Apple Watch SE 3

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Apple's best-value smartwatch, now with an Always-On Retina display, the fast S10 chip, and a new wrist temperature sensor for health insights. Includes Crash Detection and Sleep Score, though it skips the ECG and blood oxygen sensors found on the Series 11.

$275

Color

Case Size

Specifications

Network

Technology: GSM / HSPA / LTE / 5G (Cellular models)
5G bands: SA/NSA
Speed: HSPA, LTE, 5G

Launch

Announced: 2025, September 09
Status: Available. Released 2025, September 19

Body

Case sizes: 40mm, 44mm
Dimensions (40mm): 40 x 34 x 10.7 mm
Dimensions (44mm): 44 x 38 x 10.7 mm
Weight (40mm): 26.3g (GPS) / 26.4g (GPS+Cellular)
Weight (44mm): 32.9g (GPS) / 33.0g (GPS+Cellular)
Build: Glass front (Ion-X, 4x more crack resistant than SE 2), plastic/sapphire crystal back, aluminum frame
Colors: Starlight, Midnight (only 2 — dropped Silver from lineup)
SIM: eSIM (Cellular models)
Water resistance: 50m

Display

Type: Retina LTPO OLED, Always-On, 1000 nits (peak), dims to 2 nits at night
Size: 1.78 inches (44mm)
Resolution: 368 x 448 pixels, 40mm: 324 x 394 pixels (~326 ppi density)

Platform

OS: watchOS 26
Chipset: Apple S10 (same chip as Series 11 and Ultra 3)
CPU: 64-bit dual-core

Memory

Internal: 64GB

Comms

Bluetooth: Yes
Cellular: 5G (Cellular models)

Features

Sensors: Optical heart sensor, wrist temperature sensor (new for SE 3)
Health: Vitals app, Sleep Score, sleep apnea notifications, Cycle Tracking with retrospective ovulation estimates
Note: Does NOT include ECG or blood oxygen sensors (Series 11/Ultra 3 exclusive)
Safety: Crash Detection, Emergency SOS
Controls: Digital Crown with haptic feedback, Side button, double-tap and wrist-flick gestures, on-device Siri