Xiaomi Watch S4 vs Xiaomi Watch S5
Xiaomi Watch S4 and Xiaomi Watch S5 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 17 fields, including 5 exact differences; it does not choose a winner.
Specifications side by side
| Field | Xiaomi Watch S4 | Xiaomi Watch S5 |
|---|---|---|
| Release year | 2025 | 2026 |
| Case sizes | 47 mm | 46 mm |
| Display | AMOLED 1.43" | AMOLED 1.48" (2,500 nits peak) |
| Brightness | 1500 nits (approx.) | 2500 nits |
| Battery, as listed | Up to 15 days | 12 days (user-measured) (approx.) |
| Operating system | Xiaomi HyperOS 2 | Xiaomi HyperOS 3 |
| Phone compatibility | Android, iPhone | Android, iPhone |
| Cellular connection | None (eSIM China-only) | None (eSIM China-only) |
| Water rating | 5ATM | 5ATM |
| Case material | Aluminum | Aluminum |
| GPS | Dual-frequency GNSS | Dual-frequency GNSS |
| Maps | No | No |
| Payment system | None listed | None listed |
| Plan requirement | Not required | Not required |
| Listed sensors and features | HRV, SpO2, Skin temperature | Sleep apnea, 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: Xiaomi Watch S4 lists 2025; Xiaomi Watch S5 lists 2026. The listed values are 1 years apart.
- Case sizes: Xiaomi Watch S4 lists 47 mm; Xiaomi Watch S5 lists 46 mm. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Display: Xiaomi Watch S4 lists AMOLED 1.43"; Xiaomi Watch S5 lists AMOLED 1.48" (2,500 nits peak).
- Operating system: Xiaomi Watch S4 lists Xiaomi HyperOS 2; Xiaomi Watch S5 lists Xiaomi HyperOS 3. The listed software descriptions are not a guarantee of the software version currently installed on an individual watch.
- Listed sensors and features: Xiaomi Watch S4 lists HRV, SpO2, Skin temperature; Xiaomi Watch S5 lists Sleep apnea, 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 phone compatibility: Android, iPhone.
- Both list cellular connection: None (eSIM China-only).
- Both list water rating: 5ATM.
- Both list case material: Aluminum.
- Both list gps: Dual-frequency GNSS.
- Both list maps: No.
- Both list payment system: None listed.
- Both list plan requirement: Not required.
- Both list safety features: Fall detection, SOS calling.
- Both list hardware flashlight: No.
Which one fits you
Xiaomi Watch S4 is listed as a smartwatch compatible with Android, iPhone. 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.
Xiaomi Watch S5 is listed as a smartwatch compatible with Android, iPhone. 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.
Related pages
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- Xiaomi Watch S5 specifications
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- All pair comparisons