LogTen on iOS uses different colors to identify different types of entries. The color of the text and background shading in the logbook flight list all have designations.
Text Color
Orange = flights on your device signify scheduled flights (flights that have not been flown).
Light Grey = flights are locked and can't be changed without first unlocking them.
Black = flight is unlocked.
Background Shading
White = Entry has the **Pilot Flying** field checked
Grey = Entry is not marked as **Pilot Flying**
If you do not see all the Logbook options (e.g. Pilot Flying), please take a look at the Configuring Your Logbook article.