| key specs |
| Strap Colour | Blue, Black, Pink Clay, Olive, Thistle | - |
| Compatible OS | Android, iOS | iOS, Android |
| Dial Shape | Square | Round |
| Display Type | AMOLED | AMOLED |
| Ideal For | Unisex | Unisex |
| Strap Material | - | Silicone |
| general |
| Brand | Fitbit | Amazfit |
| Model | Versa 3 | T-Rex Pro |
| Release date | August 25, 2020 | March 23, 2021 |
| Model Name | Versa 3 | Amazfit T-Rex Pro |
| Dial Shape | Square | Round |
| Size | Regular | Regular |
| Touchscreen | Yes | Yes |
| Water Resistant | Yes | 10 ATM |
| Water Resistance Depth | 50 meters | - |
| Ideal For | Unisex | Unisex |
| Strap Colour | Blue, Black, Pink Clay, Olive, Thistle | - |
| Strap Material | - | Silicone |
| Dial Material | - | Polycarbonate |
| Dial Colour | - | Desert Grey, Meteorite Black, Steel Blue |
| product details |
| Sensor | Accelerometer, Ambient light sensor, Gyroscope Built-in GPS + GLONASS, Altimeter, Optical heart rate sensor | Three-axis acceleration sensor, Heart Rate Sensor, BioTracker 2 PPG , ambient light sensor, Geomagnetic, three-axis gyroscope, barometric altimeter |
| Compatible Device | Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later | Android, iOS |
| Battery Type | Lithium-polymer | - |
| Battery Life | Around 6 days | 18 days |
| Notification | - | Yes |
| Charge Time | - | 1.5 hours |
| Charger Type | - | Magnetic 2-pins Pogo Pin |
| Rechargeable Battery | - | Yes |
| connectivity features |
| Call Function | Yes | - |
| Bluetooth | Yes | Yes |
| Wi-Fi | Yes | Yes |
| GPS | Yes | Yes |
| Other Connectivity Features | NFC | - |
| Bluetooth Version | - | 5.0 |
| platform and storage features |
| Compatible Operating System | Android, iOS | iOS, Android |
| Operating System | - | RTOS |
| camera and display features |
| Display Type | AMOLED | AMOLED |
| Display Resolution | - | 320x360 |
| Scratch Resistant | - | Tempered Glass + anti-fingerprint coating |
| fitness and watch functions |
| Step Count | Yes | Yes |
| Calorie Count | Yes | Yes |
| Heart Rate Monitor | Yes | Yes |
| Altimeter | Yes | Yes |
| Calendar | Yes | Yes |
| Alarm Clock | Yes | Yes |
| Date & Time Display | Yes | Yes |
| Language | English | English |
| Number of Buttons | - | 4 |
| Other Fitness Features | - | 100+ sports modes |
| Other Watch Functions | - | Heart rate monitoring, sleep quality monitoring |
| audio and video features |
| Speaker | Yes | Yes |
| Microphone | Yes | - |
| dimensions |
| Width | - | 47.7 |
| Height | - | 47.7 |
| Thickness | - | 13.5 |
| Weight (g) | - | 59.40 |