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Fitbit Ace LTE specifications and in-depth review

Fitbit Ace LTE

Manufacturer: Fitbit

The Fitbit Ace LTE is a smartwatch built specifically for children, combining connected features with health and activity tracking in a compact wearable. It carries a 1.61″ OLED screen with a 333 ppi pixel density and an always-on display, along with Gorilla Glass 3 protection and a touch-sensitive interface. The device weighs 28.03 g and measures 13.35 mm thick, making it reasonably lightweight for everyday wear.

On the connectivity side, the Ace LTE supports cellular via a single eSIM, Bluetooth 5, Wi-Fi 4 (802.11n), NFC, and Galileo satellite positioning, in addition to built-in GPS. It tracks steps, distance, pace, elevation, sleep, and calories, and the companion app covers goal setting, water intake, weight, and even ovulation and period predictions. The 328 mAh rechargeable battery is rated for up to 16 days of use and charges in approximately 1.16 hours. With 32 GB of internal storage and 2 GB of RAM, the watch also supports call handling and music playback, and carries a 5 ATM water resistance rating.

Pros
  • Rated at 5 ATM water resistance, making it suitable for swimming and everyday water exposure
  • Built-in cellular via eSIM allows independent use without a paired phone
  • 16-day battery life reduces the need for frequent charging
  • Comes with 32 GB of internal storage and 2 GB of RAM, offering substantial on-device capacity
  • Includes GPS, route tracking, and Galileo support for accurate location and movement logging
  • The watch band is replaceable, allowing for physical customisation over time
Cons
  • Does not support wireless charging, requiring a wired connection every time
  • Lacks a body temperature sensor, barometer, and HRV tracking, limiting advanced health monitoring
  • No multi-sport mode available, restricting structured tracking for varied athletic activities
  • Not compatible with Windows or Mac OS X, limiting desktop integration options
  • Does not include a smart alarm or voice commands, reducing hands-free and intelligent wake functionality
  • No swim stroke counter, which limits detailed tracking for swimming activities despite its water resistance rating
Who is this for?

This watch is well matched to children who need a connected wearable with independent communication capabilities, thanks to its built-in cellular via eSIM and call handling support. Its activity tracking — covering steps, distance, sleep, elevation, and route logging — suits kids and young teens with an active daily routine. The 5 ATM water resistance and replaceable band make it practical for school, sport, and outdoor use, while the 16-day battery life means it can go extended periods without needing to be charged, reducing daily maintenance for both the child and parent.

Who is this NOT for?

Users looking for advanced health monitoring will find this watch limiting, as it lacks HRV tracking, VO2 max measurement, ECG, and a body temperature sensor. It is not suited to serious or multi-discipline athletes either, given the absence of multi-sport mode and swim stroke counting. Additionally, the lack of Windows and Mac OS X compatibility makes it a poor fit for users who rely on desktop-based device management, and the absence of wireless charging may frustrate those who prefer a more seamless daily charging routine.

Design:

screen size 1.61"
Display type OLED/AMOLED
water resistance Water resistant
ATM rating 5 ATM
Always-On Display ✓
pixel density 333 ppi
Watch band is replaceable ✓
has branded damage-resistant glass ✓
Gorilla Glass version Gorilla Glass 3
thickness 13.35 mm
weight 28.03 g
height 44.89 mm
width 41.04 mm
Has a display ✓
has a touch screen ✓
Has sapphire glass display ✕
volume 24.59451276 cm³
is designed for kids ✓

The Fitbit Ace LTE is designed specifically for kids and features a 1.61″ OLED/AMOLED touchscreen with a pixel density of 333 ppi and an always-on display mode. The watch measures 44.89 mm in height, 41.04 mm in width, and 13.35 mm in thickness, with a total volume of approximately 24.59 cm³ and a weight of 28.03 g. Its screen is protected by Gorilla Glass 3, though it does not use sapphire glass. The watch band is replaceable, and the device carries a 5 ATM water resistance rating, making it suitable for everyday water exposure.

Sensors:

Monitors blood oxygenation levels ✓
Has a heart rate monitor ✓
has GPS ✓
has an accelerometer ✓
Has a temperature sensor ✕
has a compass ✓
Has a barometer ✕
has a gyroscope ✓
Has a cadence sensor ✕
Monitors perspiration ✕

The Fitbit Ace LTE includes a solid set of sensors, featuring a heart rate monitor and a pulse oximeter for tracking blood oxygenation levels. Built-in GPS enables location tracking, while an accelerometer and gyroscope handle motion detection and orientation. A compass is also present, rounding out the navigation-related hardware. However, the device does not include a body temperature sensor, barometer, cadence sensor, or perspiration monitor.

