RA Command Drag (3128C) is full tower race management for drag racing: class and driver registration, practice, qualifying and eliminations with 64-car NHRA style ladders, scoreboard control and timeslip customisation. It controls the timing system rather than sitting beside it. Supplied with a one hour remote training session.
RA Command AutoCross runs an autocross or solo event from one Windows app: live timing off the 3850 hardware timer, a run order that cycles drivers and enforces the run cap, registration, and class plus overall PAX standings ranked live. It works fully offline.
RA Monitor - Drag is deliberately much less. It is a scoreboard and a logger for an existing 2650: it displays both lanes and writes every run to a daily spreadsheet file, and it never sends a command to the timer. If you want PC control of the tree and the sensors, that is a Command Drag system, not a Monitor one.
All three are Windows desktop applications that run locally, with no cloud account and no connectivity needed at the venue.