Apple Watch Series 9 vs Fitbit Sense 2
Two makers, one class, one decision: the Apple Watch Series 9 from Apple or the Fitbit Sense 2 from Fitbit. This one has a front-runner. The Fitbit Sense 2 wins 1 of 4 compared areas, and battery life is where the difference is hardest to miss. Add $99 of difference in launch price, and the Fitbit Sense 2 has a strong argument before a single spec is compared.
At a glance
- Display Tie
- Health & Fitness Sensors Tie
- Battery Life Fitbit Sense 2 wins
- Smart Features & Connectivity Apple Watch Series 9 wins
- Price Fitbit Sense 2 wins
- Health & Fitness Sensors7.1
- Smart Features & Connectivity10.0
- Health & Fitness Sensors7.1
- Smart Features & Connectivity5.0
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
-
The Fitbit Sense 2 has 700% more rated battery life
At 6 days versus 18 h, this is a decisive lead for the Fitbit Sense 2, the kind of difference you notice without looking for it. The Fitbit Sense 2 is rated to last longer between charges, a big deal on trips and long weekends.
-
The Apple Watch Series 9 has a cellular option
This is a feature gap rather than a spec gap: the Fitbit Sense 2 simply lacks it. A cellular option lets the watch take calls, receive messages and stream music without your phone nearby.
Design & Size
Design & Durability
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Case size (largest) | 45 mm | N/A (not specified) |
| Available sizes | 41 mm, 45 mm | N/A (not specified) |
| Water resistance | 50 m | 50 m |
| Case material | Aluminum, stainless steel | N/A (not specified) |
| Thickness | 0.42 in | N/A (not specified) |
| Weight (largest, no band) | 1.37 oz | N/A (not specified) |
Display
Too close to call
Swap one for the other and you’d lose nothing on display. Treat display as common ground and look elsewhere for the deciding factor.
Health & Fitness Sensors
Too close to call
The differences on health & fitness sensors are small enough to ignore in daily use. The health & fitness sensors verdict: no winner, and no reason to worry either way.
Battery Life
Fitbit Sense 2 leads
In the battery life category, the Fitbit Sense 2 isn’t just ahead; it’s clearly ahead. The Fitbit Sense 2 comes with 700% more rated battery life. Ratings assume typical use; GPS workouts and always-on screens will shorten both. The takeaway: on battery life, the Fitbit Sense 2 is the stronger watch.
Rated battery life
Apple Watch Series 9: 18 h Fitbit Sense 2: 6 days Longer battery life means fewer nights on the charger, which also makes sleep tracking easier.
Smart Features & Connectivity
Apple Watch Series 9 leads
If you’re keeping score, the smart features & connectivity point goes narrowly to the Apple Watch Series 9. The Apple Watch Series 9 makes its case with a cellular option. Cellular models usually cost more and need a plan, so it’s only worth it if you’ll use the freedom. Prioritize smart features & connectivity, and the Apple Watch Series 9 is where you should land.
Cellular option
Apple Watch Series 9: yes Fitbit Sense 2: no With the Apple Watch Series 9, you can leave your phone at home on a run; the Fitbit Sense 2 depends on it for connectivity.
Full Specifications
Display
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Display type | Always-On Retina LTPO OLED | Color AMOLED |
| Resolution (largest) | 396 x 484 | N/A (not specified) |
| Peak brightness | 2,000 nits | N/A (not specified) |
| Always-on display | Yes | Yes |
Health & Fitness Sensors
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Optical heart rate | Yes | Yes |
| ECG | Yes | Yes |
| Blood oxygen | Yes | Yes |
| Skin temperature | Yes | Yes |
| GPS | Built-in L1 GPS (GLONASS, Galileo, QZSS, BeiDou) | Built-in GPS + GLONASS |
| Dual-frequency GPS | No | No |
Battery Life
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Rated battery lifeManufacturer rating, typical use | 18 h | 6 days (winner) |
| Rated life in low-power modeManufacturer rating | 36 h | N/A (not specified) |
| Charging | Fast charging, 0 to 80% in about 45 min | N/A (not specified) |
Smart Features & Connectivity
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Chip | S9 | N/A (not specified) |
| Storage | 64 GB | N/A (not specified) |
| Cellular option | Yes (winner) | No |
| Contactless payments | Yes | Yes |
| Phone compatibility | iPhone only | iPhone and Android |
| Software | watchOS | Fitbit OS |
Design & Durability
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Case size (largest) | 45 mm | N/A (not specified) |
| Available sizes | 41 mm, 45 mm | N/A (not specified) |
| Water resistance | 50 m | 50 m |
| Case material | Aluminum, stainless steel | N/A (not specified) |
| Thickness | 0.42 in | N/A (not specified) |
| Weight (largest, no band) | 1.37 oz | N/A (not specified) |
Price
| Spec | Apple Watch Series 9 | Fitbit Sense 2 |
|---|---|---|
| Launch price | $399 | $300 (winner) |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Price & Value
Price alone could settle this for some buyers, with the Fitbit Sense 2 launching $99 lower, a gap of 33%. On value, the Fitbit Sense 2 is the easy call: $99 less and ahead on balance.
Launch prices (US) as of September 2023. Discounts and bundles come and go, so compare current prices before buying.
Which One Should You Buy?
Choose the Apple Watch Series 9 if…
- you like leaving your phone at home on runs
- you’re comfortable with how Apple does things
Choose the Fitbit Sense 2 if…
- you hate charging your watch every day (6 days vs 18 h)
- you’d put the $99 saving toward something else
- you trust Fitbit and want to keep things familiar
Also Compared
Frequently Asked Questions
Which is better for most people, the Apple Watch Series 9 or the Fitbit Sense 2?
The Fitbit Sense 2 makes more sense overall. Consider the alternative only if you need a cellular option, which only the Apple Watch Series 9 offers.
Does the Apple Watch Series 9 last longer on a charge than the Fitbit Sense 2?
The Fitbit Sense 2 comes out ahead on rated battery life, with 6 days compared with 18 h on the Apple Watch Series 9.
Which costs less, the Apple Watch Series 9 or the Fitbit Sense 2?
At launch, the Fitbit Sense 2 undercut the Apple Watch Series 9 by $99. These figures are as of September 2023, and street prices can change.
Executive Summary
On paper, the Apple Watch Series 9 and the Fitbit Sense 2 chase the same buyer. In the details, Apple and Fitbit made different calls. It’s hard to argue with 700% more rated battery life, which is exactly what the Fitbit Sense 2 brings. I’ll admit the Apple Watch Series 9 has a point with a cellular option.
Choose by what you’d use most: smart features & connectivity leads to the Apple Watch Series 9, battery life leads to the Fitbit Sense 2.
My pick: the Fitbit Sense 2, unless you know that a cellular option would make a real difference in your routine, in which case the Apple Watch Series 9 earns its place.
Personal opinion based on the data above. Your priorities may differ.