Garmin Forerunner 570 vs Garmin Forerunner 645 Music

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Forerunner 570 compared with Forerunner 645 Music

	GarminForerunner 570	GarminForerunner 645 Music
Overview
Released
Released	May 2025	2018
Display
Case sizes
Case sizes	42 mm or 47 mm	42.5 mm
Panel
Panel	OLED	Memory-in-pixel
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	42 mm model has a 1.2″ (30.4 mm) AMOLED touchscreen, 390 x 390 pixels; 47 mm has a 1.4″ (35.3 mm) AMOLED touchscreen, 454 x 454 pixels; five buttons; optional always-on mode	1.2-inch (30.4 mm) sunlight-readable transflective colour MIP display, 240 x 240 pixels, with five-button control.
Screen protection
Screen protection	Corning Gorilla Glass 3	Chemically strengthened glass.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	Yes	No
Skin temperature
Skin temperature	Yes	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	Dual-band (L1 and L5)	Single-band
Water resistance
Water resistance	50 m	50 m
Sensors
Sensors	Garmin Elevate wrist heart rate monitor; Pulse Ox blood oxygen monitor; barometric altimeter; compass; gyroscope; accelerometer; thermometer; ambient light sensor	GPS, GLONASS, Garmin Elevate wrist heart rate, barometric altimeter, compass, gyroscope, accelerometer and thermometer.
Health features
Health features	Skin temperature; high and low heart rate alerts; HRV status; Body Battery; all-day stress; sleep score, sleep coach, sleep alignment and nap detection; breathing variations; Health Snapshot; women's health tracking with past ovulation estimates; jet lag adviser	All-day heart rate, steps, sleep and intensity minutes.
Fitness features
Fitness features	Training readiness and training status; training load, load ratio and load focus; training effect, VO2 max and recovery time; wrist-based running power and dynamics; PacePro; race predictor and projected race time; Garmin Coach and Garmin Triathlon Coach plans; daily suggested workouts; multisport workouts; heat and altitude acclimation; course navigation, TracBack and Up Ahead; triathlon and open-water swimming	Running, indoor running, cycling, pool swimming, skiing and rowing profiles; training status and load, aerobic and anaerobic training effect, VO2 max, recovery time and breadcrumb course guidance. Detailed running dynamics require an HRM strap or Running Dynamics Pod.
Safety features
Safety features	Incident detection during select activities; assistance; LiveTrack; live event sharing (Android only); these features require a paired phone	–
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 11 days	Up to 7 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Storage
Storage	8 GB	–
Battery life detail
Battery life detail	Smartwatch mode up to 10 days (42 mm) or 11 days (47 mm); GPS only up to 18 hours for either size; SatIQ (AutoSelect) up to 14 or 16 hours; All-Systems + Multi-Band up to 13 or 14 hours; with music, GPS only up to nine hours and the other two modes up to eight hours for either size	Up to seven days in smartwatch mode or five hours with GPS and music according to the exact model's Garmin Singapore specification table. Its prose also says 14 GPS hours without stating a music-use condition.
Charging
Charging	Garmin charging cable with proprietary plug	Rechargeable battery with Garmin charging cable.
Connectivity
Connectivity	Bluetooth, ANT+ and Wi-Fi; multi-band GPS with GPS, GLONASS, Galileo, QZSS, BeiDou and SatIQ; Garmin Pay; music storage; speaker and microphone for calls and the phone's voice assistant with a paired phone; voice commands; Garmin Share; Connect IQ	Bluetooth, ANT+ and Wi-Fi; Garmin Pay, smart notifications, Connect IQ, LiveTrack and on-watch music playback to Bluetooth headphones.
Storage
Storage	–	Up to 500 songs and 200 hours of activity history.
Design
Weight (lightest version)
Weight (lightest version)	42 g (better)	42.2 g
Software
Software	Garmin	Garmin
Case materials
Case materials	Aluminium bezel; silicone band; 5 ATM water rating	Stainless steel bezel, chemically strengthened glass and silicone band; 5 ATM water rating.
Size
Size	42 mm model is 42.4 x 42.4 x 12.9 mm and 42 g; 47 mm model is 47 x 47 x 12.9 mm and 50 g; Garmin does not publish case-only weights	42.5 x 42.5 x 13.5 mm; 42.2 g.
Bands
Bands	Quick-release 20 mm bands for the 42 mm model, fitting 115–178 mm wrists; quick-release 22 mm bands for the 47 mm model, fitting 135–205 mm wrists	Quick-release 20 mm band; fits wrists 127–204 mm.
Colours
Colours	–	Black band and case with rose-gold hardware.
In the box
In the box	Forerunner 570, charging cable, documentation	–