There sure are a lot of these now. There's Koi Writer [1], Dark Copy [2], Light Write [3], Quabel [4], Wabisabi [5], Write.app [6], Pen.io [7], (I like this one), Draft [8], and probably more.

[1] http://www.koi-writer.com/editor/ [2] http://darkcopy.com/ [3] http://gun.io/w/yyhegyfn6 [4] https://quabel.com/ [5] http://www.wabisabi.cc/ [6] https://writeapp.me/ [7] http://pen.io/ [8] https://draftin.com/

Then there's also native apps as well. For Mac, there's Focus Writer [1], OmmWriter [2], iaWriter [3], Writeroom [4], ByWord [5], Clean Writer [6], Writer [7], GrandView [8], and Texts [9] (I like this one)

[1] http://gottcode.org/focuswriter/ [2] http://www.ommwriter.com/ [3] http://www.iawriter.com/mac/ [4] http://www.hogbaysoftware.com/products/writeroom [5] http://bywordapp.com/ [6] https://itunes.apple.com/us/app/clean-writer-pro/id478363291... [7] https://itunes.apple.com/us/app/writer/id405680527?mt=12 [8] https://itunes.apple.com/us/app/grandview/id432436025?mt=12 [9] http://texts.io

So I guess, whenever one creates a new distraction free writer/reader, I need to know: why should I use this* app?* Your app looks pretty clean and pretty nice, but what makes it better? I don't mean this comment to put your app down as it looks pretty appealing, but I think the key first step when joining such a saturated market is to differentiate yourself.