OnePlus Watch 3 vs OnePlus Watch 4

OnePlus Watch 3 and OnePlus Watch 4 are 2025 and 2026 smartwatches from the same product line. This comparison separates the catalog's listed specifications from missing information and approximate values. It covers 18 fields, including 7 exact differences; it does not choose a winner.

Specifications side by side

Field	OnePlus Watch 3	OnePlus Watch 4
Release year	2025	2026
Case sizes	47 mm	46 mm
Display	LTPO AMOLED (2,200 nits)	AMOLED (600/1500/3000 nits)
Brightness	2200 nits	3000 nits
Battery, as listed	Up to 5 days · up to 16 days in power saver mode	Up to 5 days · up to 16 days in power saver mode
Operating system	Wear OS 5 (upgradeable to 6)	Wear OS 6 + OxygenOS Watch 8
Phone compatibility	Android	Android
Cellular connection	No eSIM	No eSIM
Water rating	5ATM + IP68	5ATM + IP68
Glass	Sapphire	Sapphire
Case material	Stainless steel + titanium bezel	Full titanium
GPS	Dual-frequency GNSS	Dual-frequency GNSS
Maps	No	No
Payment system	Google Wallet	Google Wallet
Plan requirement	Not required	Not required
Listed sensors and features	ECG, HRV, SpO2, Skin temperature	Sleep apnea, ECG, HRV, SpO2, Skin temperature
Safety features	Fall detection, SOS calling	Fall detection, SOS calling
Hardware flashlight	No	No

"Not listed" means the catalog has no usable value for that field. It does not mean the watch lacks the feature. Approximate values stay visible but do not support the difference count or numeric deltas.

Where they differ

Release year: OnePlus Watch 3 lists 2025; OnePlus Watch 4 lists 2026. The listed values are 1 years apart.
Case sizes: OnePlus Watch 3 lists 47 mm; OnePlus Watch 4 lists 46 mm. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
Display: OnePlus Watch 3 lists LTPO AMOLED (2,200 nits); OnePlus Watch 4 lists AMOLED (600/1500/3000 nits).
Brightness: OnePlus Watch 3 lists 2200 nits; OnePlus Watch 4 lists 3000 nits. The listed values are 800 nits apart.
Operating system: OnePlus Watch 3 lists Wear OS 5 (upgradeable to 6); OnePlus Watch 4 lists Wear OS 6 + OxygenOS Watch 8. The listed software descriptions are not a guarantee of the software version currently installed on an individual watch.
Case material: OnePlus Watch 3 lists Stainless steel + titanium bezel; OnePlus Watch 4 lists Full titanium. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
Listed sensors and features: OnePlus Watch 3 lists ECG, HRV, SpO2, Skin temperature; OnePlus Watch 4 lists Sleep apnea, ECG, HRV, SpO2, Skin temperature. This compares the listed feature names, not measurement accuracy, clinical usefulness or availability in a particular country.

Where they are the same

Both list battery, as listed: Up to 5 days · up to 16 days in power saver mode.
Both list phone compatibility: Android.
Both list cellular connection: No eSIM.
Both list water rating: 5ATM + IP68.
Both list glass: Sapphire.
Both list gps: Dual-frequency GNSS.
Both list maps: No.
Both list payment system: Google Wallet.
Both list plan requirement: Not required.
Both list safety features: Fall detection, SOS calling.
Both list hardware flashlight: No.

Which one fits you

OnePlus Watch 3 is listed as a smartwatch compatible with Android. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that the later generation is better in every respect.

OnePlus Watch 4 is listed as a smartwatch compatible with Android. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that the later generation is better in every respect.

OnePlus Watch 3 vs OnePlus Watch 4

Specifications side by side

Where they differ

Where they are the same

Which one fits you

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