How Can I Tell Which Fitbit I Have?

3 Quick Ways to Identify Your Fitbit Model

Fitbit has released dozens of devices over the years, and many of them look similar. If you're trying to figure out which model you have (to buy a replacement band, check compatibility with an app, or look up the right manual), there are three reliable methods you can use right now.

The fastest is usually the Fitbit app on your phone. If you have the app installed and your device is paired, your model name is displayed right in the account section. If you don't have the app available, you can check the device itself for markings, or look at the serial number on the back of the tracker and cross-reference it against Fitbit's model list.

Key Takeaways

The Fitbit app is the easiest way to identify your model: open the app, tap your profile picture, and select your device.
The device name is often printed or engraved on the back of the tracker or on the original packaging.
Your model number appears on the serial number sticker and can be cross-referenced with Fitbit's support site.

Method 1: Check the Fitbit App

This is the fastest method if your Fitbit is paired and syncing.

Open the Fitbit app on your iOS or Android phone.
Tap your profile picture or avatar in the top-left corner of the Today tab.
You'll see a list of your paired devices. The name shown next to each device icon is your Fitbit model (for example, "Fitbit Versa 4" or "Fitbit Charge 6").

If you have multiple Fitbit devices paired, they'll all appear in this list with their full model names. Tap any device for more detail, including firmware version and battery level.

This method works for all Fitbit models that are connected to the app. If your device isn't paired or the app isn't installed, use one of the methods below instead.

Method 2: Check the Device Itself

Most Fitbit trackers have the model name or number printed or engraved somewhere on the physical device.

On the back of the tracker: Look for text engraved into the housing. Many Fitbit models print the device name on the back (e.g., "Charge 5" or "Inspire 3"). The text is often small and may require good lighting to read.
On the original box: If you still have the original packaging, the model name is clearly printed on the front and sides of the box.
On the charging cable or dock: Some Fitbit charging accessories are model-specific and may have the model name printed on them or on the associated packaging.

Note that the physical device markings show the model name as Fitbit labeled it (e.g., "Versa 4"), which is exactly what you need when buying accessories or looking up compatible features.

Method 3: Check the Serial Number

Every Fitbit has a unique serial number that encodes information about the model and manufacturing date. You can find it in two places:

In the Fitbit app: Go to your profile, tap the device, and scroll down to find "Serial Number" in the device details.
On the device: The serial number is typically laser-etched on the back of the tracker, sometimes under the band clasp. You may need to remove the band to see it clearly.

Once you have the serial number, you can enter it on Fitbit's support site (fitbit.com/support) using the "Find my product" tool to confirm your exact model and purchase date. This is useful if you're registering the device for warranty purposes or need to verify the model for a return.

Current Fitbit Models at a Glance

If you're looking at your device and trying to match its appearance to a model name, here's a quick reference for Fitbit's main product lines as of 2026:

Fitbit Charge 6: Slim rectangular tracker with a touchscreen. The most recent Charge model, featuring Google Maps, YouTube Music controls, and Google Wallet.
Fitbit Versa 4: Square-ish smartwatch with a color touchscreen, thicker profile than the Charge. Supports Alexa and Google Assistant.
Fitbit Sense 2: Similar form factor to Versa 4 but adds EDA (electrodermal activity) sensor for stress tracking.
Fitbit Inspire 3: The slim, entry-level band. Smaller and thinner than the Charge, no built-in GPS.
Fitbit Luxe: A slimmer fashion-forward band with color screen, positioned between Inspire and Charge in features.
Fitbit Ace 3: Kids tracker with a simpler interface and durable design.

If your device doesn't match any of the above, it's likely an older model. Common older Fitbits include the Charge 5, Charge 4, Versa 3, Versa 2, Alta HR, Blaze, Ionic, and original Charge HR. Fitbit's support site maintains a full archive of all models with photos if you need to match an older device.

What to Do Once You Know Your Fitbit Model

Once you've confirmed your model, a few things become easier:

Buy the right replacement band: Fitbit bands are not universal. The Charge 6 uses a different pin size than the Versa 4. Knowing your exact model prevents buying incompatible accessories.
Check feature compatibility: Features like built-in GPS, ECG, EDA, SpO2, and Google Wallet are model-specific. Your model name tells you exactly what your device can and can't do. For a deeper dive, our guide on what Fitbit measures covers health tracking capabilities by model.
Connect to the right apps: Some third-party apps only support certain Fitbit models. Our roundup of the best apps to use with Fitbit notes which features require which hardware.
Pair with a productivity app: Once you know your model and its health data capabilities, you can connect it to tools that put that data to work. Lifestack integrates with Fitbit to read your sleep and activity data, then uses it to schedule your tasks at your peak energy times automatically. It's one of the more practical ways to turn your Fitbit data into something that actually changes how your day runs.

