Here are the table comparisons among OBDSTRA X300 Pro3 Key Master, OBDSTAR X100 Pro and SuperOBD SKP900 auto key programmer.
Tab. 1
OBDSTAR X300 Pro3 (Key Master) vs. SKP-900
| S/N | Feature&Function | OBDSTAR X300 Pro3 | SKP900 Key Programmer | 
| Image |  |  | |
| Hardware | New design in appearance | **** | *** | 
| Three-proof design(Water-proof,Shock-proof,Crash-proof), multi-angle shock resistance | **** | * | |
| Industrial screen, clear vision | **** | *** | |
| Humanizing design, convenient operation | **** | **** | |
| Latest PCB technology, quick download speed | **** | *** | |
| Silicon button, comfortable touch | **** | *** | |
| Software & Upgrade | OBDII function | √ | × | 
| More cars can be supported to adjust mileage | |||
| More ECU matching function deployed with, for example, to replace Toyota/Mit ECM | **** | ** | |
| More qualified and stable, and rarely occurs communication failed, For example, matching proximity of HYUNDAI KIA | **** | **** | |
| The most coverage of Chinese cars | **** | **** | |
| Optional choice offered, such as OIL/SERVICE,EPB and Battery Matching | **** | *** | |
| One key upgrade, single model upgrade supported | √ | × | |
| Subaru can be supported | √ | × | |
| EEPROM/read pin code, initialization,data recovery | √ | × | |
| Ferrari can be supported | × | √ | |
| Immo | √ | √ | 
Remark:
Five star is the top level
Tab. 2
OBDSTAR Key Master vs. OBDSTAR X100 Pro
| S/N | Feature&Function | OBDSTAR Key Master | OBDSTAR X-100 Pro | 
| Image |  |  | |
| Hardware | New design in appearance | **** | *** | 
| Three-proof design(Water-proof,Shock-proof,Crash-proof), multi-angle shock resistance | **** | ** | |
| Industrial screen, clear vision | **** | ** | |
| Humanizing design, convenient operation | **** | *** | |
| Latest PCB technology, quick download speed | **** | ** | |
| Silicon button, comfortable touch | **** | ** | |
| Software& Upgrade | Immo | √ | √ | 
| Mileage | √ | √ | |
| EEPROM | √ | √ | |
| OBDII function | √ | √ | |
| Enable/disable keys for Benz and BMW | √ | × | |
| PAS Pin code reader/Programmer/Mileage | √ | × | |
| Support the latest version of Mazda CX-3,CX-5,Mazda 2/3/6 and no need Pin code anymore | √ | × | |
| Optional choice offered, such as OIL/SERVICE,EPB and Battery Matching | √ | × | |
| One key upgrade, single model upgrade supported | √ | √ | 
http://www.key-programmer.org/2016/09/27/obdstar-x300-pro3-skp900-x100-pro-table-comparison/


















