Some good mileage trackers include Mile Log+ and Auto Miles for iPhone. For Android users, TripLog is a good and free mileage tracking app that uses Bluetooth, GPS or a power source for tracking.
In order to deliver an accurate report, Auto Miles senses when the user is driving. Users can then export these reports as spreadsheets to use in their mileage reports. Mile Log+ uses the most current IRS data to track miles for business expenses, and the app can also track charity and medical miles. Not only can Android owners use their smartphone for tracking miles using TripLog, they can also cycle between devices using the app's fleet management feature.