vs
8.8Display5.8
9.2Health tracking8.6
8.0Sports & outdoor6.4
9.0Smart features8.3
8.4Build & durability4.0
Dimensions
Size comparison
Watch Series 9 AluminumWatch 4
| Watch Series 9 Aluminum | Watch 4 | Difference | |
|---|---|---|---|
| Height | 45 mm | 46.2 mm | −1.2 mm |
| Width | 38 mm | 46.2 mm | −8.2 mm |
| Thickness | 10.7 mm | 10.9 mm | −0.2 mm |
| Weight | 32 g | 48 g | −16 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Watch Series 9 Aluminum better than Watch 4?
- Weight31.9 g vs 48 g+50%
- Screen size1.9″ vs 1.5″+27%
- Storage64 GB vs 32 GB2×
- Pixel density326 ppi vs 310 ppi+5%
Why is Watch 4 better than Watch Series 9 Aluminum?
- Battery capacity308 mAh vs 530 mAh+72%
- Resolution (width)396 px vs 466 px+18%
Specifications
Side by side
| Design & durability | ||
| Case size | 45 mm | 46 mm |
| Weight | 31.9 g | 48 g |
| Thickness | 10.7 mm | 10.9 mm |
| Height | 45 mm | 46.2 mm |
| Width | 38 mm | 46.2 mm |
| Case material | Aluminium | Stainless steel |
| Sapphire crystal | Yes | — |
| Lens / cover glass | Ion-X strengthened glass | — |
| Strap material | — | Leder, Fluorelastomer |
| Water resistance | 5 ATM | 5 ATM |
| Ingress protection | IP6X | IP6X |
| Water rating (maker) | — | 50 m / 5 bar / 5 ATM |
| Colours | Midnight, Starlight, Silver, Pink, Red | Black |
| Display | ||
| Screen size | 1.9″ | 1.5″ |
| Display technology | OLED | AMOLED |
| Panel | Retina LTPO OLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Touchscreen | — | Yes |
| Resolution (width) | 396 px | 466 px |
| Resolution (height) | 484 px | 466 px |
| Pixel density | 326 ppi | 310 ppi |
| Peak brightness | 2,000 nits | — |
| LTPO display | Yes | — |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | — | 3 days |
| Battery capacity | 308 mAh | 530 mAh |
| Battery type | Li-Ion | Li-Ion |
| Wireless charging | Yes | Yes |
| Charged in 30 min | 53% | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | Yes | Yes |
| Skin temperature | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Sleep tracking | — | Yes |
| Sensors | Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, temperature (body) | Accelerometer, gyro, heart rate, barometer, compass, SpO2, thermometer (body temperature) |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GLONASS, GALILEO, BDS, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | — | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | Yes | Yes |
| eSIM | Yes | Yes |
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Bluetooth | 5.3 | 5.2 |
| Ultra Wideband | Yes | — |
| Smart features | ||
| Speaker | Yes | Yes |
| Voice assistant | — | Yes |
| Music on the watch | — | Yes |
| Storage | 64 GB | 32 GB |
| RAM | — | 2 GB |
| Platform | ||
| Operating system | watchOS 10 | HarmonyOS 3.0 |
| Platform | watchOS | HarmonyOS |
| Works with | — | iOS, Android |
| Chipset | Apple S9 | Qualcomm Snapdragon W5 Gen 1 |
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