Grammarly pricing has three tiers as of September 2026: Free at $0, Pro at $12 per member per month billed annually (that is $144 up front) or $30 per month if you pay month to month, and Enterprise by custom quote. Those numbers come from Grammarly’s own plans page and its Pro page, checked September 2026.
In this breakdown, you will learn:
- What each tier costs and what the annual commitment really buys
- Which tier makes sense if you are writing a book rather than emails
- Where Grammarly genuinely beats a book-writing tool like Chapter
- What Grammarly will not do for your manuscript at any price
Here is the pricing, then the part that matters to authors.
How Much Does Grammarly Cost in 2026?
Grammarly costs $0 on the Free plan, $12 per member per month on Pro when billed annually, and $30 per member per month on Pro when billed monthly. Enterprise has no published price and requires contacting sales. Grammarly advertises savings of up to 60% for choosing annual billing.
| Tier | Price (as of Sep 2026) | Billed | AI prompts / member / month |
|---|---|---|---|
| Free | $0 | — | 100 |
| Pro | $12 / member / month | Annually ($144) | 2,000 |
| Pro | $30 / member / month | Monthly | 2,000 |
| Enterprise | Custom quote | Annual contract | Unlimited |
The gap between the two Pro options is the thing most people get wrong. Paying monthly costs $360 over a year against $144 annually — a $216 penalty for flexibility on the same product.
What You Get on the Free Plan
The Free plan covers grammar, spelling, punctuation and basic tone detection everywhere the browser extension and desktop app reach. You also get 100 AI prompts a month. No card, no seat minimum.
For a lot of authors this is genuinely enough. If your manuscript lives in Google Docs or Word and you want a second pair of eyes on typos, Free does that job.
Where it stops: no full-sentence rewrites, no tone adjustment, no plagiarism or AI-text detection, and suggestions are capped rather than unlimited.
What Grammarly Pro Adds
Grammarly Pro adds full-sentence rewrites, tone adjustment, unlimited personalised suggestions, plagiarism detection, AI-text detection, and 2,000 AI prompts a member each month. It also bundles light team features — snippets, one style guide, one brand tone, up to two user groups, and a team analytics dashboard.
The style guide is the feature authors underrate. If you have decided on serial commas, on spelling “grey” rather than “gray”, on how your invented place names are capitalised, a style guide enforces it across 90,000 words without you remembering.
Plagiarism and AI-detection matter if you are publishing under a name you intend to keep. Amazon KDP requires you to disclose AI-generated content at upload, and knowing what a detector says about your own prose before a retailer runs one is worth something.
Pro supports up to 149 members. Past that you are quoted as Enterprise.
What Enterprise Costs and Who It Is For
Grammarly Enterprise has no public price — it is a custom quote, positioned for organisations of roughly 150 seats and up. It adds SAML single sign-on, SCIM provisioning, BYOK encryption, data loss prevention, audit logs, custom roles, and unlimited AI prompts.
None of that is author-facing. If you are a solo author, or two co-writers, Enterprise is not a tier you should ever be quoted on. It exists for legal, compliance and procurement teams.
One 2026 wrinkle worth knowing: the parent company renamed itself Superhuman in October 2025 after acquiring the email client of that name, as the company confirmed on its own blog. The writing product is still called Grammarly. Enterprise is now sold partly through that broader suite, which is why quotes vary.
Is Grammarly Pro Worth It for a Book Author?
Grammarly Pro is worth it for a book author if you already have a finished draft and a real editing pass ahead of you. At $144 for the year it is a fraction of a professional copy editor, whose rates the Editorial Freelancers Association puts in the range of $46 to $50 an hour for copyediting, and it will catch thousands of mechanical errors before that editor sees the file.
It is not worth it if you are still staring at chapter one. Paying $144 a year for a tool that corrects sentences you have not written yet is the most common way authors waste money on writing software.
A practical sequence: draft first, then buy one year of Pro for the editing months, then decide whether to renew. Grammarly does not get cheaper by holding a subscription across the drafting year.
Where Grammarly Beats Chapter
This is an honest section, because pretending otherwise would be useless to you. Grammarly and Chapter are not the same category, and in Grammarly’s category Chapter loses outright.
Grammarly is a better editor. Chapter is not an editor at all. Chapter generates a structured manuscript. It does not sit inside Gmail catching a comma splice in a query letter to an agent, and it does not run a line-level grammar engine across text you wrote elsewhere.
