Tripper offers several features that set it apart from other mileage-tracking applications for the iPhone:

• A live GPS mileage tracking option that records your mileage while you drive.
• GPS-recorded trips can be interrupted and resumed for phone calls or other apps.
• Flexible data entry includes odometer start and stop readings.
• The "smart" odometer starts each new entry with the last highest-used value.
• The "Favorites" feature makes entering recurring entries quick and easy.
• Customizable categories allow for multiple clients and billing codes.
• Export a tab-delimited trip journal via email.