Grammarly - Clear, effective, mistake-free writing everywhere you type.

Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.

Grammar Snob - Markup your friends' iMessages like an English teacher 😁

Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.

Deep Grammar - Grammar checker based on deep learning

Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA