By ProWritingAidLondon, United Kingdom1 product across 1 category
Built for this. Built for manuscripts rather than emails: pacing, repetition, dialogue tags and the reports a novelist actually wants. Sells a lifetime licence.
Free plan
Yes
Free tier with a word limit, plus Story Canvas and 2 runs of the line editing report a day
Month to month
$30/mo
Premium
Billed yearly
$10/mo
$120 a year, Premium plan −67%
Watch out: The volume of suggestions is overwhelming until you turn most of them off. There are three ways to pay — monthly, yearly, or a one-off lifetime licence — and the yearly rates the page shows are sale prices rather than the standing ones.
All plans (3)
Plan
Price
What you get
Free
$0
Free tier with a word limit, plus Story Canvas and 2 runs of the line editing report a day
Premium
$30/mo · $10/mo yearly
everything in the free tier plus unlimited runs of the line editing report. A Storyteller Sale running as this was checked cut the yearly rate 25 per cent to $7.50 a month, or $90 for the year
Premium Pro
$36/mo · $12/mo yearly
everything in Premium plus 30 chapter critiques a day. The same sale cut its yearly rate to $9 a month, or $108 for the year. Yearly and lifetime both carry a 3-day money-back guarantee, and the sale applies to yearly plans only
By LexSyracuse, United States1 product across 1 category
Built for this. A word processor that happens to have AI in it, so the writing surface comes first and the suggestions stay out of the way until asked.
Free plan
Yes
Free tier available
Month to month
$24.99/mo
Lex Pro
Billed yearly
$14.99/mo
$179.88 a year, Lex Pro plan −40%
Watch out: Fewer features than a dedicated editing tool, by choice. There is one paid tier, and the $30 of AI credits it includes each month is worth more than the subscription at either billing term, so what you are buying is model access more than software.
All plans (2)
Plan
Price
What you get
Free
$0
Free tier available
Lex Pro
$24.99/mo · $14.99/mo yearly
premium AI models including GPT-5 and Claude 4.1 Opus, $30 of AI credits included every month, much higher usage limits, priority support, early access to new features and a money-back guarantee. The annual plan opens on a trial where the monthly one subscribes straight away
By NotionSan Francisco, United States2 products across 2 categories
Strong fit. Writes and summarises inside the workspace where your notes already live, so it has the surrounding context.
Free plan
Yes
Trial of Notion AI on the free and Plus plans
Month to month
$24/mo
Notion Business, sold to teams rather than to one person
Billed yearly
$20/mo
Notion Business plan −17%
Watch out: Only as good as how organised your Notion already is. Beyond the trial it is not sold on its own: the full AI features arrive with the Business plan.
All plans (3)
Plan
Price
What you get
Free
$0
Trial of Notion AI on the free and Plus plans
Notion Business
$24/mo · $20/mo yearly
the first plan with Notion AI in full, including Notion Agent, AI meeting notes and enterprise search
Notion Enterprise
Custom
adds zero data retention with LLM providers and admin controls over AI. Notion AI is part of these plans rather than sold separately
By SudowriteSan Francisco, United States1 product across 1 category
Strong fit. Built for long fiction: it holds a story bible, keeps characters consistent across chapters, and suggests rather than replaces.
Free plan
No
Paid from the start
Month to month
$19/mo
Hobby & Student
Billed yearly
$10/mo
Hobby & Student plan −47%
Watch out: Paid from the start, though the trial takes no card. The tiers differ mainly by monthly credits — 225,000, one million and two million — rather than by features, so the question is how much you write.
All plans (3)
Plan
Price
What you get
Hobby & Student
$19/mo · $10/mo yearly
225,000 credits a month, for people writing for fun or for school
Professional
$29/mo · $22/mo yearly
1,000,000 credits a month, raised from 450,000 as this was checked, and pitched at a novel or a screenplay
Max
$59/mo · $44/mo yearly
2,000,000 credits a month, for authors publishing several times a year. Every tier carries the same story intelligence, style matching and continuity across a series, and all three open on a free trial that asks for no card
Two things separate these and both are on every card.
Fit
Whether a tool is built for this job, a strong fit for it, or
able to do it without that being its focus.
Free plan
Whether there is a tier you can keep using rather than a
trial that expires.
The order
Fit first, then a free plan, then alphabetical. There is
no score, no weighting we decline to publish, and nothing on this site a company can buy.
Questions
What is the best ai for book writing?
There is no single answer, which is why this page lists 6 rather than one: Sudowrite, ProWritingAid, Lex, Claude, ChatGPT, Notion AI. 4 of them are built for this kind of work rather than able to do it. Start with a free one.
Which of these have a free plan?
5 of the 6: ProWritingAid, Lex, Claude, ChatGPT, Notion AI. Free means a real free tier you can keep using, not a trial that expires.
How was this list chosen?
By hand, from the 750 products this site tracks, and it is checked against the catalogue on every build — a product renamed or removed breaks the build rather than quietly disappearing from here. Nothing on this site can be paid for: no listing, no position, no wording.
