iA Writer has been my text editor of choice for a while. It's available for macOS, iOS, and Android, and I use it on a daily basis on my laptop, and at times on iPad and iPhone. It is an extremely simple yet functional text editor which will let you focus on your writing.
The missing piece of iA Writer has always been a Windows version, and this is the goal of their recent Kickstarter campaign, where you can now help fund the development of a native Windows version.
For seven years now, iA Writer has been used and loved by professional writers on Mac, iOS, and Android. iA Writer runs on Windows 7, 8 and 10. It comes with a custom installer. Everything is designed to make you focus on the text. —iA Inc.