Drivers Daily Log is a replacement for the paper logbook used by some commercial drivers. Drivers Daily Log is not an ELD as required by current FMCSA law but may be used by certain EXEMPT carriers such as RV Transport Drivers and others. Drivers Daily Log is an e-log mobile app that can be used to create RODS (Records of Duty Status), which can then be signed, emailed and/or printed.
Downloading the Drivers Daily Log app is free but after your first 30 pages, you will need to purchase more. Additional pages only cost a few cents each and can be purchased within the app. You can see your current page count and purchase more on the setting screen.
To comply with the law, you will still have to produce paper copies of your logs when requested by law enforcement. This will require that you keep a working printer with you while you are driving. A list of iPhone/iPad compatible printers can be found at https://support.apple.com/en-us/HT201311