If you're looking for a diary that can help you keep track of your thoughts and moments, then you should check out Day One. It's a diary that will help you preserve every moment of your life and even helps you be grateful. You can also set it to a password so that no one else can access it except you.

You can also sync it up to Google Drive or Dropbox, so you can access it from different devices. And, if you want to export it to txt, pdf, or print it, you can do that as well. You can also track your mood with the emotion tracker.