense and Versa 3, you’ll also be able to take hands-free Bluetooth calls (requires more frequent charging) with the on-device microphone and speakers, send incoming calls to voicemail and control volume without reaching for a phone – so when you’re taking the dog on a walk around the neighborhood or getting curbside pick-up for groceries, you won’t miss a beat. Android users can also respond to text messages on-the-go with voice-to-text commands.

More content and motivation with Fitbit Premium

To complement the exciting Sense and Versa 3 software updates, Fitbit continues to offer expanded features and content for Fitbit Premium members. Over the last several months, Premium has broadened its offering with workouts from celebrity influencers like Ayesha Curry and delivered more motivational tools such as guided programs and activity challenges to help support you in reaching your unique health goals. With more than 500,000 paid subscribers, Premium recently expanded to a total of 18 languages, including Dutch, French, German, Italian, Japanese, Korean, Spanish and Swedish, increasing the potential for even more Fitbit users around the world to benefit from the service.


Fitbit Sense and Fitbit Versa 3 are available on and online at select retailers.

The rollout of Fitbit’s OS 5.1 software update starts today.

Beginning November 22, will offer Black Friday deals to make these and other devices like the newest tracker, Fitbit Inspire 2, more accessible for more people around the world so you can inspire health this holiday season.

More Information


Users can now run SpO2 in the background and track in the Fitbit mobile app; no clock face required. Not available in all markets. The SpO2 feature is not intended to diagnose or treat any medical condition or for any other medical purpose. It is intended to help you manage your well-being and keep track of your information.


Voice assistant availability and features may vary, see


The Health Metrics dashboard and the metrics displayed in the dashboard are not available in all countries and may require a Premium subscription. Breathing rate, resting heart rate and heart rate variability Health Metrics are available with Fitbit Charge 3, Fitbit Charge 4, Fitbit Inspire 2, Fitbit Inspire HR, Fitbit Ionic, Fitbit Alta HR, Fitbit Versa family and Fitbit Sense devices; SpO2 and skin temperature available with Ionic, Fitbit Versa family and Fitbit Sense devices only. This feature is not intended to diagnose or treat any medical condition or for any other medical purpose. It is intended to help users manage their wellbeing and keep track of their information.


Launching in the United States today. Voice assistant availability and features may vary, see


Third-party account and app may be required. Compatible smart home devices only.

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