Here a comparison table among AUTOPHIX OM127 vs AUTOPHIX OM123 vs AUTOPHIX OM121.
| Image |  |
 |
 |
| Product name | AUTOPHIX OM121 Universal OBDII Auto Code Reader | AUTOPHIX OM123 Universal OBDII Scanner | AUTOPHIX OM127 OBD2 Scanner |
| Price | $21.99 | $31.99 | $55 |
| Reads and displays DTCs | √ | √ | √ |
| Erases DTCs | √ | √ | √ |
| Reads live data stream | √ | √ | OBDII |
| Views freeze frame data | √ | OBDII | |
| I/M readiness status | √ | √ | OBDII |
| Displays live O2 sensor test data | |||
| Displays On-board monitor test results | |||
| Check Vehicle components work status | |||
| Retrieves vehicle information (VIN,CIN and CVN) | √ | √ | OBDII |
| Reads, records & playbacks live sensor data, DTC and freeze frame data | Reads, records & playbacks live sensor data | ||
| Fuel Economy Analysis | |||
| Trip information | |||
| Support JOBD protocol with check Japanese vehicles | √ | ||
| On-Screen live data graphing | |||
| Built-in code library | √ | √ | √ |
| Multilingual menu options and code definitions | √ | √ | √ |
| Color Screen | |||
| Smart 8 Line Display 128 x 64 easy-to-read backlit LCD display with adjustable contrast | √ | √ | |
| 16-pin OBD2 cable | √ | √ | √ |
| Durable Nylon Storage Case | |||
| CE, FCC, RoHS certification | √ | √ | √ |
| FREE internet updates via USB cable | √ |
As you can see, AUTOPHIX OM127/ OM123/ OM121 are the cheap alternative of Autel AutoLink, Launch Creater. They can be a must-have basic OBDII code scanners for the DIYers.