By Google DeepMindLondon, United Kingdom6 products across 6 categories
Strong fit. Drafts directly in Gmail and Docs with your existing files as context. No copy-pasting between tools.
Free plan
Yes
Gemini is available in the free consumer tier, but not inside Gmail and Docs on a personal
Month to month
$19.99/mo
Google AI Pro
Billed yearly
$16.67/mo
$199.99 a year, Google AI Pro plan −17%
Watch out: Best features are tied to a paid Workspace plan rather than the free consumer tier. There is no separate price: it comes with a Workspace subscription.
All plans (4)
Plan
Price
What you get
Free
$0
Gemini is available in the free consumer tier, but not inside Gmail and Docs on a personal account
Workspace with Gemini
$14/mo
Gemini in Gmail, Docs and the rest of Workspace with your files as context. Gemini in Workspace comes with a Workspace subscription, not as a separate purchase
Google AI Pro
$19.99/mo
the consumer plan that raises Gemini limits outside Workspace
By GrammarlySan Francisco, United States1 product across 1 category
Built for this. Works inside the apps you already write in rather than a separate window, which is why it actually gets used. Grammar, tone and clarity in place.
Free plan
Yes
Writing without spelling and grammar mistakes, tone detection, and 100 AI prompts for
Month to month
$30/mo
Pro
Billed yearly
$12/mo
$144 a year, Pro plan −60%
Watch out: Better at fixing than composing. It smooths writing toward a neutral register, which is not always what you want.
All plans (3)
Plan
Price
What you get
Free
$0
Free tier: writing without spelling and grammar mistakes, tone detection, and 100 AI prompts for generating text
Pro
$30/mo · $12/mo yearly
rewriting whole sentences in a click, tone adjustment, unlimited personalised suggestions, and plagiarism and AI-text detection. It opens on a 7-day free trial with nothing to pay on the day and a reminder two days before it ends
Enterprise
Custom
adds proactive AI across the apps you work in, dedicated support, bring-your-own-key encryption, custom roles and permissions, and data loss prevention
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 LearneoRedwood City, United States2 products across 1 category
Built for this. Strong across more than 30 languages rather than English alone, and it can be self-hosted, which almost nothing else in this category offers.
Free plan
Yes
Free tier covering basic grammar and spelling
Month to month
$24.90/mo
Premium
Billed yearly
$5.83/mo
$69.90 a year, Premium plan −77%
Watch out: Owned by the same company as QuillBot since 2023. Month to month costs more than four times the annual rate, and there are four payment intervals to pick between, so the interval matters more than the tier.
All plans (3)
Plan
Price
What you get
Free
$0
Free tier covering basic grammar and spelling
Premium
$24.90/mo · $16.63/mo quarterly · $5.83/mo yearly
enhanced grammar, punctuation and style checking, up to 150,000 characters a text field, unlimited AI sentence paraphrasing, a style guide and the browser add-on
Teams
$11.07/mo
everything in Premium plus user management, a team style guide and a team dictionary. Every price on the page includes VAT
By AI21 LabsTel Aviv, Israel1 product across 1 category
Built for this. Offers several rewrites of a sentence at once and lets you pick, which is a better fit for how editing actually works than a single suggestion.
Free plan
Yes
Free Basic plan: 10 rewrites and AI suggestions a day plus AI generations, 3 AI summarisations
Month to month
$13.99/mo
Advanced
Billed yearly
$6.99/mo
Advanced plan −50%
Watch out: Sentence-level by design, so it will not fix a paragraph that is structured wrong. The free tier runs to 10 rewrites a day and 3 AI summaries a month, and even the middle plan is capped at 30 rewrites a day — only the top plan is actually unlimited, which is what its name is doing.
All plans (3)
Plan
Price
What you get
Free
$0
Free Basic plan: 10 rewrites and AI suggestions a day plus AI generations, 3 AI summarisations a month, and unlimited spelling corrections and grammar checks
Advanced
$13.99/mo · $6.99/mo yearly
30 rewrites and AI suggestions a day, 15 AI summarisations a month, and unlimited AI recommendations, spelling corrections and grammar checks
Unlimited
$19.99/mo · $9.99/mo yearly
unlimited rewrites, AI suggestions and summarisations, with vocabulary enhancements, clarity improvements, fluency increases and premium support. Both paid plans open on a 3-day free trial, and annual billing is exactly half the monthly rate on each
By MicrosoftRedmond, United States1 product across 1 category
Built for this. Sits inside Word, Excel, Outlook and Teams, so it works on the documents and meetings a company already has. The closest thing to AI that needs no change of habit.
Free plan
No
Paid from the start
Month to month
$25.20/mo
Microsoft 365 Copilot Business, sold to teams rather than to one person
Billed yearly
$21/mo
Microsoft 365 Copilot Business plan −17%
Watch out: An add-on rather than a standalone purchase: the enterprise Copilot seat is $30 a user a month on top of a qualifying Microsoft 365 licence you must already hold, and Copilot Chat is only included if you already pay for an eligible subscription. Agents need an Azure subscription on top again.
All plans (5)
Plan
Price
What you get
Microsoft 365 Copilot Business
$25.20/mo · $21/mo yearly
an add-on to an existing Microsoft 365 plan rather than a subscription in its own right
Microsoft 365 Business Standard with Copilot
$28.20/mo · $23.50/mo yearly
the Microsoft 365 apps across devices with Copilot built in
Microsoft 365 Business Premium with Copilot
$38.40/mo · $32/mo yearly
the same again with the advanced security tier
Microsoft 365 Copilot, the enterprise seat
$30/mo yearly
Microsoft 365 Copilot Chat
included at no additional cost for Microsoft Entra users on an eligible Microsoft 365 subscription, though agents need an Azure subscription and Copilot Studio capacity is bought prepaid
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 business writing?
There is no single answer, which is why this page lists 9 rather than one: Claude, ChatGPT, Microsoft 365 Copilot, Gemini in Workspace, Grammarly, Gamma, ProWritingAid, LanguageTool, Wordtune. 8 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?
8 of the 9: Claude, ChatGPT, Gemini in Workspace, Grammarly, Gamma, ProWritingAid, LanguageTool, Wordtune. 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.
