COROS PACE 4 vs Polar Street X

COROS PACE 4

COROS PACE 4

vsPolar Street X

Polar Street X

COROS PACE 4Polar Street X
Display1.2-inch AMOLED touchscreen with tapered edge and automatic brightness (COROS cites 164% higher resolution than PACE 3)1.28-inch AMOLED touchscreen, 416 x 416, always-on option, Gorilla Glass 3
Body11.8 mm thick; 32 g with nylon band, 40 g with silicone band; Standard White version with fiber-reinforced polymer bezel; Black Crystal and Cloud White versions with aluminum alloy bezel45 x 45 x 13.8 mm; 48 g with wristband, 28 g without; bio-based plastic case; 22 mm quick-release strap
BatteryUp to 19 days of daily use; up to 41 hours of GPS in All Systems (High) GPS modeUp to 10 days in smartwatch mode; up to 43 hours with GPS in performance training mode (170 hours in eco mode); 385 mAh, replaceable
PositioningAll-Systems and Dual-Frequency satellite modesGPS, Galileo, BeiDou, QZSS with assisted GPS; barometer, compass; route guidance and back to start
SensorsRedesigned optical heart rate sensor with larger LEDs, built-in microphonePrecision Prime optical heart rate, nightly skin temperature, accelerometer, gyroscope, barometer, magnetometer; no ECG or SpO2
ControlsTouchscreen, two buttons and a tactile digital dial, plus an Action Button for data screens, media controls, breadcrumb navigation and Voice Pins—
ChargingUSB-C charging adapter (cable not included)—
BandsInterchangeable silicone or nylon bands—
SportsRunning fitness scores and tests, race predictions, personalized marathon plans, Virtual Pacer, Effort Pace, real-time activity alerts170+ sports and activities, Training Load Pro, Nightly Recharge, SleepWise, Sleep Plus Stages
HealthHRV, sleep, recovery time and menstrual cycle tracking—
MediaOn-watch media controls for skipping tracks or podcasts and adjusting volume—
Connectivity—Bluetooth LE; proprietary USB-C charging cable
Durability—WR50 water resistance; tested to MIL-STD-810H; -20 to 50 °C operation
Performance—275 MHz CPU, 5 MB memory, 32 MB storage
Extras—Integrated LED flashlight with white and red light; Polar Flow app and web service included
Colors—Night Black, Snow White, Forest Green