Technology glossary
The Apple Watch operating system version released on September 15, 2025.
Apple released watchOS 26 on September 15, 2025. It brings the Liquid Glass design and a sleep score.
Hypertension notifications are offered on Apple Watch Series 9 and later and Ultra 2 and later. The wrist flick gesture is also supported on Apple Watch SE 3. Feature availability varies by model and region.
Smartwatches · 2025
The Apple Watch SE 3 is Apple's entry smartwatch: S10 chip, the first Always-On LTPO OLED display in the line, fast charging, a temperature sensor, sleep score and a speaker. It has no ECG or blood oxygen measurement, uses single-frequency GPS, its battery can be limited to about a day under heavy use, and it works only with an iPhone.
Smartwatches · 2025
Apple Watch Ultra 3 is Apple’s rugged smartwatch with a 49 mm titanium case. Its wide-angle OLED, LTPO3 display reaches 3000 nits and refreshes once per second in always-on mode. Alongside 5G RedCap cellular it offers satellite Emergency SOS and messaging, L1/L5 dual-frequency GPS, recreational diving to 40 m and up to 42 hours of normal battery life. An independent battery test matched Apple’s 42-hour figure; owners praise the display and battery, while some still find it large.