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Comparison winner
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32 facts in comparison

Apple Watch SE 3 vs OnePlus Watch 4

This comparison puts the Apple Watch SE 3 and OnePlus Watch 4 side by side — two smartwatches measured against the same 32-spec sheet, with every meaningful gap scored and explained. On our weighted VS Score the OnePlus Watch 4 finishes ahead, 85 to 64 — a decisive result.

The single biggest measurable gap is battery life: 18 h vs 120 h. None of our retail partners currently lists the OnePlus Watch 4, so availability may be limited and price cannot factor into this comparison.

DesignDisplayHealth &fitnessBatteryConnectivitySoftware

Tap a category to see which one wins it.

64Points
85Points

Where the OnePlus Watch 4 beats the Apple Watch SE 3

  • 3.4 mm more case size ?47.4 mm vs 44 mm
  • 18 px more resolution ?466 px vs 448 px
  • 2,000 nits more peak brightness ?3,000 nits vs 1,000 nits
  • Has blood oxygen (SpO2) ?
  • Has ECG ?
  • 102 h more battery life ?120 h vs 18 h
  • Has dual-frequency GPS ?
Scroll down for more details

Key real-world differences

The spec sheet pulls in both directions. These are the gaps big enough to shape the decision — with the actual figures, and what each one means in real-world use.

  1. Battery lifeBattery
    18 h vs 120 h — 6.7× more for the OnePlus Watch 4

    Estimated hours of use between charges.

  2. Blood oxygen (SpO2)Health & fitness
    No vs Yes — only the OnePlus Watch 4 has it

    Measures blood-oxygen saturation.

  3. ECGHealth & fitness
    No vs Yes — only the OnePlus Watch 4 has it

    Takes an electrocardiogram to check heart rhythm.

  4. Peak brightnessDisplay
    1,000 nits vs 3,000 nits — 3× more for the OnePlus Watch 4

    A brighter screen is easier to read in sunlight.

  5. Dual-frequency GPSConnectivity
    No vs Yes — only the OnePlus Watch 4 has it

    L1+L5 GPS gives more accurate tracking in cities and forests.

Which one should you buy?

There is no single answer — it depends on what you will actually use it for. Match your priority to the pick below.

  • Best for health & fitness OnePlus Watch 4 takes the category 100 to 71 — driven by blood oxygen (SpO2) (No vs Yes).
  • Best for design Apple Watch SE 3 takes the category 88 to 67 — driven by weight (26.4 g vs 43 g).
  • Best for battery OnePlus Watch 4 takes the category 100 to 24 — driven by battery life (18 h vs 120 h).
  • Best for display OnePlus Watch 4 takes the category 67 to 33 — driven by peak brightness (1,000 nits vs 3,000 nits).
  • Best for software Apple Watch SE 3 takes the category 100 to 0 — driven by onboard storage (64 GB vs 32 GB).
  • The safe all-rounder OnePlus Watch 4 wins more of the categories that carry real weight, topping the overall VS Score at 85.

Where each one falls short

Apple Watch SE 3

  • Battery life: 18 h vs 120 h
  • Blood oxygen (SpO2): No vs Yes
  • ECG: No vs Yes
  • 1 spec is unreported (shown as Unknown) and excluded from its scores.

OnePlus Watch 4

  • Weight: 26.4 g vs 43 g
  • Onboard storage: 64 GB vs 32 GB
  • Display size: 1.78 " vs 1.5 "
  • 3 specs are unreported (shown as Unknown) and excluded from its scores.

What matters to you?

Drag the sliders to weight each category and re-rank the products to suit your priorities.

Design
Display
Health & fitness
Battery
Connectivity
Software
Your ranking
Apple Watch SE 3Your pick66
OnePlus Watch 4Your pick80

Score breakdown

Design
Apple Watch SE 388
OnePlus Watch 467
Decided by weight (26.4 g vs 43 g) and case size (44 mm vs 47.4 mm).
Display
Apple Watch SE 333
OnePlus Watch 467
Decided by peak brightness (1,000 nits vs 3,000 nits) and display size (1.78 " vs 1.5 ").
Health & fitness
Apple Watch SE 371
OnePlus Watch 4100
Decided by blood oxygen (SpO2) (No vs Yes) and ECG (No vs Yes).
Battery
Apple Watch SE 324
OnePlus Watch 4100
Decided by battery life (18 h vs 120 h).
Connectivity
Apple Watch SE 382
OnePlus Watch 480
Decided by dual-frequency GPS (No vs Yes) and Bluetooth version (5.3 vs 5.2).
Software
Apple Watch SE 3100
OnePlus Watch 40
Decided by onboard storage (64 GB vs 32 GB).

How the VS Score works — and what it can’t tell you

Every measurable spec is scored relative to this matchup: the best value here earns 100%, the worst 0%, and everything between scales linearly. Each spec then counts according to an editorial weight that reflects real-world impact — a battery-capacity gap moves the score far more than a colour-options list. The category scores above are the weighted results inside each group, and the overall VS Score rolls all of them together; the evidence line under each category names the specs that actually decided it.

Unknown values are never estimated. A spec a product doesn’t report simply drops out of that product’s scoring — it isn’t penalised with a guess — and a spec only one side reports can never produce a “win”. The trade-off is honest but real: a thinner spec sheet means a score built on fewer data points, which is why the completeness figures are disclosed under About this data.

