Grammarly

Grammarly Inc / Grammar and Writing Assistant

AI writing assistant that checks grammar, style, tone, and clarity across browsers, desktop apps, and mobile devices.

Wordtune

AI21 Labs / AI Writing Enhancement

AI writing tool from AI21 Labs that rewrites, shortens, and expands sentences with multiple tone and style options directly in the browser.

Writer

Writer / Enterprise AI Platform

Enterprise AI writing platform with company-specific AI training, brand voice consistency, and security features for professional content teams.

QuillBot

QuillBot Inc (Course Hero) / AI Paraphrasing Tool

AI paraphrasing and writing enhancement tool with seven writing modes, grammar checking, plagiarism detection, and summarisation capabilities.

TextCortex AI

TextCortex AI / AI Writing Assistant

AI writing assistant available as browser extension, web app, and desktop app with customisable AI personas, 25+ writing tools, and over 25 language support.