Boost your
Apple Watch

Track hydration and body composition on your Apple Watch with AURA Strap.

Delivery within the USA takes 6-8 days.
Check delivery times for other countries here.
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The estimated delivery date for each shipment is based on your location. The average delivery takes from 7 to 20 days.

Body composition

Bioimpedance analysis allows AURA Strap to measure fat and muscle mass in your body



It is important to stay hydrated. AURA Strap allows you to track your hydration levels anytime


App for Apple Watch and iPhone

Companion app will help you to understand measured data and set new goals


Long life on single charge

AURA Strap run up to 6 months on a replaceable coin battery if you're doing measurement every day

Know your body

You can make a series of measurements day-by-day after a workout and get a trend of your body transformation in the app history.

Bioimpedance is the breakthrough, state-of-the-art technology behind AURA Strap. It is the only way to truly understand how your body changes over a day. Body composition analysis decomposes your body into four components: fat, muscle mass, minerals, and body water. You can get more from your fitness activity because you'll know how it affects your body.


Constant body composition tracking will make your workouts and fitness activity much more interactive because you'll see how your body is changing.


Your goals

With AURA Strap you can precisely track your body changes and achieve fitness goals. For example, if you want to become stronger, you can just set a target numerical goal in AURA App, like to gain 7 pounds of muscles during a month and lose 4 pounds of fat, monitor your body composition every day and track your progress.

This way you will know which workouts or activities fit your body better. It will help you achieve your goal faster.


Bioelectrical impedance vector analysis

Bioelectric Impedance Vector Analysis (BIVA) is a graphic display that was developed for a better body impedance interpretation. It presents coordinate systems with tolerance zones for the graphic display of body impedance with hydration, fat, and muscle mass indices.

AURA Devices conducts this analysis and presents its results on display in addition to the traditional display of BIA numerical values, percentile curves, and bar graphs. Our system will help you to understand how your body changes after every single measurement.



Our bodies are about 70% water. So it makes sense that one of the most important things related to your health is hydration. Water gives us mineral elements and even more critical, electrolytes. With AURA Strap, you can monitor hydration levels every day or every hour (or even more frequently if you want).

You can get dehydrated and not even know, as our body does not necessarily signal us about it. AURA Strap tells you when to drink a glass of water based on your activity data and your body hydration levels.


Your data in one app

AURA App safely & securely keeps all fitness data with easy access for the user.

Your goals
Bioelectrical impedance analysis
Your data in one app

Easy to use


Open AURA App on your Apple Watch

Supports any Apple Watch from Series 1 or later.


Push-button on the Strap

The device works up to 6 months on a single replacement battery.


Touch electrodes

This creates a circuit and the measurement will start.


Wait for 30 seconds

It needs to get stable data about active and reactive resistance of your body.


Get the result

You can now view all the data on the companion app on your Watch and iPhone.


As seen on


Aura squeezes its fitness band into an Apple Watch 'Smart Strap'

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If you’re looking for more comprehensive readings, then you might be interested in the Aura Strap which will be able to enhance your Apple Watch experience

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It's not a smartwatch, but this add-on band for the Apple Watch could bring some seriously impressive skills to your wristy companion

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Apple Insider

Apple Watch already does a lot between measuring your steps, workouts and heart rate. That doesn't mean there aren't any health metrics left to measure. Enter, Aura Strap!

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  • Features

    Fat / Muscle measurement
    Hydration level tracking

  • In/Out

    Ultrasound interface for connection to Apple Watch

  • For everyone

    Stainless steel contacts of unique form for hairy and dry hands
    Adjustable nylon straps for any wrist

  • Up to 6 months of hard work

    Single standard, replaceable watch battery (CR2025) included
    High water resistance

  • Syncs with your favorite Watches

    Supports Apple Watch Series 1 or newer and HealthKit
    Companion app for Apple Watch and iPhone



  • Package


    • AURA Strap
    • Coin battery (CR2025 type)
    • Screwdriver for battery replacement
    • Quickstart Guide


Choose your Size

AURA Strap works both with 38/40 mm as well as 42/44 mm Watches. Get yours right now!

Buy for $119

AURA Strap measures your body composition and hydration levels on your Apple Watch.

AURA Strap supports Apple Watches Series 1 or newer, and it connects with 38/40 and 42/44 mm Watches.

A series of day-by-day measurements provides a trend of your body composition changes. It makes your workouts more efficient because you can understand (by numbers) what exercise is definitely good or bad for you.

Yes, AURA Strap measures how much water you have in your body with the help of bioimpedance analysis.

AURA Strap comes in two sizes for 38/40 mm and 42/44 mm Apple Watches. Small AURA Strap fits 144 - 200 mm wrists in circumference and bigger one fits 150 - 225 mm wrists.

Yes, AURA Strap is water resistant. You can wash your hands, go to shower and even swim with your device.

Electrodes on each side of the device are made of medical stainless steel (contains nickel).

AURA Strap works up to 6 months on a standard, replaceable wristwatch battery (CR2025). Then you change it with the included screwdriver, and it's ready to use.

No, we don't recommend using the device with a pacemaker.

AURA Strap uses high-frequency sound to transfer measured data. We use a microphone on Apple Watch to receive all the parameters. AURA app only uses it during the measurement and doesn't store or process the sound data for other needs.