Who is the OnePlus Watch 3 for?
Entry-tier smartwatche. Below 58 on the Mars Score means several weighted specs trail the category leaders by a wide margin.
Only consider if there's a specific reason — price, brand loyalty, ecosystem fit. The best smartwatches page will show what your money buys at a higher tier.
Mars Score is computed from 17 measured specs against the transparent formula for the smartwatches category. No editorial picks, no paid placement.
Pros and cons at a glance
- ▲Always-on display — supported.
- ▲ECG — supported.
- ▲SpO2 — supported.
- ▲GPS — supported.
- ▼Cellular — not supported.
- ▼Battery life: 120 h (below category average).
Pros are specs scoring ≥75% of the category normalization range. Cons are ≤35%. Derived from the Mars Score formula — no hand-curated lists.
At a glance
- Display size
- 1.5"
- Case size
- 46.5mm
- Battery life
- 120h
- OS
- WearOS
All specifications
Design
- Case size
- 46.5 mm
- Weight
- 81 g
- Case material
- stainless steel
- Water resistance?
- 5 ATM
Display
- Display size
- 1.5 "
- Always-on display
- true
- Peak brightness?
- 2200 nits
Health & Fitness
- ECG
- true
- SpO2
- true
- Temperature sensor
- true
- Sleep tracking
- true
- Blood pressure
- false
Battery & Connectivity
- Battery life
- 120 h
- GPS
- true
- Cellular
- false
- NFC
- true
- OS
- WearOS
Latest from the lab
All lab reports →Popular comparisons featuring the OnePlus Watch 3
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