Best Writing Assistant AI tools
AI writing assistants that rewrite, correct and draft as you write, from everyday grammar and tone helpers to novel and screenplay editors with story bibles. The 11 highest-ranked of the 11 apps tagged Writing Assistant in the Onei AI catalogue.
Everything tagged Writing Assistant: apps, skills and MCP servers
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An AI word processor for novelists and screenwriters: draft and chat in one editor, store characters and settings, apply custom style rules, and export.
Also: Creative Writing
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AI writing app for novelists that drafts, rewrites and expands fiction in your style from a Story Bible, using its own Muse model.
Also: Creative Writing
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Rytr is a low-cost AI writing assistant with 40+ use-case templates, custom tones of voice, plagiarism checks and a Chrome extension.
Also: Browser Extension, Writing
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DeepL
DeepL's AI writing assistant that corrects and rephrases text in the same language, with selectable styles and tones.
Also: Browser Extension, Proofreading
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AI21 Labs
AI21 Labs' writing assistant that rewrites sentences in context, checks grammar and spelling, and summarises articles and videos, in the browser and on iPhone.
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AI writing assistant that checks grammar, tone and clarity as you type in browsers, desktop apps and on mobile, with one-click rewrites and AI drafting.
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Online manuscript editor for fiction and nonfiction authors: self-editing reports benchmarked against published books, plus automated AI alpha and beta readers.
Also: Creative Writing, Proofreading
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Cloud writing app for novelists and screenwriters with plotting boards, story elements and optional AI for outlines, rewrites, analysis and covers.
Also: Creative Writing
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Rephrase AI LLC
AI rephraser that rewrites sentences, paragraphs and emails with tone, complexity, brevity and creativity controls while keeping your meaning intact.
Also: Paraphrasing
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AI book and screenplay writer that turns an idea into a full chaptered draft, then revises it with you in an editor with agentic chat.
Also: Creative Writing, Writing
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Novel-writing platform with a Codex story bible, planning views and bring-your-own-key AI for drafting, chat and review.
Also: Creative Writing, Writing
How this list is ranked
Ranked by editorial weight (0–100), plus 5 points per bookmark up to 10, plus or minus up to 20 for the average review rating; ties go to featured apps, then the most recently updated. Discontinued apps are never ranked.