Fitbit Technology | PurePulse

Heart Rate

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Unlock the power of PurePulse heart rate

See how our first automatic, continuous wrist-based heart rate technology is helping you understand your heart on a new level.
Woman looking at her watch.
Woman looking at her watch.

Discover the benefits of heart rate tracking

Know your zone

Use heart rate zones to maintain the right intensity.

Track sleep quality

Use your heart rate to track sleep stages.

Reach weight goals

Get a more accurate measure of calories burned.

Manage stress

Do guided breathing sessions personalized for your heart rate.
Heart rate tracking shown on screen
Heart rate tracking shown on screen
Front of watch and sensory on the back of the watch
Front of watch and sensory on the back of the watch
Heart rate tracking shown in the app
Heart rate tracking shown in the app
Heart rate tracking shown on screen
Heart rate tracking shown on screen
In the past, heart rate tracking was expensive, awkward and uncomfortable. With the invention of PurePulse, we made it accessible to anyone. Inspired by a thimble-sized sensor used in hospitals, we conducted extensive research to make wrist-based heart rate tracking work in all types of environments.
Front of watch and sensory on the back of the watch
Front of watch and sensory on the back of the watch
We use light to measure blood flow. As your heart beats, the volume of blood in your wrist rises and falls. Blood absorbs light, so a sensor shines a light onto the skin while light detectors called photodiodes measure how much light is being absorbed. The rise and fall of the absorption signal represents each heartbeat. This tells you how many times your heart is beating per minute.
Heart rate tracking shown in the app
Heart rate tracking shown in the app
In a number of external studies worldwide, PurePulse® technology has surpassed industry expectations. And over 50 patents related to PurePulse technology have been awarded to Fitbit’s heart rate innovation in the process.
Features and tools powered by heart rate
Man sleeping with his watch on
Resting Heart Rate
Measure heart rate when your body’s at rest to assess your heart health and see resting heart rate trends.
Charge 6 screen with Heart Rate zones displayed
Heart Rate Zones
Use real-time heart rate zones to understand your effort during workouts.
Women on a workout bike
Cardio Fitness Level
Better understand how fit you are without the need for a strenuous VO2 max test.
Watch displaying guided breathing
Guided Breathing
Relax anywhere with personalized breathing sessions based on your heart rate.
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    Fitbit launched the first automatic, continuous wrist-based heart rate technology in 2014 with PurePulse.