| Foxwell Model | NT644 | NT644 Pro |
| Works on almost all electronic systems | √ | √ |
| OBDI and OBDII compatiblity | √ | √ |
| Reads and clear codes | √ | √ |
| Reads/records/graphs live sensor data | √ | √ |
| Freeze frame data | √ | √ |
| ECU information | √ | √ |
| Multilingual menu and codes | √ | √ |
| Code troubleshooters | √ | √ |
| Hot keys for quick access of data | √ | √ |
| Bi-directional control tests | √ | |
| EPB Service | √ | √ |
| Oil Light Reset | √ | √ |
| DPF Reset | √ | |
| SAS(Steering Angle Sensor Calibration) | ||
| Battery Configuration | √ | |
| TPS/TBA(Throttle Body Alignment) | √ | |
| Other Service Maintenance Function | √ | |
| 18-month free updates | √ | √ |
| Yearly Update Cost(beyond free period) | 100USD | 100USD |