Fitbit Model Identification FAQ

How can I tell which Fitbit I have without the app?

Look at the back of the device for engraved text showing the model name. Alternatively, check the original box or the charging cable packaging if you still have them. The serial number on the back of the device can also be used to look up the exact model on Fitbit's support website without needing the app.

Where is the model number on a Fitbit?

The model number is typically laser-etched on the back of the device alongside the serial number. It may be under the band clasp and require removing the band to read. In the Fitbit app, go to your profile, tap the paired device, and scroll down to find detailed device information including the model name and serial number.

How do I find my Fitbit serial number?

In the Fitbit app, go to your profile picture, tap the device name, and scroll to the device details. The serial number is listed there. You can also find it physically on the back of the tracker, often under the wristband. The serial number is a string starting with letters like "FB" followed by numbers, and it uniquely identifies your specific unit.

Does changing the Fitbit band change the model?

No. The band is an accessory. The tracker unit itself (the rectangle or square device that attaches to the band) determines your Fitbit model. Swapping to a different style band changes how the device looks but doesn't change any features or software behavior. Just make sure any new band is compatible with your specific model.

How do I know if my Fitbit is too old to update?

Fitbit periodically ends software support for older models. You can check whether your device is still supported by going to the Fitbit app, tapping your device, and looking for any notification about update availability. If no updates are being pushed to the device, check Fitbit's official support page for the end-of-life status of your model. Models that are end-of-life still function but won't receive new features or security patches. Our comparison of current wearables can help if you're deciding whether to upgrade.

Can I use my old Fitbit with the current Fitbit app?

Many older Fitbit models still sync with the current Fitbit app, including models going back several years. However, certain app features may not be available for older hardware. The Fitbit settings guide covers common configuration tasks that apply across most supported models.

3 Quick Ways to Identify Your Fitbit Model

Fitbit has released dozens of devices over the years, and many of them look similar. If you're trying to figure out which model you have (to buy a replacement band, check compatibility with an app, or look up the right manual), there are three reliable methods you can use right now.

The fastest is usually the Fitbit app on your phone. If you have the app installed and your device is paired, your model name is displayed right in the account section. If you don't have the app available, you can check the device itself for markings, or look at the serial number on the back of the tracker and cross-reference it against Fitbit's model list.

Key Takeaways

The Fitbit app is the easiest way to identify your model: open the app, tap your profile picture, and select your device.
The device name is often printed or engraved on the back of the tracker or on the original packaging.
Your model number appears on the serial number sticker and can be cross-referenced with Fitbit's support site.

Method 1: Check the Fitbit App

This is the fastest method if your Fitbit is paired and syncing.

Open the Fitbit app on your iOS or Android phone.
Tap your profile picture or avatar in the top-left corner of the Today tab.
You'll see a list of your paired devices. The name shown next to each device icon is your Fitbit model (for example, "Fitbit Versa 4" or "Fitbit Charge 6").

If you have multiple Fitbit devices paired, they'll all appear in this list with their full model names. Tap any device for more detail, including firmware version and battery level.

This method works for all Fitbit models that are connected to the app. If your device isn't paired or the app isn't installed, use one of the methods below instead.

Method 2: Check the Device Itself

Most Fitbit trackers have the model name or number printed or engraved somewhere on the physical device.

On the back of the tracker: Look for text engraved into the housing. Many Fitbit models print the device name on the back (e.g., "Charge 5" or "Inspire 3"). The text is often small and may require good lighting to read.
On the original box: If you still have the original packaging, the model name is clearly printed on the front and sides of the box.
On the charging cable or dock: Some Fitbit charging accessories are model-specific and may have the model name printed on them or on the associated packaging.

Note that the physical device markings show the model name as Fitbit labeled it (e.g., "Versa 4"), which is exactly what you need when buying accessories or looking up compatible features.

