FAQ Bionny 4.0

Bionny 4.0 is a screenless smart band paired with the Bionny app. It tracks your heart rate, stress, sleep, workouts and more, day and night. It also provides blood pressure estimates and helps you understand your habits through easy-to-read scores. It is a wellness tracking tool, not a medical device.

It’s designed to be discreet and comfortable, so you barely notice it on your wrist, even at night. You can view your data in the app whenever you like.

• Heart rate: automatically every 5 minutes, day and night, and continuously during your workouts.
• Resting heart rate and heart rate variability (HRV), measured while you sleep.
• Sleep: duration and stages (light, deep, REM).
• Activity: steps, distance, active calories and workouts.
• Blood oxygen (SpO₂), about once an hour.
• Stress, about every 30 minutes.
• Blood pressure (estimate), automatically throughout the day or on demand.

The app also calculates several scores: Sleep, Recovery, Strain, Cardio Fitness (estimated VO₂ max) and Bionny Age.

Yes. The Bionny app and all its features are included, with no monthly subscription.

Yes, and it's actually recommended: sleep, recovery, resting heart rate and Bionny Age are all based on your nighttime data.

Adults who want to better understand their sleep, activity and day-to-day fitness. No technical skills are required.

The Bionny 4.0 band, its USB charging cable and a quick start guide. Additional accessories depend on the offer chosen when ordering.

Yes, replacement straps are available in the Bionny store. Check the compatibility listed on each accessory's product page.

There's no size to choose: the Bionny band is unisex and adjusts to fit most wrists.

It’s not recommended. The band is designed for the wrist: wearing it on your ankle may make step counts, blood pressure estimates and SpO₂ readings unreliable.

Place the cable's magnetic contacts on the contacts on the back of the band. While charging, a small red light comes on on the sensor. It turns green when charging is complete. A full charge takes about 2 hours, sometimes a little longer.

Yes. On the back of the band, the sensor is protected by a very thin, almost invisible plastic film. Remove it before first use: if it stays on, it will distort all measurements.

• Turn on the band and charge it.
• Install the Bionny app from the App Store or Google Play.
• Turn on Bluetooth on your phone, open the app and create your account.
• Follow the steps to add the band in the app and accept the requested permissions.

You can also check out our Bionny YouTube channel (youtube.com/@getbionny): our video tutorials guide you step by step.

Wear it on your arm, about one finger's width above the wrist bone, toward the elbow, snug but not tight: the sensor should stay in contact with your skin without sliding.

The band needs a few days to calibrate. Several features also compare your values to your own baseline: they become more meaningful after a few nights of wear.

Your age, sex, height and weight are used to calculate your calories, strain, distance and Bionny Age. Fill them in carefully under "Profile", and update your weight if it changes.

The official "Bionny" app, on the App Store or Google Play. Don't use any other app with your band: to avoid interference, it should only be connected to one app and one device at a time.

All iOS and Android phones: iPhone with iOS 13.0 or later, and Android smartphones with Android 8.0 or later.

No, that's not necessary. Always connect the band from the Bionny app, which handles the connection itself. Just make sure Bluetooth is turned on.

No, except during a workout. The band records your data even when the app is closed: it's transferred when you open the app, with Bluetooth on and your phone nearby. During a workout, however, keep the app open, at least in the background, until the workout ends.

Yes. The band keeps recording your data even when your phone isn't nearby, and transfers it at the next sync. For workouts, however, keep your phone with you for the best accuracy.

It stores your data for several days, but not indefinitely. To avoid losing anything, open the app at least every few days, ideally every day.

The band sends its data each time it syncs. So it's normal for some values, like steps or strain, to jump suddenly when you open the app.

The band communicates with the app via Bluetooth, without internet. A connection is required to create your account, sign in and back up your data.

Yes. Install the app on your new phone, sign in with the same account, then add your band. Your recorded data is kept in your account. You should then delete the app from your old phone.

No. An account can only be linked to one band at a time.

Yes, since the November 1, 2026 update. Bionny can send your data (steps, active calories, workouts, sleep, resting heart rate and HRV) to Apple Health on iPhone and to Health Connect on Android. Turn on syncing in the app settings.

Yes. From your profile in the app, you can export your health data in CSV format.

From the App Store or Google Play. Turn on automatic updates to get improvements as soon as they're released.

Under "Profile", tap "Rate Bionny": you'll be taken to the App Store or Google Play review page. Your feedback really helps us.

An optical sensor on the back of the band analyzes the light reflected by your skin to detect your pulse. It measures it automatically every 5 minutes, day and night, and continuously during your workouts. You can also start a measurement at any time from the app.

It's your heart rate when your body is completely at rest. Bionny measures it while you sleep. It's one useful indicator of your fitness: a lower value generally reflects a more efficient heart.

Heart rate variability is the variation in time between heartbeats. Bionny measures it mainly at night. HRV varies considerably between people, so compare it with your own usual values rather than someone else’s. A higher-than-usual HRV can be associated with better recovery.

