Xiaomi Watch S1 vs Xiaomi Watch S4
Xiaomi Watch S1 and Xiaomi Watch S4 are 2022 and 2025 smartwatches from the same product line. This comparison separates the catalog's listed specifications from missing information and approximate values. It covers 18 fields, including 9 exact differences; it does not choose a winner.
Specifications side by side
| Field | Xiaomi Watch S1 | Xiaomi Watch S4 |
|---|---|---|
| Release year | 2022 | 2025 |
| Case sizes | 46 mm | 47 mm |
| Display | 1.43 in AMOLED 466x466 | AMOLED 1.43" |
| Brightness | 450 nits (approx.) | 1500 nits (approx.) |
| Battery, as listed | Up to 12 days | Up to 15 days |
| Operating system | MIUI Watch (RTOS) | Xiaomi HyperOS 2 |
| Phone compatibility | Android, iPhone | Android, iPhone |
| Cellular connection | None | None (eSIM China-only) |
| Water rating | 5ATM | 5ATM |
| Glass | Sapphire | Not listed |
| Case material | Stainless steel | 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 | Heart rate, SpO2 | HRV, SpO2, Skin temperature |
| Safety features | None listed | 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 S1 lists 2022; Xiaomi Watch S4 lists 2025. The listed values are 3 years apart.
- Case sizes: Xiaomi Watch S1 lists 46 mm; Xiaomi Watch S4 lists 47 mm. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Display: Xiaomi Watch S1 lists 1.43 in AMOLED 466x466; Xiaomi Watch S4 lists AMOLED 1.43".
- Battery, as listed: Xiaomi Watch S1 lists Up to 12 days; Xiaomi Watch S4 lists Up to 15 days. These are the full listed battery descriptions. Different modes or case variants prevent a single numeric battery-life delta.
- Operating system: Xiaomi Watch S1 lists MIUI Watch (RTOS); Xiaomi Watch S4 lists Xiaomi HyperOS 2. The listed software descriptions are not a guarantee of the software version currently installed on an individual watch.
- Cellular connection: Xiaomi Watch S1 lists None; Xiaomi Watch S4 lists None (eSIM China-only). Variant wording is retained. A cellular specification alone does not confirm activation with your mobile carrier.
- Case material: Xiaomi Watch S1 lists Stainless steel; Xiaomi Watch S4 lists Aluminum. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Listed sensors and features: Xiaomi Watch S1 lists Heart rate, SpO2; Xiaomi Watch S4 lists HRV, SpO2, Skin temperature. This compares the listed feature names, not measurement accuracy, clinical usefulness or availability in a particular country.
- Safety features: Xiaomi Watch S1 lists None listed; Xiaomi Watch S4 lists Fall detection, SOS calling.
Where they are the same
- Both list phone compatibility: Android, iPhone.
- Both list water rating: 5ATM.
- Both list gps: Dual-frequency GNSS.
- Both list maps: No.
- Both list payment system: None listed.
- Both list plan requirement: Not required.
- Both list hardware flashlight: No.
Which one fits you
Xiaomi Watch S1 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 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.
Information is missing on at least one side for: Glass. Those rows are excluded from the exact difference count.
Related pages
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