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Coros PACE 4 vs Polar Street X

Physical
Case diameter — —
Case thickness — —
Weight 40 g 48 g
Case material — —
Bezel material Polymer —
Lens / crystal — —
Strap material Silicone / Nylon —
Strap width — —
Colors available — —
Water resistance 50 m —
Military standard — —
Display
Display type AMOLED —
Display diagonal 30.48 mm —
Resolution width 390 px —
Resolution height 390 px —
Touchscreen Yes Yes
Always-on display Yes No
Max brightness — —
Battery
Smartwatch mode — —
GPS-only mode — —
All-systems GPS mode 41 h —
Max battery saver mode — —
Charging type — —
Solar charging No No
Wireless charging No No
Positioning
GNSS systems GPS, GLONASS, Galileo, BeiDou, QZSS —
Multi-band / dual-frequency Yes No
Offline maps No No
Built-in maps No No
Turn-by-turn navigation No No
Sensors
Optical heart rate Yes Yes
ECG No No
SpO2 / pulse oximeter Yes No
Skin temperature No Yes
Accelerometer No No
Gyroscope No No
Compass Yes No
Barometric altimeter Yes Yes
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi Yes No
NFC payments No No
Cellular / LTE No No
ANT+ No No
Music storage Yes No
Third-party apps No No
Satellite communication No No
Health & Fitness
Sleep tracking Yes Yes
Stress tracking No No
HRV tracking Yes Yes
Training load Yes No
Training readiness / recovery Yes No
VO2 max estimate Yes No
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking Yes Yes
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes No
Software
Operating system — —
Companion app — —
Voice assistant — —
Contactless payments No No