The best alternatives to ZenPen are Paperr, Fiddle.md, and prosepen. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of ZenPen?
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Paperr is an online web editor which has a bunch of exciting features including autosave in browser, inbuilt wiki search, tooltip styling capabilities, direct mail, pdf download, track of no. of words, paras and chars, and much more.
Prosepen is an all in one site for creative writers and readers. It featues a beautiful text editor and several social media features. Grow your writing and grow your following.