Find your Fitbit model by checking the device itself

The fastest way to identify your Fitbit is to look at the back of the device. Most Fitbit models have the model name printed directly on the rear case — you may see "Fitbit Charge 5", "Fitbit Inspire 3", "Fitbit Sense 2", or similar text stamped or printed there. Wipe away any dirt or sweat first so you can read it clearly.

If the back is blank or worn, look at the underside of the band or strap. Some models print the name on the removable band itself. You can also check inside the original box or packaging if you still have it — the model name and number appear on the box label and on any documentation that came with it.

Key Takeaways

  • The model name is usually printed on the back of the device or on the removable band.
  • Your Fitbit app on your phone shows the device model in the settings or device information section.
  • The original box, manual, or receipt will list the exact model you purchased.
  • Fitbit's website has a visual guide showing the shape and appearance of each current model so you can match yours by sight.

Check the Fitbit app on your phone

Open the Fitbit app and tap the profile icon (usually in the bottom right corner). Select your device from the list of connected devices. The app will display the full model name, the firmware version, and sometimes a serial number. This method works whether or not you can read the printing on the device itself.

If you have multiple Fitbits linked to your account, the app will list them all. Each one shows its model name clearly. This is also the most reliable way to check if you are unsure whether the printing on the device is accurate or if the device has been worn so long that the text has faded.

Recognize Fitbit models by their shape and screen

Each Fitbit generation has a distinct look. Fitbit Charge models are rectangular with a small rectangular screen and a removable band. Fitbit Inspire models are also rectangular but thinner and lighter, with a smaller screen. Fitbit Sense models are square with a larger, more prominent screen and look more like a smartwatch.

Fitbit Versa models are square and smartwatch-sized with a full-color touchscreen. Fitbit Ace models are designed for children and have a colorful, rounded appearance. Fitbit Flex and Fitbit One are older models — Flex is a thin clip or wristband with a row of small lights instead of a screen, and One is a small clip-on device about the size of a thumb drive.

If you know roughly when you bought your Fitbit, that narrows it down. Fitbit releases new models every one to two years, so a device from 2020 will look different from one from 2023. Comparing your device to photos on Fitbit's official website or product pages will confirm which model you have.

Look up the model number if the name is unclear

Every Fitbit has a model number in addition to its product name. The model number is usually a short code like "FB418" or "FB521" and appears on the back of the device, on the band, or in the Fitbit app under device details. You can search this model number on Fitbit's support website or on the product page to find the exact name and specifications.

The model number is especially useful if you bought a used Fitbit or inherited one and the printing is worn away. Even if you cannot read the product name, the model number will take you directly to the right device page, where you can see the full specifications, compatible bands, and any troubleshooting guides specific to that model.

Check your purchase receipt or order history

If you bought your Fitbit from a retailer like Amazon, Best Buy, or Walmart, log into your account and find the order in your purchase history. The receipt will show the exact model name and number you ordered. If you bought it directly from Fitbit's website, your account there will also show all past orders with model details.

This method is most useful if the device itself is damaged, lost, or if you are trying to remember which model you own before you buy accessories or look up support information. Keep receipts or screenshots of orders for future reference.

Use Fitbit's official model comparison tool

Fitbit's website has a section where you can compare current models side by side. You can filter by device type (tracker, watch, or band style) and see photos and specifications for each one. If you have an older model that is no longer sold, Fitbit's support pages archive information about discontinued devices, including photos and specs you can use to match your device.

This visual approach works well if you are not sure whether you have a Charge 4 or Charge 5, or whether your square watch is a Sense or a Versa. The photos make the differences clear, and you can also see what bands and accessories are compatible with your specific model.

Frequently Asked Questions

What if my Fitbit is so old that Fitbit's website doesn't show it anymore?

Older models like Fitbit Flex, One, or early Charge versions may not appear on the current product pages. Search for your model number on Fitbit's support site — they keep archived pages for discontinued devices. You can also search the model name and number on Google to find retailer pages or tech forums where people discuss that specific model.

Can I tell the difference between Fitbit Charge 4 and Charge 5 just by looking?

Yes. The Charge 5 has a larger, brighter screen and a slightly different band design. The Charge 4 is slightly smaller and has a dimmer screen. The easiest way is to check the back of the device or open the Fitbit app — the model name will be listed clearly there.

My Fitbit won't turn on. Can I still find out which model it is?

Yes. Check the back of the device, the band, or the original box for the model name or number. You can also look at your phone's Fitbit app — it will still show the device model even if the device itself is not currently powered on or connected.

Is the model number the same as the serial number?

No. The model number (like FB418) identifies the type of device. The serial number is a unique code specific to your individual device. Both appear on the back or in the app, but they serve different purposes. The model number tells you which Fitbit you have; the serial number identifies your specific unit.

Where do I find the model information if I bought a used Fitbit?

Check the back of the device and the removable band first. If those are worn, open the Fitbit app and connect the device — the app will display the model name. If the device will not connect, search the model number on Fitbit's support site or ask the seller what model they originally purchased.