Wordtune

ProWritingAid

ProWritingAid is a writing toolkit built for authors, covering the full book-writing process from planning through editing. It includes a Story Canvas and Plot Analysis for planning, a distraction-free Write Mode with Creative Nudges for drafting, and grammar and style checking with detailed Writing Reports for line editing. Beyond grammar checking, it offers story-level critique tools such as Chapter Critique, Character Analysis, Manuscript Analysis, and a Virtual Beta Reader, plus community writing events like Novel November. It integrates with Microsoft Word, Google Docs, Scrivener, and major browsers, and is positioned around helping writers finish their work rather than writing for them.

Hemingway Editor

Hemingway Editor is a writing tool that color-codes sentences by readability, flagging overly complex or hard-to-read passages, passive voice, weakening adverbs, and better word choices as you type. The free web version works in any browser for quick edits, while the paid Editor Plus subscription adds AI-powered rewrite suggestions, grammar and plagiarism checks, and publishing to Medium or WordPress; a separate one-time Classic desktop app offers offline editing without AI features.

Grammarly

Grammarly is an AI writing assistant that checks grammar, spelling, punctuation, and style in real time across browsers, desktop apps, and mobile keyboards. It integrates directly into Gmail, Google Docs, Microsoft Word, Slack, and thousands of other websites via a browser extension. Beyond basic correctness, Grammarly analyzes tone and clarity, suggesting rewrites to make writing more concise, confident, or friendly depending on the context and audience selected by the user. GrammarlyGO adds generative AI features for drafting emails, replying to messages, and rewriting passages on demand, while Grammarly Business adds brand style guides and analytics for teams that need consistent written communication across an organization.

QuillBot

QuillBot is an AI-powered writing suite built around its paraphrasing tool, offering multiple rewriting modes alongside grammar checking, a plagiarism checker, an AI content detector, and a summarizer. The platform says it is used by more than 35 million writers across 180+ countries, including students, academics, and business professionals who need to rework and polish written text quickly. Beyond paraphrasing, QuillBot's suite has grown to include a citation generator, a translator supporting 40+ languages, PDF and document tools, and an AI image generator, with access through a web dashboard, browser extensions for Chrome, Edge, and Safari, and a Microsoft Word add-in. A free plan covers basic paraphrasing and grammar fixes, while Premium unlocks unlimited use, all nine paraphrasing modes, and full AI detection.