Garmin Forerunner 45 vs Garmin Forerunner 745

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Forerunner 45 compared with Forerunner 745

	GarminForerunner 45	GarminForerunner 745
Overview
Released
Released	May 2019	September 2020
Display
Case sizes
Case sizes	42 mm	44 mm
Panel
Panel	Memory-in-pixel	Memory-in-pixel
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	1.04-inch (26.3 mm) sunlight-readable colour MIP display, 208 x 208 pixels, with button controls.	1.2-inch (30.4 mm) transflective colour memory-in-pixel display, 240 x 240 pixels, with button controls.
Screen protection
Screen protection	Chemically strengthened glass.	Corning Gorilla Glass DX.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	No	Yes
Skin temperature
Skin temperature	No	No
Sleep apnoea alerts
Sleep apnoea alerts	No	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	No	No
Crash detection
Crash detection	No	No
GPS
GPS	Single-band	Single-band
Water resistance
Water resistance	50 m	50 m
Sensors
Sensors	GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate and accelerometer.	GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer and thermometer.
Health features
Health features	All-day heart rate, stress and sleep tracking, plus Body Battery energy monitoring.	Pulse Ox, sleep, all-day stress and Body Battery energy monitoring.
Fitness features
Fitness features	Garmin Coach, VO2 max estimate, running and cycling profiles, indoor track, treadmill, elliptical, cardio and yoga activities.	Triathlon, running, cycling and swimming profiles; daily suggested workouts, training status and load, VO2 max, recovery time, PacePro and course guidance. Detailed running dynamics require a compatible pod or strap.
Safety features
Safety features	Incident detection, assistance and LiveTrack require a paired phone.	Incident detection and assistance require a paired smartphone; LiveTrack.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 7 days	Up to 7 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Battery life detail
Battery life detail	Up to seven days in smartwatch mode or 13 hours in GPS mode.	Up to seven days in smartwatch mode, 16 hours in GPS mode without music or six hours with GPS and music.
Charging
Charging	Rechargeable battery with Garmin charging cable.	Rechargeable battery with Garmin charging cable.
Connectivity
Connectivity	Bluetooth and ANT+; smart notifications, phone music controls and Connect IQ watch faces. No on-watch music storage.	Bluetooth, ANT+ and Wi-Fi; Garmin Pay, Connect IQ, smart notifications and on-watch storage for up to 500 songs.
Design
Weight (lightest version)
Weight (lightest version)	36 g (better)	47 g
Software
Software	Garmin	Garmin
Case materials
Case materials	Silicone band and 5 ATM water rating.	Fibre-reinforced polymer bezel and silicone band; 5 ATM water rating.
Size
Size	42 x 42 x 11.4 mm; 36 g.	43.8 x 43.8 x 13.3 mm; 47 g.
Bands
Bands	Fits wrists 129–197 mm.	–
Colours
Colours	Lava red band with black case.	Black.