Diarly provides a clean interface design around a ‘page per day’ concept of journaling.
It uses iCloud for data syncing with native apps on macOS and iOS.
It has a great implementation of Markdown, even to the point where pasting over highlighted text with a link on the clipboard will create a Markdown link.
Where it falls down is in the niceties. It doesn’t tag entries with geolocation, weather, etc. in the way Day One does so well. It does, however, have a multitude of themes.
Disclosure: I was fortunate enough to be provided with coupon codes for the app by Steve Zeoli from Welcome to Sherwood.
Diarly Redux at Welcome to Sherwood.