A free app for Android, by Nick Apps Development.
This application is a diary that allows you to write down all the ideas, thoughts, and events that you have experienced, and protect it with a password. You can choose to write in a simple way or in a more elaborate way, depending on how much information you want to include.
All the information that you write down will be saved in the application. You can also export the records to a PDF document. The application allows you to choose a color scheme for the records. It is also possible to add the day, the date, the time, the location, and other information to the records.
You can also use the application to send a backup record to another device. To do this, you need to select "Backup records". After the backup is complete, you will be asked to send it to the device. This allows you to share the records between different devices.