Activity tracking:

Tracks your sleep ✓
Tracks distance ✓
Tracks steps taken ✓
Measures pace ✓
Provides sleep reports ✓
Detects activities automatically ✓
Has a route tracker ✓
Tracks elevation ✓
Has multi-sport mode ✕
Has exercise tagging ✓
Has a stroke counter for swimming ✕
Tracks calorie intake ✓
Designed for diving ✕
Designed for golf ✕

The Fitbit Ace LTE covers a broad range of activity tracking functions, monitoring steps, distance, pace, elevation, and calorie intake on an ongoing basis. It detects activities automatically and supports exercise tagging, while a route tracker logs movement paths using the built-in GPS. Sleep tracking is included alongside detailed sleep reports, giving a fuller picture of daily recovery. The watch does not support multi-sport mode or swim stroke counting, and it is not designed for diving or golf.

Connectivity:

has a cellular module ✓
Is compatible with iOS ✓
Is compatible with Android ✓
Bluetooth version 5
supports Wi-Fi ✓
Wi-Fi version Wi-Fi 4 (802.11n)
supports ANT+ ✕
SIM cards 1 eSIM
has NFC ✓
supports Galileo ✓

The Fitbit Ace LTE is equipped with a cellular module using a single eSIM, allowing it to operate independently of a paired phone. It supports Bluetooth 5 and Wi-Fi 4 (802.11n), and is compatible with both iOS and Android devices. NFC is included, and the watch supports the Galileo satellite navigation system. ANT+ connectivity is not available on this model.

Battery:

battery life 16 days
battery power 328 mAh
charge time 1.16 hours
has wireless charging ✕
has a rechargeable battery ✓
Has a solar power battery ✕
has a removable battery ✕

The Fitbit Ace LTE houses a 328 mAh rechargeable battery with a rated battery life of 16 days, and it charges fully in approximately 1.16 hours. The battery is not removable, and the watch does not support wireless charging or solar charging.

Features:

has HRV tracking ✕
measures VO2 max ✕
measures resting heart rate ✓
has fast/slow heart rate notifications ✓
shows readiness level ✕
Can be used to answer calls ✓
Has call control ✓
Has notifications ✓
has irregular heart rate warnings ✕
Has ECG technology ✕
Has silent alarm ✓
Has vibrating alerts ✓
has fall detection ✕
Has a stopwatch ✓
Has smart alarm ✕
has voice commands ✕
RAM 2GB
internal storage 32GB
warranty period 1 years
number of microphones 1
has a front camera ✕

The Fitbit Ace LTE measures resting heart rate and provides fast/slow heart rate notifications, though it does not offer HRV tracking, VO2 max measurement, irregular heart rate warnings, ECG, or readiness and recovery scoring. On the communication side, the watch can answer calls and offers full call control, wrist notifications, and vibrating alerts, backed by a single built-in microphone. A silent alarm and stopwatch are also available, while smart alarm, voice commands, and fall detection are absent. The device comes with 32 GB of internal storage and 2 GB of RAM, has no front camera, and carries a one-year warranty.

App & Software:

Provides activity reports ✓
Has inactivity alerts ✓
Counts how many calories you've burned ✓
Has goal setting ✓
Has achievements ✓
Free app ✓
Has exercise diary ✓
Ad-free ✓
Has temperature tracking ✕
Has period notifications ✓
Has music playback ✓
Predicts ovulation ✓
Predicts start date ✓
Can be personalised ✓
Has barcode scanner on app ✕
Tracks water intake ✓
Has weight tracking ✓

The companion app for the Fitbit Ace LTE is free and ad-free, and supports personalisation to suit individual preferences. It provides activity reports, calorie burn tracking, an exercise diary, goal setting, inactivity alerts, and achievements, along with water intake and weight tracking. Music playback is supported directly through the app. On the health side, it includes period notifications, ovulation prediction, and menstrual cycle start date prediction, though temperature tracking and a barcode scanner are not available.

Miscellaneous:

has a battery level indicator ✓
Has auto pause ✓
Has passcode ✓
Compatible with smart scales ✓
Compatible with external heart rate monitors ✓
Is compatible with Windows ✕
has an external memory slot ✕
Is compatible with Mac OS X ✕
has a socket for a 3.5 mm audio jack ✕

The Fitbit Ace LTE includes a battery level indicator, auto pause, and passcode protection. It is compatible with smart scales and external heart rate monitors, broadening its use within a wider health tracking setup. The watch does not have an external memory slot or a 3.5 mm audio jack, and it is not compatible with Windows or Mac OS X.

Final Verdict

The Fitbit Ace LTE is a well-specified connected smartwatch built around the needs of younger users, combining independent cellular connectivity, solid activity tracking, and a durable design into a single wearable. Its built-in eSIM with call handling and 16-day battery life stand out as practical strengths that reduce reliance on a paired device and minimize daily upkeep. While it does not cater to advanced health monitoring or serious athletic training, those limitations are consistent with its intended audience. For parents seeking a capable, kid-focused wearable with genuine connectivity and reliable everyday tracking, the Fitbit Ace LTE delivers a focused and coherent feature set.