Method 3: Check the Serial Number

Every Fitbit has a unique serial number that encodes information about the model and manufacturing date. You can find it in two places:

In the Fitbit app: Go to your profile, tap the device, and scroll down to find "Serial Number" in the device details.
On the device: The serial number is typically laser-etched on the back of the tracker, sometimes under the band clasp. You may need to remove the band to see it clearly.

Once you have the serial number, you can enter it on Fitbit's support site (fitbit.com/support) using the "Find my product" tool to confirm your exact model and purchase date. This is useful if you're registering the device for warranty purposes or need to verify the model for a return.

Current Fitbit Models at a Glance

If you're looking at your device and trying to match its appearance to a model name, here's a quick reference for Fitbit's main product lines as of 2026:

Fitbit Charge 6: Slim rectangular tracker with a touchscreen. The most recent Charge model, featuring Google Maps, YouTube Music controls, and Google Wallet.
Fitbit Versa 4: Square-ish smartwatch with a color touchscreen, thicker profile than the Charge. Supports Alexa and Google Assistant.
Fitbit Sense 2: Similar form factor to Versa 4 but adds EDA (electrodermal activity) sensor for stress tracking.
Fitbit Inspire 3: The slim, entry-level band. Smaller and thinner than the Charge, no built-in GPS.
Fitbit Luxe: A slimmer fashion-forward band with color screen, positioned between Inspire and Charge in features.
Fitbit Ace 3: Kids tracker with a simpler interface and durable design.

If your device doesn't match any of the above, it's likely an older model. Common older Fitbits include the Charge 5, Charge 4, Versa 3, Versa 2, Alta HR, Blaze, Ionic, and original Charge HR. Fitbit's support site maintains a full archive of all models with photos if you need to match an older device.

What to Do Once You Know Your Fitbit Model

Once you've confirmed your model, a few things become easier:

Buy the right replacement band: Fitbit bands are not universal. The Charge 6 uses a different pin size than the Versa 4. Knowing your exact model prevents buying incompatible accessories.
Check feature compatibility: Features like built-in GPS, ECG, EDA, SpO2, and Google Wallet are model-specific. Your model name tells you exactly what your device can and can't do. For a deeper dive, our guide on what Fitbit measures covers health tracking capabilities by model.
Connect to the right apps: Some third-party apps only support certain Fitbit models. Our roundup of the best apps to use with Fitbit notes which features require which hardware.
Pair with a productivity app: Once you know your model and its health data capabilities, you can connect it to tools that put that data to work. Lifestack integrates with Fitbit to read your sleep and activity data, then uses it to schedule your tasks at your peak energy times automatically. It's one of the more practical ways to turn your Fitbit data into something that actually changes how your day runs.

Fitbit Model Identification FAQ

How can I tell which Fitbit I have without the app?

Look at the back of the device for engraved text showing the model name. Alternatively, check the original box or the charging cable packaging if you still have them. The serial number on the back of the device can also be used to look up the exact model on Fitbit's support website without needing the app.

Where is the model number on a Fitbit?

The model number is typically laser-etched on the back of the device alongside the serial number. It may be under the band clasp and require removing the band to read. In the Fitbit app, go to your profile, tap the paired device, and scroll down to find detailed device information including the model name and serial number.

How do I find my Fitbit serial number?

In the Fitbit app, go to your profile picture, tap the device name, and scroll to the device details. The serial number is listed there. You can also find it physically on the back of the tracker, often under the wristband. The serial number is a string starting with letters like "FB" followed by numbers, and it uniquely identifies your specific unit.

Does changing the Fitbit band change the model?

No. The band is an accessory. The tracker unit itself (the rectangle or square device that attaches to the band) determines your Fitbit model. Swapping to a different style band changes how the device looks but doesn't change any features or software behavior. Just make sure any new band is compatible with your specific model.

How do I know if my Fitbit is too old to update?

Fitbit periodically ends software support for older models. You can check whether your device is still supported by going to the Fitbit app, tapping your device, and looking for any notification about update availability. If no updates are being pushed to the device, check Fitbit's official support page for the end-of-life status of your model. Models that are end-of-life still function but won't receive new features or security patches. Our comparison of current wearables can help if you're deciding whether to upgrade.

Can I use my old Fitbit with the current Fitbit app?

Many older Fitbit models still sync with the current Fitbit app, including models going back several years. However, certain app features may not be available for older hardware. The Fitbit settings guide covers common configuration tasks that apply across most supported models.