Amazfit T-Rex 3 vs OnePlus Watch 4: which one suits you?
The two differ in 6 of the specs we have recorded (prices checked 5 Nov 2026).
Which one should you choose?
Choose the
Amazfit T-Rex 3 if you care about:- Charge less often through the week (27 days vs 16 days)
- Higher water resistance for swimming and showers (10 ATM vs 5 ATM)
Choose the
OnePlus Watch 4 if you care about:- Has ECG; the other doesn't
- Lower weight: 43 g vs 68 g
The deciding difference here: battery life and ECG.
Compares recorded specs; a missing spec does not mean the feature is absent.
Smartwatches · OnePlus
OnePlus Watch 4- Case size:
- 47 mm
- Display type:
- LTPO OLED
- Reference price:
- SAR 1,092
Key differences
Case size
48 mm47 mmDisplay type
AMOLEDLTPO OLEDBattery life
✓ 27 days16 days
Specifications side by side
17 of 17 specs
Scroll the table sideways to see the rest.
| Spec | | |
|---|---|---|
| Reference price | SAR 1,072 | SAR 1,092 |
| Battery life | ✓ 27 days | 16 days |
| Phone compatibility | — | Smartphone |
| Built-in GPS | Yes | Yes |
| Cellular (LTE/eSIM) | Yes | Yes |
| Case size | 48 mm | 47 mm |
| Display type | AMOLED | LTPO OLED |
| Water resistance | ✓ 10 ATM | 5 ATM |
| Weight | 68 g | ✓ 43 g |
| Display size | 1.5 in | 1.5 in |
| ECG | No | ✓ Yes |
| Heart-rate tracking | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Contactless payment (NFC) | Yes | Yes |
| Release year | 2024 | — |
| Dimensions | — | 11 x 47 x 47 millimeters cm |
| dust resistance rating | IP68 | — |
| App control (Wi-Fi) | Yes | — |
Facts come from each Amazon.sa listing. As an Amazon Associate we earn from qualifying purchases. Buying through our links costs you nothing extra.
Before you buy
Prices, availability, shipping and returns can change. Check the final details on Amazon.sa before you buy.
Similar comparisons
Direct comparison questions
What is the difference in battery life between the Amazfit T-Rex 3 and the OnePlus Watch 4?
Battery life is higher on the Amazfit T-Rex 3: 27 days vs 16 days on the OnePlus Watch 4. If this spec is your priority, the difference favours it.
What is the difference in cellular (LTE/eSIM) between the Amazfit T-Rex 3 and the OnePlus Watch 4?
No difference here: cellular (LTE/eSIM) is Yes on both.
What is the difference in built-in GPS between the Amazfit T-Rex 3 and the OnePlus Watch 4?
No difference here: built-in GPS is Yes on both.
What is the difference in case size between the Amazfit T-Rex 3 and the OnePlus Watch 4?
Amazfit T-Rex 3: 48 mm; OnePlus Watch 4: 47 mm. A higher value is not necessarily better for you.