Apple Watch SE 3 (44 mm, GPS) / Apple Watch Series 6 (40 mm, GPS)

Apple Watch SE 3 (44 mm, GPS): 44 mm GPS · aluminium case (Midnight / Starlight)

Apple Watch Series 6 (40 mm, GPS): Apple Watch Series 6, 40 mm aluminium case, GPS (2020). The 44 mm and GPS + Cellular versions, stainless steel/titanium cases and the Nike and Hermès editions are separate.

Specification	Apple Watch SE 3 (44 mm, GPS)	Apple Watch Series 6 (40 mm, GPS)
Release year	2025	2020
Announcement	September 9, 2025; on sale from September 19, 2025 Apple	—
Case	44 mm aluminium; 44 × 38 × 10.7 mm A 40 mm version also exists with different size, display and battery values. Apple	—
Weight	32.9 g (GPS) Apple	—
Display	Always-On Retina, LTPO OLED; 368 × 448 pixels, 977 mm², 326 ppi Because the LTPO panel can lower its refresh rate, the display keeps showing the time and notifications with the wrist down; this is the first SE with Always-On. Apple	Always-On Retina LTPO OLED; 324 × 394 pixels, 759 mm² display area; 1000 nits The Always-On display keeps the time and complications visible with the wrist down. Apple
Brightness	1,000 nits peak; 2 nits minimum Apple	—
Front glass	Ion-X glass Apple claims 4x better crack resistance than the SE 2. Apple	—
Processor	Apple S10 SiP; 64-bit dual-core processor, 4-core Neural Engine The S10 enables the Always-On display, double tap and wrist flick gestures, on-device Siri and fast charging. Apple	—
Storage	64 GB Apple	32 GB Apple
Sensors	Second-generation optical heart sensor, temperature sensor, compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensor There is no ECG or blood oxygen sensor. The temperature sensor is not intended for medical use. Apple	—
Health features	Heart rate and rhythm notifications, sleep apnoea notifications, sleep stages and sleep score, cycle tracking Feature availability varies by country. Apple	—
Gestures	Double tap; wrist flick (watchOS 26) Wrist flick dismisses notifications and calls, silences alarms and returns to the watch face with one hand. Apple	—
Speaker	Yes; can play music and podcasts Apple	—
Water resistance	50 metres (ISO 22810:2010); swimproof Apple	50 metres (ISO 22810:2010) Suitable for shallow-water swimming in a pool or the sea, but not scuba diving, waterskiing or high-velocity water. Apple
Wireless	Wi-Fi 4 (802.11n, 2.4 GHz only); Bluetooth 5.3 Apple	Wi‑Fi 802.11b/g/n 2.4 and 5 GHz; Bluetooth 5.0 LTE and UMTS are only on GPS + Cellular models. Apple
Location	L1 GPS, GLONASS, Galileo, QZSS, BeiDou This is single-frequency (L1) GPS; position can drift under trees and between tall buildings. Apple	—
Battery life	Up to 18 hours of normal use; up to 32 hours in Low Power Mode In Apple's test the watch stays connected to an iPhone over Bluetooth throughout; results vary with use and settings. Apple	—
Charging	Fast charging: about 80% in 45 minutes; 15 minutes gives up to 8 hours of use Times are with the included Apple Watch Magnetic Fast Charger to USB-C Cable; no adapter is included. Apple	—
Compatibility	iPhone 11 or later, iPhone SE (2nd generation) or later Apple	Requires an iPhone 6s or later with iOS 14 or later Apple
Colour options	Midnight or Starlight aluminium case Apple	—
Case and version	—	40 mm aluminium case, GPS; Silver, Space Gray, Gold, Blue, (PRODUCT)RED Stainless steel and titanium cases were only sold in the GPS + Cellular version. The 44 mm model uses the same chip but has a different display and weight. Apple
Chip	—	S6 SiP with 64-bit dual-core processor; W3 wireless chip; U1 Ultra Wideband chip Ultra Wideband availability varies by region. Apple
Health sensors	—	Blood oxygen sensor (Blood Oxygen app), electrical heart sensor (ECG app), third-generation optical heart sensor Apple states Blood Oxygen measurements are not for medical use and are only designed for general fitness and wellness. The ECG app is not intended for people under 22. Apple
Other sensors and safety	—	Always-on altimeter, compass, accelerometer up to 32 g with fall detection, gyroscope, ambient light sensor; Emergency SOS On the GPS model, Emergency SOS needs the iPhone nearby; otherwise the watch must be on a known Wi‑Fi network with Wi‑Fi Calling on. International emergency calling is only on the cellular model. Apple
Battery and charging	—	Built-in lithium-ion battery; up to 18 hours; magnetic charging cable (1 m) The 18-hour figure comes from Apple’s August 2020 testing with pre-production watches paired to an iPhone; it varies with use. Apple
Other	—	Speaker, microphone, Apple Pay, GymKit; ceramic and sapphire crystal back Apple
Size and weight	—	40 × 34 × 10.7 mm; 30.5 g (aluminium, without band) Apple