Device comparison

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Device A

Watch Ultra 4

Apple · Smartwatch

Brand Model Open full profile →

Device B

Amazfit · Smartwatch

Brand Model Open full profile →

Complete comparison

Every available group and stored value, aligned by field.

Differences only

LAUNCH DATE3 fields

NETWORK1 field

Specification	Watch Ultra 4	T-Rex Dual Solar
Technology	5G RedCap / LTE	No cellular connectivity

BODY6 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Build	Grade 5 titanium	Sapphire glass front, Grade 5 titanium bezel and buttons, fiber-reinforced polymer frame, Grade 5 titanium and glass-ceramic back shell
Colors	Natural, Black	Basalt Black
Dimensions	49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)	51.4 mm case diameter; 16.9 mm thick with heart-rate sensor (14.5 mm without)
IP Rating	IP6X; 100m water resistance; recreational diving to 40m	10 ATM water resistance
Strap	—	Silicone
Weight	63.0 g natural; 63.1 g black	69 g (without strap)

DISPLAY6 fields

PLATFORM5 fields

MEMORY1 field

Specification	Watch Ultra 4	T-Rex Dual Solar
Internal	64GB	—

SOUND2 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Loudspeaker	Dual speakers; siren	Yes
Microphones	—	Yes

COMMUNICATION4 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Bluetooth	5.3	5.2, BLE (Bluetooth calls)
NFC	—	Yes, Zepp Pay contactless payments (European version, supported countries/regions)
Positioning	Dual-frequency GPS, Galileo, QZSS, BeiDou	Dual-band GNSS, six satellite systems
WLAN	Wi-Fi 4, 2.4/5GHz	Wi-Fi 2.4GHz

FEATURES2 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Health Features:	—	Blood-oxygen monitoring, Training Load, Training Effect, VO2 Max, recovery time, 180+ workout modes, automatic dive detection
Sensors	Electrical and optical heart sensors, blood oxygen, temperature, compass, altimeter, accelerometer, gyroscope, ambient light, depth, water temperature	BioTracker 6.0 PPG heart-rate sensor, barometric altimeter, compass, temperature sensor, gyroscope, accelerometer

BATTERY4 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Battery Life	—	Up to 25 days typical use; up to 41 hours in Accuracy GPS Mode; up to 34 days with front solar and up to 51 days with rear solar (3 hours a day at 50,000 lux); up to 180 days in Outdoor Extreme Mode with rear solar
Capacity	—	660 mAh
Charging Type	Wireless (magnetic fast charging), 0-80% in about 45 min; 15 min charge for up to 18 hours	Dual-sided solar charging (display and glass-ceramic back plate); USB Type-C-compatible charging base
Type	Rechargeable lithium-ion	—

ADDITIONAL INFORMATION6 fields

Specification	Watch Ultra 4	T-Rex Dual Solar
Compatibility	iPhone 11 or newer, or iPhone SE (2nd generation or newer), with iOS 27 or newer	Zepp App; Android 7.0 or later, iOS 15.0 or later. NFC contactless payments (Zepp Pay) only on the European version, in supported countries (31 European countries incl. UK, Germany, France)
Environmental	—	Packaging sleeve made from 100% recyclable materials; mineral-free inks; no extra cable in the box, to cut unneeded materials (Amazfit)
Launch Price (USD)	—	$649.99 (US launch)
Models	—	A2570
Models and regions	—	A2570 (one model for all markets; certified by the US FCC, Malaysia SIRIM, South Korea RRA, Indonesia SDPPI and the Eurasian Economic Union)
Price in Nigeria	₦1,119,000	₦910,000 (estimate, converted from US launch price)

TESTS1 field

Specification	Watch Ultra 4	T-Rex Dual Solar
Battery Endurance	—	Typical use: up to 25 days; heavy use: up to 13 days; Accuracy GPS mode: up to 41 h; trail running: up to 48 h (normal) / 33 h (heavy); Outdoor Extreme Mode: up to 40 days; low-temperature mode: 31 h sports / 26 days standby (Amazfit manufacturer figures, without solar)