My Diary is described as '- Journal, Diary, Daily Journal with Lock supports setting a diary password to protect the security of your memories and private journal. Sync your diary journal to Google Drive or Dropbox to ensure security and keep diary entries can be accessed on different devices'. There are more than 10 alternatives to My Diary for a variety of platforms, including Windows, Linux, Android, iPhone and Android Tablet. The best alternative is Joplin, which is both free and Open Source. Other great apps like My Diary are CherryTree (Free, Open Source), Trilium Notes (Free, Open Source), RedNotebook (Free, Open Source) and Notezilla (Paid).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
RedNotebook is a graphical diary and journal helping you keep track of notes and thoughts. It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries.
Colorful & powerful sticky notes app for Windows & Phones. Set reminder alarms, attach them to any website or document, organize them using folders/tags, sync sticky notes between devices & send notes across LAN or to any contact across the globe.
A simplified, RedNotebook-type journal/diary app. With a focus on minimal design and a distraction free writing environment. Makes a folder full of dated text files that are easy to access even without the journal program.