In depth comparison and review of Garmin Forerunner 45S and Apple Watch Ultra 2. Compare sizes, functions, displays, batteries and other important specifications and features to easily choose the right smartwatch for you. Our goal is to help you uncover differences between the products and find the watch that will best fit your needs.
| GENERAL | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Product Type | Sport watch | Smart watch |
|---|---|---|
| Operating System | - | WatchOS 10 |
| Supported Host Device OS | iOS, Android | iOS 17 or later |
| Activity/Sport | - | Multisport, custom workouts |
| Wearing Style | Watch style | Watch style |
| Audio Input | - | Three-microphone array |
| Audio Output | - | Dual speakers |
| Width | 39.5 mm | - |
| Height | 39.5 mm | - |
| Depth | 11.4 mm | - |
| Weight | 32 g | - |
| Body Details | - | Case only: 61.4 g |
| Body Material | - | Aerospace-grade titanium |
| Protection | Waterproof | Water-resistant, splash-resistant, corrosion resistant, dust-resistant |
| Clock Display | Yes | Yes |
| FEATURES | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Sensors | Accelerometer, heart rate | Accelerometer, ambient light sensor, digital compass, depth gauge, electrical heart sensor, ECG sensor, blood oxygen sensor, gyroscope, water temperature sensor, temperature sensing, optical heart sensor (3d gen), always-on altimeter |
|---|---|---|
| Tracking Data | Distance, time, speed, calories burned, sleep activity, heart rate, stress level | Distance, time, calories burned, activity, sleep activity, heart rate, blood oxygen saturation, sleep stages, menstrual cycle, ECG, ovulation phase, rapid eye movement (REM), depth |
| Modes | - | Night mode |
| Goal Setting | Yes | Yes |
| Features | Music remote handling, find phone function, HR zones, Move IQ, Garmin Connect compatible, Find my Device | Call handling, store & play music, Fall detection, Emergency SOS, heart rate zones, Family Setup support, International Emergency Calling, Siren (86-decibel), Crash Detection, noise monitoring, Compass Waypoint, precision finding for iPhone, brightness: 3000 nits, flashlight boost, track detection |
| Notifications | Calendar, Email, social apps | Calendar, SMS, Email, high and low heart rate, irregular rhythm, cardio fitness |
| Vibrating Alert | Yes | Yes |
| Feedback Type | - | Audio alert, vibration alert, visual interface |
| Navigation (GPS) | - | GPS/GLONASS/Galileo/BeiDou/QZSS receiver |
| Payment Technology | - | Apple Pay |
| Internet of Things (IoT) Compatible | - | Yes |
| IoT Intelligent Assistant | - | Siri |
| IoT Voice Controlled | - | Direct |
| CELLULAR | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Technology | - | WCDMA (UMTS) |
|---|---|---|
| Mobile Broadband Generation | - | 4G |
| SIM Card Type | - | Electronic SIM card (e-SIM) |
| CONNECTIVITY | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| 3M UMTS Band | - | Band 1, Band 2, Band 5, Band 10 |
|---|---|---|
| 4G LTE Band | - | Band 1, Band 2, Band 3, Band 4, Band 5, Band 6, Band 7, Band 8, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 39, Band 40, Band 41, Band 66 |
| Wireless Interface | Bluetooth, ANT+ | IEEE 802.11b/g/n, LTE, Ultra-Wideband (UWB), Bluetooth 5.3 |
| DISPLAY | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Type | Memory-in-Pixel LCD - colour - transflective | Retina LTPO OLED - colour |
|---|---|---|
| Resolution | 208 x 208 pixels | 410 x 502 pixels |
| Screen Size | 1.04" | - |
| Screen Protection | - | Flat sapphire front crystal with display edge protection |
| Always On Display (AOD) | - | Yes |
| INPUT DEVICE | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Type | - | Touch sensitive screen, customisable action button, side button, double tap gesture |
|---|
| CASE | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Case Size | - | 49 mm |
|---|---|---|
| Case Shape | Round | Rectangular |
| Case Details | White | Iris | Black | Titanium |
| Crown Type | - | Digital with haptic feedback |
| BAND | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Band Type | Band | Alpine Loop |
|---|---|---|
| Band Size | S | S |
| Fits Wrist with Circumference | 124-185 mm | 130-160 mm |
| Changeable | Yes | Yes |
| Clasp Type | Buckle | G-hook |
| Band Material | Silicone | Textile |
| Band Colour | White | Iris | Black | Blue | Indigo | Olive | Orange/beige | Green/gray | Blue/black | Orange | White |
| STORAGE | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Storage Capacity | - | 64 GB |
|---|
| CPU | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Manufacturer | - | Apple |
|---|---|---|
| CPU Type | - | S9 SiP |
| Features | - | W3 Apple wireless chip, second-generation Ultra Wideband chip, 4-core Neural Engine |
| BATTERY | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Technology | - | Lithium Ion |
|---|---|---|
| Battery Life | - | 36 hours |
| Battery Life Details | GPS mode - up to 13 hour(s) Smartwatch mode - up to 7 days |
Normal use - up to 36 hour(s) Low power mode - up to 18 hour(s) Power saving mode - up to 72 hour(s) |
| Rechargeable Battery | - | Yes |
| Wireless Charging | - | Yes |
| MISCELLANEOUS | Garmin Forerunner 45S | Apple Watch Ultra 2 |
|---|
| Included Accessories | Charging/data cable | Magnetic fast charger to USB-C cable (1 m) |
|---|---|---|
| Preloaded Software | - | GymKit, Oceanic+, Depth app |
| Compliant Standards | - | IP6X, BFR-free, PVC-free, Beryllium-free, Mercury-free, MIL-STD-810H, EN13319, Arsenic-free |
| Specific Absorption Rate (SAR) | - | 0.22 W/kg (head) 0.43 W/kg (limb) |
| Carbon Footprint | - | 0 kg carbon emissions |
| Max Depth of Water Resistance | 50 m | 100 m |
| Max Operating Temperature | - | 55 °C |
| Min Operating Temperature | - | -20 °C |
| Manufacturer Model Number | - | A2986 |
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