Secret Diary with lock is a free Android app developed by SphereLix Apps. It is a private diary that allows users to lock their secrets with a password. The app allows users to organize all their secrets, feelings, thoughts, experiences, and memories in one place. Users can even password protect their thoughts/ideas for added security. The app has a material design dashboard that gives it a completely new look UI.

One of the best features of the Secret Diary with lock app is the availability of different themes (pink, purple, green, black, etc.) to choose from. Users can enable the password lock in the settings to ensure that their diary is totally secure. The app has added security features that allow users to have security checks as per their need. It is easy to add or delete notes, just click on the calendar. Users can also attach and add pictures or photos to the diary entry. The app has a search function that allows users to search their journal through text, mood, and calendar filters. All data is kept in the calendar and list.