vs
4.1Display3.9
5.0Health tracking5.0
2.5Smart features4.8
Dimensions
Size comparison
C21Redmi Watch 5 Active
| C21 | Redmi Watch 5 Active | Difference | |
|---|---|---|---|
| Height | 46.5 mm | 49.1 mm | −2.6 mm |
| Width | 46.5 mm | 40.4 mm | +6.1 mm |
| Thickness | 13 mm | 11.4 mm | +1.6 mm |
Drawn to the same scale from the official dimensions (front and side).
Why is C21 better than Redmi Watch 5 Active?
- Pixel density386 ppi vs 250 ppi+54%
- Resolution (width)360 px vs 320 px+12%
Why is Redmi Watch 5 Active better than C21?
- Screen size1.32″ vs 2″+52%
- SpeakerNo · C21: Yes
- Battery capacity300 mAh vs 470 mAh+57%
- Thickness13 mm vs 11.4 mm+14%
Specifications
Side by side
| Design & durability | ||
| Case size | 46 mm | 49 mm |
| Weight | — | 42.2 g |
| Thickness | 13 mm | 11.4 mm |
| Height | 46.5 mm | 49.1 mm |
| Width | 46.5 mm | 40.4 mm |
| Case material | — | Aluminium |
| Lens / cover glass | Corning Gorilla Glass | — |
| Strap material | — | TPU |
| Water resistance | — | 5 ATM |
| Ingress protection | IP68 | — |
| Water resistance (IPx) | IPx8 | — |
| Water rating (maker) | — | 50 m / 5 bar / 5 ATM |
| Colours | Black, Silver | Midnight Black, Matte Silver |
| Display | ||
| Screen size | 1.32″ | 2″ |
| Display technology | LCD | LCD |
| Panel | TFT LCD | IPS LCD |
| AMOLED / OLED display | No | No |
| Touchscreen | — | Yes |
| Resolution (width) | 360 px | 320 px |
| Resolution (height) | 360 px | 385 px |
| Pixel density | 386 ppi | 250 ppi |
| Peak brightness | — | 500 nits |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | — | 18 days |
| Battery capacity | 300 mAh | 470 mAh |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | — | Yes |
| Sleep tracking | — | Yes |
| Sensors | Accelerometer, heart rate, SpO2, blood pressure | Accelerometer, heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | No | No |
| Satellite systems | — | GPS, GLONASS, BDS, QZSS |
| Connectivity | ||
| NFC payments | No | No |
| LTE (cellular) | No | No |
| eSIM | No | No |
| Bluetooth | 5 | 5.3 |
| Smart features | ||
| Calls from the wrist | — | Yes |
| Speaker | No | Yes |
| Voice assistant | — | Yes |
| Platform | ||
| Operating system | Proprietary OS | HyperOS |
| Platform | Proprietary | Proprietary |
| Works with | — | iOS, Android |