Specifically, Grammarly wins on:
- Ubiquity. It works in your browser, email client, Word, Docs, Slack and Scrivener. Chapter works in Chapter. If you want one correctness layer across everything you type, Grammarly is the only one of the two that does it.
- Mechanical accuracy at the sentence level. Grammarly’s grammar and punctuation engine has had well over a decade of tuning on a colossal corpus. No book-generation tool matches it on comma placement, subject-verb agreement or misused homophones.
- Plagiarism and AI-text detection. Chapter has no equivalent. If you need to check a manuscript against published sources — essential for nonfiction with heavy research — Grammarly Pro does it and Chapter does not.
- Tone rewriting on existing prose. Feed Grammarly a stiff paragraph and it will loosen it. Chapter writes new prose; it is not a rewriting layer over yours.
- A free tier that is genuinely useful. Chapter has no free tier. Grammarly’s $0 plan will serve a broke author better than nothing at all.
- Team and style-guide enforcement. If you run a ghostwriting operation or a small press, Grammarly’s style guide and analytics have no Chapter counterpart.
If your problem is “my sentences are messy,” buy Grammarly and stop reading here. That is the honest answer.
Our Product — Chapter
Chapter exists for the other problem: you do not have a manuscript yet. It takes your idea, builds the structure, and produces a complete, coherent draft you can then edit — including with Grammarly.
Best for: authors who need a finished draft to exist before any editing tool is relevant Pricing: $97 one-time, nonfiction or fiction — no renewal Why we built it: because a grammar checker on a blank page corrects nothing
The recommendation is Chapter first, then Grammarly, in that order — but only because most people who search for editing software are actually stuck on the draft, not the commas. Over 2,147 authors and 5,000+ books have gone through Chapter, and the pattern is consistent: the draft is the bottleneck. See the full Chapter pricing breakdown or the head-to-head in Chapter vs Grammarly.
Grammarly Pricing vs Other Editing Tools
| Tool | Price | Model |
|---|---|---|
| Chapter | $97 | One-time, lifetime |
| Grammarly Free | $0 | Free forever |
| Grammarly Pro | $144 / year | Annual subscription |
| Grammarly Pro (monthly) | $360 / year | Monthly subscription |
| Grammarly Enterprise | Quote | Annual contract |
Over three years, Grammarly Pro on annual billing costs $432. Chapter costs $97 once. They are not substitutes, but that is the shape of the spend, and it is worth seeing before you commit.
For manuscript-length work specifically, compare against ProWritingAid, which prices a lifetime option and reports more structural fiction metrics, and read our take on the best AI book editor options overall.
How to Avoid Overpaying
Three cost traps, in order of how much they cost you:
- Monthly billing. $216 a year more than annual for identical features. Only choose it if you genuinely need two or three months and then out.
- Subscribing before you draft. Pay for editing tools during the editing months, not the drafting ones.
- Paying for seats you do not use. Pro is priced per member. A two-person team on one shared account is against the terms; a two-person team on two seats is $288 a year.
Grammarly runs a 7-day free trial on Pro with no payment taken on day one. Run your worst chapter through it before you decide.
FAQ
How much is Grammarly per month?
Grammarly costs $12 per member per month on Pro if you pay for a year up front, or $30 per member per month if you pay month to month, as of September 2026. The Free plan is $0. Enterprise is quoted individually.
Is there a Grammarly free version?
Yes. Grammarly’s Free plan costs $0 with no card required, and covers grammar, spelling, punctuation, basic tone detection and 100 AI prompts a month. It excludes full-sentence rewrites, plagiarism detection and unlimited suggestions.
Does Grammarly offer a lifetime deal?
No. Grammarly has no lifetime or one-time purchase option — every paid tier is a recurring subscription, monthly or annual. If a one-time price matters to you, ProWritingAid sells a lifetime licence and Chapter is a one-time $97.
Can Grammarly edit a whole book?
Grammarly can check a whole book, but in pieces. It is a sentence-level and paragraph-level tool with no chapter or structural awareness, so it will not flag a sagging act two or a plot hole. For that you need developmental editing, which is a different job entirely.
Is Grammarly Pro worth it for authors?
Grammarly Pro is worth it for authors during the editing phase of a finished draft, where $144 a year buys unlimited suggestions, rewrites and plagiarism checking. It is poor value during drafting, because a grammar checker cannot correct pages you have not written.
Pricing verified against grammarly.com/plans and grammarly.com/pro in September 2026. Subscription prices change — check the source before you buy.
