MailDiary is described as 'The simple diary for your memories. We regularly ask you via e-mail about your new experiences. Simply respond by e-mail and fill your diary' and is a Journaling app. There are more than 25 alternatives to MailDiary, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Android Tablet apps. The best MailDiary alternative is Day One, which is free. Other great sites and apps similar to MailDiary are Memorize, Penzu, Daylio and Stoic..