Hi,
I can develop a shell or command prompt script (depending on OS you use) to retrieve data and do needed comparison between needed data points (additional command line parameters could let choose which data points to compare, but this would require simple sqlite db setuped). I could also help you do this automatically with task manager or crontab (again based on OS).
I quite recently started looking for jobs on freelancer, that is why I submit my proposal with the cheapest price, but I can assure you, you will get the job done with highest quality.
Regards,
Lukas