Side by side comparison and review of Garmin Forerunner 45S and Fitbit Sense 2. Compare design, displays, functions, batteries and other key specifications and features to simplify the choice of your perfect smartwatch. Our goal is to make it easier for you to decide on the watch that will best meet your expectations by revealing the main differences between the products.
GENERAL | Garmin Forerunner 45S | Fitbit Sense 2 |
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Product Type | Sport watch | Smart watch |
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Supported Host Device OS | iOS, Android | Android 8.0 (Oreo) or later, iOS 14 or later |
Activity/Sport | - | Multisport |
Wearing Style | Watch style | Watch style |
Audio Input | - | Microphone |
Audio Output | - | Speaker |
Width | 39.5 mm | 40.5 mm |
Height | 39.5 mm | 40.5 mm |
Depth | 11.4 mm | 12.3 mm |
Weight | 32 g | - |
Body Material | - | Aluminium |
Protection | Waterproof | Water-resistant |
Clock Display | Yes | Yes |
FEATURES | Garmin Forerunner 45S | Fitbit Sense 2 |
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Sensors | Accelerometer, heart rate | Ambient light sensor, altimeter, SpO2 sensor, 3-axis accelerometer, temperature, optical heart sensor, electrodermal activity (EDA) sensor, vibration motor, multipurpose electrical sensor |
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Tracking Data | Distance, time, speed, calories burned, sleep activity, heart rate, stress level | Distance, calories burned, activity, sleep activity, heart rate, steps taken, floors climbed, blood oxygen saturation, stress level, active time, menstrual cycle, breathing rate, temperature, sleep quality score, blood glucose |
Modes | - | 40+ sports modes |
Goal Setting | Yes | Yes |
Features | Music remote handling, find phone function, HR zones, Move IQ, Garmin Connect compatible, Find my Device | Find phone function, automatic exercise recognition, breathing training function, Active Zone Minutes, HRV index, Sleep Score, Sleep Profile, Stress Management Score, Daily Readiness Score, all day body response tracking, cardio fitness score |
Notifications | Calendar, Email, social apps | SMS, applications, high and low heart rate, calls, irregular rhythm |
Vibrating Alert | Yes | Yes |
Feedback Type | - | Vibration alert, visual interface |
Navigation (GPS) | - | GPS/GLONASS receiver |
Payment Technology | - | FitBit Pay |
Internet of Things (IoT) Compatible | - | Yes |
IoT Intelligent Assistant | - | Alexa built-in |
IoT Voice Controlled | - | Direct |
CONNECTIVITY | Garmin Forerunner 45S | Fitbit Sense 2 |
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Wireless Interface | Bluetooth, ANT+ | NFC, Bluetooth 5.0 |
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DISPLAY | Garmin Forerunner 45S | Fitbit Sense 2 |
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Type | Memory-in-Pixel LCD - colour - transflective | Colour |
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Resolution | 208 x 208 pixels | - |
Screen Size | 1.04" | - |
Always On Display (AOD) | - | Yes |
INPUT DEVICE | Garmin Forerunner 45S | Fitbit Sense 2 |
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Type | - | Touch sensitive screen, push button |
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CASE | Garmin Forerunner 45S | Fitbit Sense 2 |
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Case Shape | Round | Square |
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Case Back | - | Aluminium |
Case Details | White | Iris | Black | Platinum aluminum |
BAND | Garmin Forerunner 45S | Fitbit Sense 2 |
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Band Type | Band | Band |
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Band Size | S | S |
Fits Wrist with Circumference | 124-185 mm | 129-175 mm |
Changeable | Yes | Yes |
Clasp Type | Buckle | Pin-and-tuck |
Band Material | Silicone | - |
Band Colour | White | Iris | Black | Lunar white |
BATTERY | Garmin Forerunner 45S | Fitbit Sense 2 |
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Technology | - | Lithium polymer |
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Battery Life | - | 6 day(s) |
Battery Life Details | GPS mode - up to 13 hour(s) Smartwatch mode - up to 7 days |
GPS mode - up to 5 hour(s) |
Recharge Time | - | 2 hours |
MISCELLANEOUS | Garmin Forerunner 45S | Fitbit Sense 2 |
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Included Accessories | Charging/data cable | Charging cable, 6-month Fitbit Premium membership, wristband (158 - 209 mm) |
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Preloaded Software | - | Alarm, FitBit Pay |
Max Depth of Water Resistance | 50 m | 50 m |
Max Operating Temperature | - | 45 °C |
Min Operating Temperature | - | -10 °C |
Warranty | - | 2-year warranty |