Grammarly

Grammarly does one job that millions of people now recognize on sight: it checks writing as you type and points out grammar, spelling, punctuation, and tone issues. By our assessment, it is especially good at catching the everyday mistakes that slip past a quick read and at making suggestions without forcing a full rewrite. The limit is that it cannot truly know your intent, so its tone and clarity advice can feel blunt or off when the sentence is doing something deliberate. In practice, the tool sits in the draft stage, hovering over email, documents, and browser text boxes, which makes it feel less like a teacher and more like an ever-present editor. Compared with built-in spellcheckers, Grammarly is deeper and more opinionated; compared with a human editor, it is faster but much less subtle. The people who get the most from it are those writing a lot in English and wanting a second pass before sending. Grammarly is based in the United States, and that helps explain its strong focus on English-first writing.