If you’ve ever pulled an old Fitbit out of a drawer and thought, “Which Fitbit do I have?” — you’re not alone.
Dead battery, missing charger, no box, no clue. Fitbit has released dozens of models over the years, and many of them look almost identical.
The good news? You can identify any Fitbit model — even very old ones — in under 2 minutes. This guide shows you exactly where to look, how to decode model numbers, and how to tell similar Fitbits apart, without tech jargon or guesswork.
Quick Answer: How Do I Know What Fitbit I Have?
If your Fitbit is paired with your phone:
- Open the Fitbit app
- Tap your profile picture (top-left)
- Your Fitbit model name appears under your devices
If it’s not paired or won’t turn on:
- Check the back of the device for a small model number (e.g., FB512, GA05183)
- Or go to Settings → About → Regulatory Info on the device
Once you have the model number, match it with the comparison chart below to identify your exact Fitbit.
Step-by-Step Guide: How to Identify Your Fitbit Model
1. Check the Fitbit App (Paired Device)
This is the easiest and most accurate way to check. If your Fitbit is connected:
- Open the Fitbit app
- Tap your profile picture
- Under your account, you’ll see the device name — like Fitbit Charge 6, Versa 3, or Inspire 3
This works for all Fitbit models, from the first-generation Fitbit to the newest Fitbit watches.
2. Find the Model Number Physically
If your Fitbit isn’t paired or is dead:
- Flip your Fitbit over and check the back near the sensors or on the band clasp.
- Look for a code like FB507, FB418, etc.
These codes tie directly to Fitbit versions, which you can match below.
Fitbit Models by Number (all fitbit models)
📘 Fitbit Watch Name, Model Number & Release Date
| Watch Name | Model Number(s) | Release Date |
|---|---|---|
| Ace | FB411 | 2018 |
| Ace 2 | FB414 | 2019 |
| Ace 3 | FB419 | 2021 |
| Ace LTE | GA05576-NA | 2024 |
| Ace LTE Mild | GA05577-NA | 2024 |
| Alta | FB406 | 2016 |
| Blaze | FB502 | 2016 |
| Charge HR | FB405 | 2014 |
| Charge 2 | FB407 | 2016 |
| Charge 3 | FB409, FB410 | 2018 |
| Charge 4 | FB417 | 2020 |
| Charge 5 | FB421 | 2021 |
| Charge 6 | GA05195-WW | 2023 |
| Flex 2 | FB403 | 2016 |
| Inspire | FB412 | 2019 |
| Inspire 2 | FB418 | 2020 |
| Inspire 3 | FB424 | 2022 |
| Ionic | FB503 | 2017 |
| Luxe | FB422 | 2021 |
| Sense | FB512 | 2020 |
| Sense 2 | FB521 | 2022 |
| Surge | FB501 | 2014 |
| Versa | FB504, FB505 | 2018 |
| Versa Lite | FB415 | 2019 |
| Versa 2 | FB507 | 2019 |
| Versa 3 | FB511 | 2020 |
| Versa 4 | FB523 | 2022 |
Wondering what that tiny code on your tracker means? Here’s a quick guide to identify every Fitbit model, including Fitbit’s older models and current versions.
This list includes classic Fitbits, Fitbit watch models, and even the first Fitbit tracker released years ago.
Whether you’re comparing Fitbit Charge models or trying to identify a Fitbit 1st gen, this chart has your back.
What If You Still Can’t Tell Which Fitbit You Have?
Still stumped? You can:
- Post a picture in a Fitbit forum, Facebook group, or Reddit
- Check the Fitbit serial number on the box
- Use a Fitbit comparison table online with pictures
Some quizzes and tools can help with Fitbit model identification if visuals help you more.
Why Identifying Your Fitbit Model Matters
Knowing your exact model helps with:
- Buying the right bands or chargers (different Fitbit charger types exist)
- Getting software updates (some older Fitbits no longer receive updates)
- Selling or trading in your device
- Getting help from Fitbit support, who will ask for the exact Fitbit model number
I’ve seen people buy the wrong accessories for Fitbit varieties more times than I can count. A quick check saves time and money.
