The Penzu phone diary app is presented as a notebook on the phone. Users can both record their activities by item, set reminders or even create a daily schedule. The application also has its own web version for you to view and browse your notes on the large screen more comfortably and quickly.
In case you are concerned about others opening your phone and reading your logs, Penzu has a user lock feature available. You can choose to lock the application or lock some of the content inside with a password.