Penzu
Today we are talking about Penzu. Penzu is a online journal or diary where you can write anything and everything. It is completely private, only for you to see, you can even put specific locks on your journals. It is completely free, but there are some upgrade options. None of them effect your writing ability at all though, they are more a cosmetic design.
Everyday Penzu will send you an email (if you wish, you can always tell it not to), and it will remind you to write a journal entry. It will ask you about your day, and if you are too busy to go directly to their website, you can simply reply to their email and they will add the entry for you!