Cellphone App for tracking Mileage ie Rev Can/IRS

Hi Guys, so I got the dreaded letter from Rev Can (IRS Canada) ie full Audit. They are not happy/ satisfied with vehicle exp tracking/ mileage log or lack of it Does anyone use any cell phone App's for this? I am looking at "MileIQ" or "TripLog" I am on Andriod phone. Thxs