vs
2.0Battery life2.2
4.9Health tracking4.9
2.6Sports & outdoor2.8
6.5Smart features6.5
Dimensions
Size comparison
D2 AirForerunner 745
| D2 Air | Forerunner 745 | Difference | |
|---|---|---|---|
| Height | 43.2 mm | 43.8 mm | −0.6 mm |
| Width | 43.2 mm | 43.8 mm | −0.6 mm |
| Thickness | 12.4 mm | 13.3 mm | −0.9 mm |
| Weight | 46 g | 47 g | −1 g |
Drawn to the same scale from the official dimensions (front and side).
Why is D2 Air better than Forerunner 745?
- GPS battery life20 h vs 16 h+25%
- Resolution (width)390 px vs 240 px+62%
- Pixel density325 ppi vs 200 ppi+62%
- Thickness12.4 mm vs 13.3 mm+7%
Why is Forerunner 745 better than D2 Air?
- Battery life (smartwatch mode)5 days vs 7 days+40%
- Sport profiles16 vs 30+88%
Specifications
Side by side
| Design & durability | ||
| Case size | 43 mm | 44 mm |
| Weight | 46.3 g | 47 g |
| Thickness | 12.4 mm | 13.3 mm |
| Height | 43.2 mm | 43.8 mm |
| Width | 43.2 mm | 43.8 mm |
| Case material | Stainless steel | Plastic / polymer |
| Sapphire crystal | No | No |
| Lens / cover glass | Corning® Gorilla® Glass 3 | Corning® Gorilla® Glass DX |
| Strap material | silicone and leather | silicone |
| Water resistance | — | 5 ATM |
| Water rating (maker) | — | 5 ATM |
| Display | ||
| Screen size | 1.2″ | 1.2″ |
| Display technology | — | Memory-in-pixel (transflective) |
| Panel | — | Sunlight-visible, transflective memory-in-pixel |
| AMOLED / OLED display | — | No |
| Always-on display | — | Yes |
| Resolution (width) | 390 px | 240 px |
| Resolution (height) | 390 px | 240 px |
| Pixel density | 325 ppi | 200 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 5 days | 7 days |
| GPS battery life | 20 h | 16 h |
| Wireless charging | No | No |
| Charging | Garmin proprietary plug charger | Garmin proprietary plug charger |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Temperature sensor | Yes | Yes |
| HRV tracking | — | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | GPS, GLONASS, Galileo, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor | GPS, GLONASS, Galileo, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Satellite systems | GLONASS, GALILEO | GLONASS, GALILEO |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | — | Yes |
| Sport profiles | 16 | 30 |
| Connectivity | ||
| NFC payments | Yes | Yes |
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| ANT+ sensors | Yes | Yes |
| Smart features | ||
| Music on the watch | Yes | Yes |
| Storage | — | 4 GB |
| Third-party apps | Yes | Yes |
| Platform | ||
| Operating system | Garmin OS | Garmin OS |
| Platform | Proprietary | Proprietary |
| Works with | iOS, Android | iOS, Android |
