Made by the Feldar team. Feldar is our app, so it is our first pick here. Everything we say about other apps comes from their own pages, and we link to them.
The best AI writing assistant depends on what you write. For fiction and books, our pick is Feldar, which we make: it knows your whole project and every suggestion waits for your yes. For clear, correct writing everywhere you type, Grammarly. For deep style reports on a manuscript, ProWritingAid.
By the Feldar team · 8 assistants compared · prices checked 8 November 2026
The 8 best AI writing assistants, by what each does best
"AI writing assistant" covers tools that fix your sentences, tools that rewrite them and tools that write for you. The order is our preference for people who write long things of their own, such as books, and our own app is first.
01FeldarWriting fiction and books, with AI you approve OursFree, then $20/mo
02GrammarlyClear, correct writing everywhere you typeFree, Pro $12/mo
03ProWritingAidStyle reports and critiques for long manuscriptsFree, paid plans
05ClaudeDrafting and feedback in conversationFree, Pro $20/mo
06ChatGPTEveryday writing, brainstorming and researchFree, Go $8/mo
07QuillBotParaphrasing and rewordingFree, paid plan
08WordtuneRewriting a sentence until it sounds rightFree, from $4.89/mo
Four kinds of AI writing assistant
Pick the kind first, then the tool. Most disappointment comes from using a tool built for one job to do another.
Correctors
Fix grammar, spelling, clarity and tone in what you already wrote. Grammarly and ProWritingAid. Best for emails, essays and final passes on a manuscript.
Rewriters
Offer other ways to say a sentence or paragraph. QuillBot and Wordtune. Good for stuck sentences; risky for voice if you accept too many.
General assistants
Write, explain, summarize and brainstorm on request. Claude and ChatGPT. Powerful, but they sit outside your document and do not know your project unless you paste it in.
Fiction tools
Built around stories: scenes, characters, chapters and continuity. Feldar and Sudowrite. Best when the writing is long, creative and yours.
Side by side
Assistant
Kind
Free plan
Paid from
Works inside
Feldar Ours
Fiction tool
500 credits, no card
$20/mo
Its own editor (web, Mac)
Grammarly
Corrector
Grammar, spelling, tone, 100 AI prompts
$12/mo (Pro)
Browser, desktop, mobile, docs
ProWritingAid
Corrector
Reports on 500 words, twice a day per report
€10/mo billed yearly (shown in euros)
Web editor, browser and app integrations
Sudowrite
Fiction tool
Free trial
$10/mo billed yearly
Its own editor, iOS, Android
Claude
General assistant
Yes, with limits
$20/mo (Pro)
Chat on web, desktop, mobile
ChatGPT
General assistant
Yes, with limits
$8/mo (Go)
Chat on web, desktop, mobile
QuillBot
Rewriter
Paraphrase up to 125 words, 2 modes
€8.33/mo billed yearly (shown in euros)
Web, browser extensions, apps
Wordtune
Rewriter
10 rewrites a day
$4.89/mo billed yearly
Web, browser extension
Prices from each tool's official pricing page, checked 8 November 2026. ProWritingAid and QuillBot showed us euro prices; prices vary by country.
The AI writing assistants, one by one
01Feldar Ours
Best for writing fiction and books, with AI you approve
Feldar is a writing app for novelists, and its AI is built to assist rather than take over. Continue from here writes at your cursor in blue and waits for Accept, Revise or Dismiss. Select a passage and choose Polish, Deepen or Enhance (tighten, clarify, add interiority, raise tension and more), or type an instruction like "slow this down", and the rewrite arrives in a card with every change marked. Checks run editorial passes for grammar, clarity, word choice, dialogue and point of view, and Lens gives reader reactions from personas such as a Critic, an Editor and a Reader.
Because it is a full writing app, the assistant knows your project: chapters are planned as scenes, characters and places live on a Canvas, and a 600-word sample of your prose lets Feldar write in your voice.
Deepen Description in Feldar. The added words are in blue, and your original stays until you press Apply.
Good
AI that never overwrites you. Knows your whole project. Six models: GPT-6 Astra, Sol and Luna, and Claude Opus 5.5, Sonnet 5.5 and Haiku 5.5. A private Writing record of what you typed versus what came from Feldar. Feldar does not train AI models on your writing.
Watch out
Built for fiction, not emails or essays. Works in its own editor, not in other apps. No offline mode or phone app. English only.
Price
Starter free with 500 credits, no card. Core $20 a month, Pro $40, Ultra $200.
Best for clear, correct writing everywhere you type
Grammarly checks grammar, spelling and tone in your browser, desktop apps, phone keyboard and documents. The free plan fixes mistakes and shows your tone; Pro rewrites full sentences, adjusts tone and adds plagiarism and AI text detection.
Good
Works almost everywhere you write. A useful free plan. Strong for emails, essays and work writing.
Watch out
Built for clarity, which can flatten a fiction writer's style if you accept every suggestion. The free plan includes only 100 AI prompts.
Best for style reports and critiques for long manuscripts
ProWritingAid goes deeper than a grammar checker: 25 and more reports on readability, overused words, sentence variety and sensory detail, plus chapter critiques, plot and character analysis, and a Story Canvas for testing an idea before you write.
Good
Detailed reports built for fiction. Chapter critiques on paid plans. A lifetime option. Works in its web editor and integrates with other apps.
Watch out
The free plan is tight: each report runs twice a day on 500 words. Whole-manuscript analysis uses Story Credits, bought separately.
Price
Free. On the European page we saw: Premium €10 a month billed yearly (€120) or €30 monthly; Premium Pro €12 a month billed yearly; lifetime from €399. Prices vary by country.
Sudowrite is made for fiction, with Write, Rewrite, Describe, Expand and Brainstorm tools that work on your draft, a Story Bible that acts as the AI's memory, and drafting from an outline. It offers many models, including its own fiction models, Muse and Ballad.
Good
Fiction-tuned models. Strong drafting and expansion. Series support. iOS and Android apps. It says it does not train on your writing.
Watch out
Heavy drafting uses credits quickly. The pricing page defaults to yearly billing.
Price
Hobby and Student $10 a month billed yearly, or $19 monthly. Professional $22 and Max $44 a month billed yearly.
Anthropic's Claude is a general assistant that is especially good at long, careful writing and at explaining what is wrong with a draft. You work in a chat: paste text in, ask for edits or feedback, and copy results out.
Good
Thoughtful feedback and strong long-form writing. A free plan. Apps on web, desktop and mobile.
Watch out
Lives outside your document. Consumer chats can be used for training if you allow it in settings.
Price
Free. Pro $20 a month, or $17 a month billed yearly. Max from $100 a month.
Best for everyday writing, brainstorming and research
OpenAI's ChatGPT drafts emails, outlines, summaries and ideas on request, and answers research questions quickly. Like Claude, it works in a chat rather than inside your document.
Good
Fast and versatile. A free plan and a low cost Go plan. Apps everywhere.
Watch out
Generic voice unless you guide it. On individual plans, conversations may be used for training unless you turn that off.
QuillBot is best known for its paraphraser, which rewrites a passage in different modes, alongside a grammar checker, summarizer, citation generator and translator, in the browser and as extensions and apps.
Good
A quick way to see a sentence said another way. Many small tools in one place.
Watch out
The free paraphraser stops at 125 words and 2 modes. Paraphrased text can lose your voice.
Price
Free. Premium €8.33 a month billed yearly on the European page we saw; prices vary by country.
Best for rewriting a sentence until it sounds right
Wordtune suggests rewrites of a sentence or paragraph so you can pick the version that sounds right, and it also summarizes text and checks spelling and grammar.
Good
Quick alternatives for a stuck sentence. Unlimited spelling and grammar checks on the free plan.
Watch out
The free plan allows 10 rewrites and AI suggestions a day, and 3 summaries a month.
Price
Free. Advanced $4.89 a month and Unlimited $6.99 a month, billed yearly, with a 3-day free trial.
For fiction and books, our pick is Feldar, which we make: it knows your project and every suggestion waits for your approval. For everyday writing everywhere you type, Grammarly. For deep style reports on a manuscript, ProWritingAid.
What is the best free AI writing assistant?
Grammarly's free plan for corrections, Claude or ChatGPT's free plans for drafting and feedback, and Feldar's free plan (500 credits) for fiction. Wordtune and QuillBot have limited free rewriting.
Will an AI writing assistant change my voice?
It can, if you accept every suggestion. Correctors push toward plain, clear prose, and rewriters toward average phrasing. Treat suggestions as options, and use a tool that shows every change before it lands.
Do AI writing assistants train on my writing?
Policies differ. Feldar says it does not use your writing to train AI models, and Sudowrite says the same. Claude and ChatGPT consumer plans can use chats for training depending on your settings. Check each tool's privacy page.
Sources
Feldar
feldar.com/pricing and Feldar's changelog, 8 November 2026.
Grammarly
grammarly.com/plans, 8 November 2026.
ProWritingAid
prowritingaid.com/pricing, 8 November 2026 (euro prices shown to us).
Sudowrite
sudowrite.com pricing, checked 5 to 8 November 2026.
Claude
claude.com/pricing, 8 November 2026.
ChatGPT
chatgpt.com/pricing and OpenAI help center, November 2026.
QuillBot
quillbot.com/premium, 8 November 2026 (euro prices shown to us).
