VersusScout
32 facts in comparison
OnePlus Watch 4 vs OnePlus Watch 3 43mm
This comparison puts the OnePlus Watch 4 and OnePlus Watch 3 43mm 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, 95 to 64 — a decisive result.
The single biggest measurable gap is battery life: 120 h vs 60 h.
Where the OnePlus Watch 4 beats the OnePlus Watch 3 43mm
- 4.2 mm more case size ?47.4 mm vs 43.2 mm
- Has sapphire glass ?
- 0.18 " more display size ?1.5 " vs 1.32 "
- 2,000 nits more peak brightness ?3,000 nits vs 1,000 nits
- Has ECG ?
- Has skin temperature ?
- 60 h more battery life ?120 h vs 60 h
Where the OnePlus Watch 3 43mm beats the OnePlus Watch 4
- 5.2 g less weight ?37.8 g vs 43 g
- 15 min less charging time ?60 min vs 75 min
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.
- Battery lifeBattery120 h vs 60 h — 2× more for the OnePlus Watch 4
Estimated hours of use between charges.
- ECGHealth & fitnessYes vs No — only the OnePlus Watch 4 has it
Takes an electrocardiogram to check heart rhythm.
- Peak brightnessDisplay3,000 nits vs 1,000 nits — 3× more for the OnePlus Watch 4
A brighter screen is easier to read in sunlight.
- Sapphire glassDesignYes vs No — only the OnePlus Watch 4 has it
A scratch-resistant sapphire crystal protects the screen.
- Skin temperatureHealth & fitnessYes vs No — only the OnePlus Watch 4 has it
Senses skin temperature for health insights.
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 80 — driven by ECG (Yes vs No).
- Best for battery OnePlus Watch 4 takes the category 100 to 17 — driven by battery life (120 h vs 60 h).
- Best for display OnePlus Watch 4 takes the category 100 to 33 — driven by peak brightness (3,000 nits vs 1,000 nits).
- The safe all-rounder OnePlus Watch 4 wins more of the categories that carry real weight, topping the overall VS Score at 95.
Where each one falls short
OnePlus Watch 4
- Weight: 43 g vs 37.8 g
- 3 specs are unreported (shown as Unknown) and excluded from its scores.
OnePlus Watch 3 43mm
- Battery life: 120 h vs 60 h
- ECG: Yes vs No
- Peak brightness: 3,000 nits vs 1,000 nits
- 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.
Score breakdown
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
A lighter watch is more comfortable to wear all day.
The case diameter; larger cases fit bigger displays, smaller ones suit slimmer wrists.
The case material (e.g. aluminium, titanium).
A higher ATM rating allows swimming and diving.
Shows the time and stats without raising your wrist.
A scratch-resistant sapphire crystal protects the screen.
The case and band colour options the watch is sold in.
Display
A larger display is easier to read and interact with.
A higher pixel count produces sharper text and graphics.
The screen technology (e.g. AMOLED).
A brighter screen is easier to read in sunlight.
Health & fitness
Continuously tracks your heart rate.
Measures blood-oxygen saturation.
Takes an electrocardiogram to check heart rhythm.
Estimates blood pressure from the wrist.
Monitors sleep stages and quality.
Tracks routes and distance without a phone.
Senses skin temperature for health insights.
Detects hard falls and can call for help.
More tracked workout types suit more activities.
Battery
Estimated hours of use between charges.
Tops up quickly from empty.
Charges on a wireless pad or puck.
How long a full charge takes; lower is better.
Connectivity
A newer Bluetooth version improves range and efficiency.
Connects to Wi-Fi for updates and sync without a phone.
L1+L5 GPS gives more accurate tracking in cities and forests.
Make calls and stream without your phone nearby.
Pay contactlessly from your wrist.
Take calls and use a voice assistant on the watch.
Software
The watch software platform.
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: OnePlus Watch 4 91% and OnePlus Watch 3 43mm 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.
What reviewers say
The bottom line
The OnePlus Watch 4 is the clear winner, scoring 95 to 64 on our VS Score. It leads on Display, Health & fitness and Battery.
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