Minimalistic editor, the interface without buttons and menus does not distract from the work on the text (all the space is taken up by the “blank sheet”, and the already written paragraph becomes less bright). Available for iOS, Android and Mac, in 2018 came out an application for Windows as well (money to launch it was raised on Kickstarter). It supports Markdown markup language. Provides synchronization between Mac and iOS devices, uploading documents to iCloud and Dropbox. You can export the finished document into docx, HTML, PDF, and publish it in WordPress and Medium.
The Mac app is $29.99 and the Windows app is $19.99. The Android app is free and the iOS app is $8.99. A two-week free trial is offered.