Draft
Used by 4 peopledraftin.com ↗

“When I'm working with others, I'm a big fan of Draft for the editing experience that includes versioned diffs.”
André Arko Interview, Web developer · via Uses This 
“(I hope Draft or others might one day unify this workflow.)”
Adam Wiggins Interview, Hacker, entrepreneur (Heroku) · via Uses This 
“I love Draft for writing, but I've found that not all of the editors I write for are as enthusiastic about the platform as I am.”
Lux Alptraum Interview, Writer, sex educator · via Uses This