My Wonderful Days. I’ve been using this journaling app on iOS since 2011. On OS X almost as long. I don’t use it regularly. Sometimes months go by between uses. But it is there when my hand written journal isn’t at hand, and for that I am very grateful. It syncs between devices, creates a PDF of entries and continues to be updated, including using Markdown now. The apps have served me well, and continue to do so.