It's the percentage of oxygen carried by your blood. Bionny estimates it about once an hour, mainly at rest and during sleep. For most healthy people, it's between 95 and 100%. Look at the trend rather than a single value.

Bionny estimates your blood pressure using its optical sensor, without a cuff. It generates estimates automatically throughout the day, and you can also request one at any time in the app. Results may differ from those of a validated cuff monitor, which should be used for medical blood pressure monitoring.

Start the measurement yourself, seated, after resting quietly for a few minutes, without talking or moving, with your arm resting at heart level. Automatic measurements taken while you're moving are less reliable.

The band estimates your stress level about every 30 minutes, using its heart sensor. The lower the score, the calmer your body.

The band uses your movements and heart rate during the night to estimate how long you sleep and your sleep stages (light, deep, REM). These estimates are more meaningful over several nights than over a single one.

It reflects the quality of your night, based on the duration, continuity and regularity of your sleep.

It's calculated from your overnight HRV and resting heart rate, compared with your usual values, as well as your sleep and the previous day's strain.

It measures the effort your body puts in during the day, from 0 to 100%, based on the time spent with an elevated heart rate and your steps.

It's an estimate of your endurance, calculated from your age and resting heart rate.

It's an estimate based on your data, to compare with your actual age to see the effect of your habits. It's a wellness indicator, not a medical age.

After about three weeks of wearing the band day and night. It's then updated every two weeks.

The band counts steps from your arm movements, while your phone counts them from your body movements. If you walk with your hands in your pockets, carrying a bag or pushing a stroller, the band may count fewer steps.

A band that's too loose, the protective film still on the sensor, movement, tattoos, sweat, cold hands, or a band worn too close to the wrist bone can all distort measurements.

In the app, open "Activity", choose your sport and start the workout. During the workout, the band measures your heart rate continuously. Stop the workout yourself at the end to save it.

It's best to. The band communicates with your phone via Bluetooth, which has a range of about 10 meters (33 feet). For outdoor walking, running or cycling, the distance and route also come from your phone's GPS.

Yes, the workout continues in the background. Just avoid fully closing the Bionny app (by swiping it off the screen) before you've stopped the workout.

Outdoors, the distance for walking, running or cycling comes from your phone's GPS. If your phone isn't with you, or for team and racket sports (soccer, tennis, padel…), it's estimated from your steps, height and cadence.

Depending on the sport, from your heart rate during the workout or the typical intensity of the activity, along with your profile (age, sex, weight). For walking, they depend on your speed. It's an estimate: keep your weight up to date for a more accurate result.

Yes. You can delete a workout, and the day's data is recalculated automatically. For a workout recorded by the band, the measurements (duration, distance, heart rate) stay locked so they remain true to what was measured.

No. Bionny is intended for general wellness. It cannot diagnose, prevent, monitor or treat any disease. Never change a treatment based on its results.

No. Bionny's blood pressure estimates are not validated for medical use. To monitor your blood pressure, use a validated cuff blood pressure monitor and follow your doctor's advice.

No. A normal value doesn't rule out a health problem, and an unusual value is not a diagnosis. If you have symptoms, see a healthcare professional without waiting for a result from the app.

Take off the band, clean it and let your skin rest. Put it back on less tightly, on clean, dry skin. If the irritation persists, see a healthcare professional. A fabric strap may suit sensitive skin.

Up to 30 days with full use, and up to 45 days with light use. Workouts, manual measurements and notifications reduce battery life.

Frequent workouts, lots of notifications and manual measurements use more power. Also make sure the app is up to date.

Bionny has an IP68 water-resistance rating. This rating describes resistance under specified test conditions; it does not, by itself, confirm suitability for swimming. Check the product’s water-use instructions before wearing it in the shower or while swimming. Avoid saunas and steam rooms, and never charge the band while it is wet.

Regularly wipe the band and the sensor with a soft, slightly damp cloth, with mild soap if needed. Dry it thoroughly before wearing or charging it. Avoid solvents and harsh products. You'll also find our tutorials on our YouTube channel: youtube.com/@getbionny.

Store the Bionny 4.0 in a dry place to preserve the battery. Do not expose the bracelet to extreme temperatures (below -10°C or above 60°C).

Make sure the band is charged, Bluetooth is turned on and the app is up to date. Check that it isn't connected to any other app or phone, then add the band again from the Bionny app.

The Bionny app only recognizes official Bionny bands purchased from our official store. If your band isn't recognized, contact our customer service with your order number.

Keep your phone nearby and allow the app to run in the background:

• On Android: in your phone's settings, open Apps > Bionny > Battery and choose "Unrestricted" (or turn off battery optimization). On some phones (Samsung, Xiaomi, OPPO…), also allow auto-start.
• On iPhone: in Settings > Bionny, turn on "Background App Refresh".

Bring your phone closer to the band and keep the app open for a few moments. If you haven't opened it for several days, the first sync may take longer, because the band sends all the data recorded in the meantime. If it's still slow, use the "Clear cache and reload" option in the "Device" section of the app.

Make sure you wore the band all night, snug and charged, then open the app to sync. The sleep score requires at least 3 hours of sleep: below that, the night is recorded but no score is calculated.

