Nitin Khanna has been enjoying Journalong:

So you like to note down your thoughts but don't want the complexity of a proper journaling software like Day One? Journalong is now free, so just hook it up to your Dropbox and start using it to write down your thoughts in txt or markdown, maybe even several times a day.

— Journalong: Easy Peasy Dropbox journalling by Nitin Khanna