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Apple Watch SE (2nd generation) vs Apple Watch Series 9

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

AppleWatch SE (2nd generation)AppleWatch Series 9
Overview
ReleasedSeptember 2022September 2023
Display
Case sizes40 mm or 44 mm41 mm or 45 mm
PanelLTPO OLEDLTPO OLED
Peak brightness1,000 nits2,000 nits
Always-on displayNoYes
Display detailRetina LTPO OLED display; 324 x 394 pixels (40 mm) or 368 x 448 pixels (44 mm) at 326 ppi; 759 or 977 sq mm display areaAlways-On Retina LTPO OLED display, edge to edge; 326 ppi; up to 2,000 nits maximum and 1 nit minimum brightness
Screen protectionIon-X front glassIon-X front glass (aluminium cases); sapphire front crystal (stainless steel cases)
Health and fitness
ECGNoYes
Blood oxygenNoYes
Skin temperatureNoYes
Sleep apnoea alertsNoYes
High blood pressure alertsNoYes
Body compositionNoNo
Fall detectionYesYes
Crash detectionYesYes
GPSSingle-bandSingle-band
Water resistance50 m50 m
SensorsSecond-generation optical heart sensor; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensorElectrical heart sensor; third-generation optical heart sensor; temperature sensing; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensor
Health featuresHeart Rate app; high and low heart rate notifications; irregular rhythm notifications; Sleep app with sleep stages; Medications; Mindfulness; NoiseECG app; Blood Oxygen app; sleep apnoea notifications and hypertension notifications (added in later watchOS updates); irregular rhythm notifications; high and low heart rate notifications; sleep stages; Cycle Tracking with retrospective ovulation estimates; Medications; Mindfulness; Noise
Fitness featuresCustom interval workouts; Training Load; Heart Rate Zones; Race Route; Pacer; stride length, ground contact time and vertical oscillation; automatic track detection; multisport workouts; Backtrack and offline maps; pool and open-water swimming with SWOLF; cycling Functional Threshold Power and Power Zones with Bluetooth accessories; GymKitCustom interval workouts; Heart Rate Zones; Race Route; stride length, ground contact time and vertical oscillation; automatic track detection; multisport workouts; Backtrack; pool and open-water swimming with SWOLF and automatic stroke detection; cycling Functional Threshold Power, power zones and cadence with Bluetooth accessories; GymKit
Safety featuresEmergency SOS; international emergency calling; Crash Detection; Fall Detection; noise monitoring; BacktrackEmergency SOS; international emergency calling; Crash Detection; Fall Detection
Battery and connections
Battery life (maker's claim)Up to 18 hoursUp to 18 hours
In low-power mode–Up to 36 hours
Mobile data optionYesYes
Works withiPhoneiPhone
ChipS8S9
Storage32 GB64 GB
Battery life detailUp to 18 hours of normal useBuilt-in rechargeable lithium-ion battery
ChargingUp to 80% in about 1.5 hours with the Apple Watch Magnetic Charger to USB-C CableFast charging to 80% in about 45 minutes
ConnectivityWi-Fi 4 (802.11n); Bluetooth 5.3; Apple Pay; L1 GPS, GNSS, Galileo and QZSS; 4G LTE and UMTS on GPS + Cellular models; works with iPhone Xs or later on iOS 18 or laterL1 GPS, GNSS, Galileo and BeiDou; 4G LTE and UMTS (GPS + Cellular models); Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip with Precision Finding for iPhone 15 and later; Apple Pay
Storage32GB–
Design
Weight (lightest version)26.4 g31.9 g
SoftwarewatchOSwatchOS
Case materials100% recycled aluminium case with a nylon composite back; water resistant to 50 m (swimproof)Aluminium or stainless steel case; water resistant to 50 m (swimproof); IP6X dust resistant
Size40 mm is 40 x 34 x 10.7 mm, 26.4 g (GPS) or 27.8 g (GPS + Cellular); 44 mm is 44 x 38 x 10.7 mm, 32.9 g (GPS) or 33 g (GPS + Cellular)41mm is 41 x 35 x 10.7 mm, 31.9 g (aluminium, GPS), 32.1 g (aluminium, GPS + Cellular) or 42.3 g (stainless steel); 45mm is 45 x 38 x 10.7 mm, 38.7 g (aluminium, GPS), 39.0 g (aluminium, GPS + Cellular) or 51.5 g (stainless steel); lightest is the 41mm aluminium GPS
BandsFits 130–200 mm wrists (40 mm) or 140–245 mm wrists (44 mm)Fits 130–200 mm wrists (41mm) or 140–245 mm wrists (45mm)
ColoursMidnight, Starlight or Silver aluminiumAluminium in Pink, Midnight, Starlight, Silver and (PRODUCT)RED; stainless steel in Gold, Silver and Graphite
In the boxApple Watch SE, strap, Apple Watch Magnetic Charger to USB-C Cable (1 m)Apple Watch Series 9, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)

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