Most importantly: a spec-sheet lead is not the same as a better product. Megapixels, gigahertz and benchmark points describe capacity, not experience — image processing, software optimisation, thermals, haptics and ergonomics decide how a device actually feels, and no table captures reliability or long-term support quality. Treat the scores as a structured summary of what can be measured, read the caveats under each key difference, and use the weight tuner to re-rank the comparison by what matters to you.

Design

Weight ?
26.4 g
43 g

A lighter watch is more comfortable to wear all day.

Case size ?
44 mm
47.4 mm

The case diameter; larger cases fit bigger displays, smaller ones suit slimmer wrists.

Case material ?
Glass front
Glass front (Sapphire crystal)

The case material (e.g. aluminium, titanium).

Water resistance ?
5 ATM
5 ATM

A higher ATM rating allows swimming and diving.

Always-on display ?
Apple Watch SE 3
? Unknown (OnePlus Watch 4)

Shows the time and stats without raising your wrist.

Sapphire glass ?
Apple Watch SE 3
OnePlus Watch 4

A scratch-resistant sapphire crystal protects the screen.

Colors ?
Midnight, Starlight
Midnight Titanium, Evergreen Titanium

The case and band colour options the watch is sold in.

Display

Display size ?
1.78 "
1.5 "

A larger display is easier to read and interact with.

Resolution ?
448 px
466 px

A higher pixel count produces sharper text and graphics.

Display type ?
Retina LTPO OLED
LTPO AMOLED

The screen technology (e.g. AMOLED).

Peak brightness ?
1,000 nits
3,000 nits

A brighter screen is easier to read in sunlight.

Health & fitness

Heart rate monitor ?
Apple Watch SE 3
OnePlus Watch 4

Continuously tracks your heart rate.

Blood oxygen (SpO2) ?
Apple Watch SE 3
OnePlus Watch 4

Measures blood-oxygen saturation.

ECG ?
Apple Watch SE 3
OnePlus Watch 4

Takes an electrocardiogram to check heart rhythm.

Blood pressure ?
Apple Watch SE 3
OnePlus Watch 4

Estimates blood pressure from the wrist.

Sleep tracking ?
Apple Watch SE 3
OnePlus Watch 4

Monitors sleep stages and quality.

Built-in GPS ?
Apple Watch SE 3
OnePlus Watch 4

Tracks routes and distance without a phone.

Skin temperature ?
Apple Watch SE 3
OnePlus Watch 4

Senses skin temperature for health insights.

Fall detection ?
Apple Watch SE 3
OnePlus Watch 4

Detects hard falls and can call for help.

Sport modes ?
? Unknown (Apple Watch SE 3)
100

More tracked workout types suit more activities.

Battery

Battery life ?
18 h
120 h

Estimated hours of use between charges.

Fast charging ?
Apple Watch SE 3
OnePlus Watch 4

Tops up quickly from empty.

Wireless charging ?
Apple Watch SE 3
? Unknown (OnePlus Watch 4)

Charges on a wireless pad or puck.

Charging time ?
45 min
75 min

How long a full charge takes; lower is better.

Connectivity

Bluetooth version ?
5.3
5.2

A newer Bluetooth version improves range and efficiency.

Wi-Fi ?
Apple Watch SE 3
OnePlus Watch 4

Connects to Wi-Fi for updates and sync without a phone.

Dual-frequency GPS ?
Apple Watch SE 3
OnePlus Watch 4

L1+L5 GPS gives more accurate tracking in cities and forests.

LTE / cellular ?
Apple Watch SE 3
OnePlus Watch 4

Make calls and stream without your phone nearby.

NFC payments ?
Apple Watch SE 3
OnePlus Watch 4

Pay contactlessly from your wrist.

Speaker & microphone ?
Apple Watch SE 3
? Unknown (OnePlus Watch 4)

Take calls and use a voice assistant on the watch.

Software

Operating system ?
watchOS 26
OxygenOS Watch 8 + Wear OS 6.0

The watch software platform.

Onboard storage ?
64 GB
32 GB

More storage holds more offline music and apps.

About this data

  • Specifications are compiled from each manufacturer’s official spec sheet, cross-checked against trusted specification databases, and normalised into one schema so identical things are compared identically.
  • Specifications last verified July 8, 2026.
  • Data completeness: Apple Watch SE 3 97% and OnePlus Watch 4 91% of the 32 specs in this category. Anything we could not verify is shown as Unknown — never estimated — and is excluded from all scores.
  • Prices and availability come from live retailer feeds via our shopping partners and refresh throughout the day; a missing price means no partner currently lists the product, not that it is discontinued.
  • Want the full picture? Our editorial guidelines explain how we research products, weight the scores and stay independent.
  • Spotted an error in a spec? Tell us and we will correct the sheet.

Where to buy

Apple Watch SE 3
Amazon.com
$ 219.99$ 249-12%
OnePlus Watch 4

No price is available to track yet.

Prices and availability may change. Check the retailer before buying. We may earn a commission on purchases.

What reviewers say

The bottom line

The OnePlus Watch 4 is the clear winner, scoring 85 to 64 on our VS Score. It leads on Display, Health & fitness and Battery. The Apple Watch SE 3 answers back with stronger Design, Connectivity and Software. Pick the OnePlus Watch 4 unless Design and Connectivity matters most to you — then the Apple Watch SE 3 is the smarter buy.

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