Common Confusions: Lookalike Fitbit Models
Some Fitbit styles look nearly identical. Here’s how to tell them apart:
Versa 3 vs Versa 4
- Versa 3: Capacitive side button
- Versa 4: Physical button returns (finally!)
Sense 2 vs Versa 4
- Same design
- Sense 2: Has ECG, EDA, and skin temperature sensors
- Versa 4: Lacks advanced sensors but great value
If you’re not sure, check inside the settings — that’s often the easiest way to tell the difference between Fitbits that look alike.
Where Is My Fitbit Model Number Located?
- Back of the device (most common)
- Band clasp on some older units
- Settings → About → Regulatory Info (if powered on)
These tips work whether you’re using a Fitbit Charge Inspire 2, a Fitbit Versa series, or one of the Fitbit older models still floating around in 2026.
FAQs: Which Fitbit Do I Have? (2026)
Q: How do I know what Fitbit model I have?
The easiest way is through the Fitbit app:
Open the Fitbit app
Tap your profile picture (top-left)
Your connected Fitbit model name will be displayed
If your Fitbit isn’t paired or won’t turn on, check the back of the device for a model number (like FB407 or FB512) or go to Settings → About → Regulatory Info if it powers on.
Q: Can I identify my Fitbit by size or shape alone?
Partially. Some Fitbit models share similar designs.
For accurate identification, combine:
Screen shape
Button type (physical vs capacitive)
Sensors on the back
Model number
Example:
Versa 3 vs Versa 4 → button type
Sense 2 vs Versa 4 → advanced health sensors
Q: Where is the serial number on a Fitbit?
You can find your Fitbit serial number in several places:
Fitbit app → Profile → Device → Device Information
Back of the device (may require removing the band)
Original box or invoice
Fitbit website → Settings → Devices
Serial numbers usually start with FB or GA.
Q: How do I know if my Fitbit is charging?
Look for a battery icon or animation on the screen. No screen activity? Try a different charger or clean the contacts.
How do I determine what model of Fitbit I have (especially an older one)?
Older Fitbit models can look very similar, so use a combination of these methods:
Model number on the back of the tracker or band clasp
Design clues (screen shape, buttons, band style)
Charging cable type (many older Fitbits use unique chargers)
Once you find the model code, search:
“Fitbit FB407 model”
This works well even for discontinued Fitbits like Alta, Charge 2, Blaze, or Surge.
Final Thoughts: How to Tell Which Fitbit I have
Fitbit has released dozens of trackers over the years — from the Fitbit 1st generation to the latest version of Fitbit Charge 6. It’s no wonder many users ask, “How can I tell which Fitbit I have?” or “How to identify my Fitbit model?”
The good news? It only takes a few minutes to figure it out — and once you do, you’ll avoid accessory mismatches, update confusion, and tech headaches.
Whether you’re rocking a classic Fitbit Alta, a Versa 4, or trying to ID an old Fitbit Charge, this guide is here to help.
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Still deciding which Fitbit makes the most sense for everyday use? Once you’ve identified your model, it’s worth exploring which devices offer the best readability, comfort, and health features—especially for older users.
Check out our in-depth guide on Best Fitbit for Seniors in 2026: Unlocking Wellness with Comprehensive Fitness Trackers to see which models stand out for heart health tracking, simple controls, long battery life, and overall ease of use.
Also Look: –
- Fitbit’s Top Budget Smartwatch Drops to Just $80!
- Your Fitbit Is Lost? Don’t Panic! Here’s How to Find It in Minutes.
- How to Setup YouTube Music Control on Fitbit Charge 6.
- Fitbit Not Tracking Steps? How to Fix.
- How to Use Spotify on Fitbit Versa 2: Easy Steps & Tricks.
- 11 Signs Your Fitbit is Dying: Is it Time to buy a new Fitbit?
2 Comments
what model is this Fitbit?
model fitbit “3F15F09850E1”
I think The serial number “3F15F09850E1” corresponds to a Fitbit Charge 4