Comparison of all Apple Watch models What they all have in common Naturally, every version works with an iPhone. You’re able to take calls, receive notications and track your tness and health stats like your heart rate, calories burned and steps. OLED screen Accurate with automatic Gyroscope Accelerometer time-keeping Heart rate sensor brightness control They also all offer 1000 nit screen 40mm or 44mm Bluetooth Microphone brightness (with the Siri interchangeable and 2.4GHz and speaker exception of the rst bands wi connectivity two, which were only 450) What’s changed from the Apple Watch First Generation to the Series 6? The most notable change is where the Apple Watch Series 5 introduced us to the Always-on display Series 4 and 5 have a more rounded screen. Older versions are square. Noticeably better graphics on the later screens due to the increase in size. Features Apple Watch Series 6 Apple Watch SE Apple Watch Series 5 Apple Watch Series 4 Year released 2020 2020 2019 2018 Case Size 40mm or 44mm 40mm or 44mm 40mm or 44mm 38mm / 42mm Case thickness 10.7mm 10.7mm 10.7mm 11.4mm (excluding HRM) Aluminium, Aluminium, Aluminium, Aluminium, Case material Stainless Steel, Stainless Steel, Titanium Stainless Steel, Titanium Stainless Steel Titanium, Ceramic Rounded-corner, Rounded-corner, Screen description Rectangular, OLED Rectangular, OLED OLED OLED Screen brightness 1,000 nits 1,000 nits 1,000 nits 1,000 nits 44mm: 977 mm2 44mm: 977 mm2 Screen size 759 sq mm2 759 sq mm2 40mm: 759 mm2 40mm: 759 mm2 Screen resolution 324 x 394 pixels 324 x 394 pixels 394×324px 394×324px Water-resistance 50m 50m 50m 50m Battery life Up to 18 hours Up to 18 hours Up to 18 hours Up to 18 hours Wi, Bluetooth Wi, Bluetooth Wi, Bluetooth Wi, Bluetooth Connectivity (5.0), GPS (5.0), GPS (5.0), GPS (5.0), GPS LTE/Cellular option Yes Yes Yes Yes NFC Yes Yes Yes No On-board memory 32GB 32GB 32GB 16GB S6 SiP with S6 SiP with S5 SiP with S4 with 64-bit Processor 64-bit dual-core 64-bit dual-core 64-bit dual-core dual-core processor Always-On display Yes No Yes No Verbal Siri Yes Yes Yes Yes GPS Yes Yes Yes Yes GLONASS Yes Yes Yes Yes Accelerometer, Altimeter, Accelerometer, Altimeter, Accelerometer, Altimeter, Blood Oxygen, Compass, Compass, Compass, Barometer, ECG, Exercise Tracking, Exercise Tracking, Exercise Tracking, Electrical heart sensor, Sensors Gyroscope, Heart Rate, Gyroscope, Heart Rate, Gyroscope, Heart Rate, Optical heart sensor, Light, Menstrual Tracking, Light, Menstrual Tracking, Light, Menstrual Tracking, Accelerometer, Microphone, Motion, Microphone, Motion, Microphone, Motion, Gyroscope, Oxygen, Sleep Tracking, Sleep Tracking, Sleep Tracking, Ambient light sensor Health/Activity Health/Activity Health/Activity Available for purchase Yes Yes Yes No Price as of $369 $269 $429 April 2021 N/A Features Apple Watch Series 3 Apple Watch Series 2 Apple Watch Series 1 First Generation Year released 2017 2016 2015 2015 Case Size 38mm / 42mm 38mm / 42mm 38mm / 42mm 38mm / 42mm Case thickness 11.4mm 11.4mm 11.4mm 11.4mm (excluding HRM) Aluminium, Aluminium, Aluminium, Aluminium, Case material Stainless Steel Stainless Steel Stainless Steel Stainless Steel Squared-corner, Squared-corner, Squared-corner, Squared-corner, Screen description OLED OLED OLED OLED Screen brightness 1,000 nits 1,000 nits 450 nits 450 nits 38mm: 563 mm2 38mm: 563 mm2 38mm: 563 mm2 38mm: 563 mm2 Screen size 42mm: 740 mm2 42mm: 740 mm2 42mm: 740 mm2 42mm: 740 mm2 Screen resolution 340×272px 340×272px 340×272px 340×272px Water-resistance 50m 50m 1m splash-proof 1m splash-proof Battery life Up to 18 hours Up to 18 hours Up to 18 hours Up to 18 hours Wi, Bluetooth Wi, Bluetooth Wi, Bluetooth Wi, Bluetooth Connectivity (4.0), GPS (4.0), GPS (4.0), GPS (4.0), GPS LTE/Cellular option Yes No No No NFC Yes No Yes Yes On-board memory 8GB / 16GB 8GB 8GB 8GB S3 with S2 with S2 with S1 with Processor dual-core processor dual-core processor dual-core processor dual-core processor Always-On display No No No No Verbal Siri No No No No No GPS Yes Yes No GLONASS Yes No No No Barometer, Electrical heart sensor, Optical heart sensor, Optical heart sensor, Optical heart sensor, Accelerometer, Accelerometer, Sensors Optical heart sensor, Accelerometer, Gyroscope, Gyroscope, Accelerometer, Gyroscope, Ambient light sensor Ambient light sensor Gyroscope, Ambient light sensor Ambient light sensor Available for purchase Yes No No No Price as of $229 N/A N/A N/A April 2021.