Purchase price for app gives user 21 days of usage for any new diary started. You can extend use of a diary by purchasing additional subscriptions for 3, 6 or 12 months. Want to feel confident when an officer asks for your license and logbook? Logbook Checker is an application for Australian truck drivers which allow them to check their Driver Work Diary to make sure it complies with legal requirements. It will also tell you when you can drive next and how long you can drive for before your next break is due. And when you fill in your Driver Work Diary it will show you how to fill it in correctly.