Long periods lying still (in front of the TV, for example) can sometimes be mistaken for sleep, and a band that's too loose may miss some stages. Compare trends over several nights rather than just one.

Make sure your app is up to date and that your band is used with only one account, on one phone and with one app: Bionny. Check that you have removed the protective film from the sensor. Request a manual estimate, then check over the following hours whether automatic estimates appear. If the issue continues, contact us and tell us your phone model.

Calls and text messages, as well as notifications from many apps: WhatsApp, Instagram, Messenger, Facebook, Telegram, Snapchat, X, LinkedIn and more. Choose the apps you want in the Bionny app settings.

Make sure notifications are turned on in the Bionny app and in your phone's settings, that Bluetooth is connected and that "Do Not Disturb" mode is off. On Android, allow notification access for the Bionny app. On iPhone, turn on notification sharing for the band in the Bluetooth settings.

The band vibrates when you get a call and lets you decline it, but you can't talk or make calls with it.

Close and reopen the app, restart your phone and check whether an update is available. If the problem continues, report it from "Help & Feedback" in the app.

In the "Device" section of the app, use "Restart" or "Reset". Note: a reset erases any data that hasn't been synced yet. Sync your data first.

Charge it with the original cable, making sure the contacts are properly aligned: the red light should come on on the sensor. Let it charge for at least 2 hours. If nothing happens, contact our customer service.

Only from our official stores, getbionny.com and bionny.com. Beware of offers from unauthorized sellers on marketplaces: these products are not official Bionny products and are not recognized by the app.

The available payment methods are shown at checkout and may vary depending on your country. Payments are processed by specialized providers over a secure connection. Never share your banking details by email or message.

Orders ship within 24 to 48 hours maximum. You'll receive an email with your tracking number as soon as it ships: be sure to check your spam folder.

Allow 4 to 6 business days after shipping. Delays are possible during periods when carriers are especially busy, such as Black Friday, Christmas or sales seasons.

Email us as soon as possible at contact@getbionny.com with your order number. Changes are no longer possible once the order has shipped.

Check the tracking, your address and any delivery notice. If the problem persists, contact us at contact@getbionny.com with your order number.

Keep the packaging, take photos of the contents and the label, then email us at contact@getbionny.com with your order number.

It depends on your delivery country. If a carrier asks you for an unexpected payment, contact us before paying.

Follow these steps:

• Basket: Check your selection
• Information: Enter your delivery and billing address
• Payment: Choose your payment method and get a summary (price, options, delivery type)
• Confirmation: The order is confirmed, you can print it or receive it by email with the order reference

We place particular importance on the security of your payments and the reliability of our services:

• 100% secure online payments via Stripe (SSL bank certification)
• Encrypted data: All your information is protected
• Responsive and competent customer service
• Thousands of customers already trust us

This may be due to:

• Incorrect information: Check all details (card number, name, surname, CVV, expiry date)
• Insufficient balance
• Blocked card: Contact your bank

We use SSL 256-bit encryption for all transactions. Your bank details are never stored on our servers. Our payment platform (Stripe) benefits from security equivalent to that of banks.

We work with several trusted carriers: UPS, DHL, Fedex, Colissimo, Royal Mail, Hermès.

Not yet. Currently, we offer only one standard delivery option. Express options may be added soon.

Yes. Return conditions follow the regulations in force in your country of purchase (European Union, United States, Australia…). In the European Union, for example, you have 14 days after receipt to exercise your right of withdrawal. See our return policy for the applicable conditions.

Email us at contact@getbionny.com with your order number. Wait for our instructions and the return address before sending the product back.

As soon as your return has been received and checked, to the payment method used for the order, within the time limits set by law.

Your Bionny is covered by the legal warranty provided by the regulations in force in your country of purchase. You can extend it with our commercial warranty extension, Bionny+.

Bionny+ is our commercial warranty extension, offered as an option at purchase. It comes in addition to the legal warranty and does not replace it. Its duration, price and terms are specified when you order.

First try the solutions in the Troubleshooting section, then contact us at contact@getbionny.com with your order number, a description of the problem and, if possible, photos or a video.

Before initiating a return, please check that your item meets the following criteria:

• Item in excellent condition: Not worn, in original packaging
• Original packaging: The product must be returned in its intact original packaging. Original packaging is essential and mandatory to exercise your right of withdrawal.

My item has a defect: In case of a problem with a received item, please contact us immediately. If the item is damaged or defective, we will review your request and follow the instructions according to our return policy.

Your measurements are recorded by the band, then synced with the app and securely backed up to your account, so you can find them again if you change phones.

Yes. Your data is protected and is never sold. See our privacy policy to learn more.

Yes. For any request to access or delete your data, contact us using the details provided in our privacy policy.

• For an order, delivery or return: email contact@getbionny.com with your order number.
• For a problem with the app or the band: open the Bionny app, then "Help & Feedback". Describe the problem, attach a screenshot if possible and include your order number for better follow-up.

We usually respond within 1 to 2 business days.