What are some alternatives?
When comparing Typewriter and Grammarly, you can also consider the following products
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Word Geeks - A curated marketplace of on-demand writers
Ginger - Powerful and effortless desktop & mobile solutions for improving your writing and productivity. Ginger Software is your personalized editor - everywhere you go.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.