Fitbit is responsible for several excellent fitness-first smartwatches, such as the Sense and Versa series. That said, its bread and butter model lineup has long been its Charge family. While the Charge 5 is the latest and greatest tracking in the lineup, the company’s two older Charge models are still excellent buys. But should you purchase the Charge 3 or the Charge 4? In this Fitbit Charge 3 vs Charge 4 comparison, we detail the company’s two devices alongside one another, outlining the key differences and similarities.

Our verdict: Fitbit Charge 3 review | Fitbit Charge 4 review


Fitbit Charge 3 vs Charge 4 specs

 Fitbit Charge 3Fitbit Charge 4
Display1-inch touchscreen OLED
160×100
Corning Gorilla Glass 3
1-inch touchscreen OLED
160×100
Corning Gorilla Glass 3
Battery7 days
Lithium-polymer
7 days
5 hours with GPS
Lithium-polymer
MemorySaves 7 days of motion data
Saves daily totals for the last 30 days
Heart rate data at one-second intervals during exercise tracking and at five-second intervals all other times
Saves 7 days of detailed motion and heart rate data, minute by minute
Saves daily totals for the last 30 days
Heart rate data at one-second intervals during exercise tracking and at five-second intervals all other times
Sensors3-axis accelerometer
Optical heart rate monitor
Altimeter
Vibration motor
Relative SpO2 sensor
NFC for Fitbit Pay (special edition only)
3-axis accelerometer
Optical heart rate monitor
Altimeter
GPS + GLONASS
SpO2 sensor
Skin temperature sensor
Vibration motor
NFC
IP rating5ATM5ATM
Smart featuresCall, text, calendar, email, music control, quick repliesCall, text, calendar, email, music control with Spotify support, Fitbit Pay, and quick replies
CompatibilityAndroid, iOS, WindowsAndroid, iOS, Windows
DimensionsSmall: 139.7 – 180.3mm
Large: 180.3 – 220.99mm
Small: 140 – 180mm
Large: 180mm – 220mm
ColorsBlack/graphite aluminum
Blue-gray / rose gold aluminum
Lavender woven/rose gold aluminum
Frost white sport/graphite aluminum
Black
Rosewood
Storm Blue/Black
Special Edition Granite/Reflective Woven


Fitbit Charge 3 vs Charge 4 features

There’s very little separating the Fitbit Charge 3 and Charge 4 on paper or in the flesh. The two trackers are physically identical, from their monochrome OLED displays to their 5ATM water-resistant bodies. This philosophy has its advantages, but it also comes at a cost. You can use Fitbit Charge 3 bands on the Charge 4, and the Charge 3’s excellent build quality continues into the newer tracker. But the Charge 4 also features a few of its predecessor’s design issues, like an unreliable inductive button and somewhat bland aesthetic.

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