Grammarly - Clear, effective, mistake-free writing everywhere you type.
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Cognifyd - The smart editor that helps you write business content
Gramara - AI grammar correction with transformers
Kibin - Professional Proofreading as a Service
Grammar Snob - Markup your friends' iMessages like an English teacher 😁