Grammarly's own plans page draws the free-to-Pro line

The writer's problem

A writer or editor choosing a grammar and style checker for a manuscript has to decide between a free tool and a paid one, and the difference is not obvious from a homepage banner alone. Grammarly publishes its own plans page listing what each tier includes, and a separate support article that breaks down exactly what a Pro subscription costs and how it bills. Reading both together, rather than either alone, is what actually answers the question a working writer asks: what do I get, and what does it cost per month if I commit for a year.

What the documents show

As retrieved on 16 September 2026, Grammarly's plans page states the free tier includes spelling and grammar checks, tone detection, and 100 AI prompts a month at no cost. The Pro tier adds full-sentence rewrites, tone adjustment, plagiarism detection, an AI-generated-text identification feature, and 2,000 monthly AI prompts per member. Grammarly's support article on Pro pricing lists three billing options: 30 US dollars per member monthly, 60 dollars per member per quarter, or 144 dollars per member annually, about 12 dollars a month. The article also states plans allow up to 149 seats and rules out gift, lifetime or one-time plans. These are Grammarly's own claims, current only as of the retrieval date, not independently audited figures.

The editorial choice

For a working writer, the more useful distinction is not the headline price but the monthly AI-prompt ceiling and which correction types sit behind the paywall. A hundred prompts a month on the free tier can be exhausted quickly during a heavy revision pass, while full-sentence rewrites and the plagiarism and AI-text checks are Pro-only. An author revising a full manuscript should weigh the monthly prompt cap and seat count against the per-member price, rather than treating the lowest advertised number as the real cost across a whole project.

What stays with the author

Neither document addresses what happens to a manuscript's text after it passes through the checker, so that question is outside what these two sources resolve here. What both pages agree on is that Grammarly frames itself as a checking and suggestion layer, not an editor: it flags and proposes, and the writer decides what to accept. Whatever tier is purchased, the responsibility for the final sentence, and for verifying that a suggested rewrite has not changed the meaning, stays with the person who wrote it.

• Does the free tier's monthly prompt limit cover a full revision pass, or only light copyediting?
• Which corrections are genuinely tier-gated, and which are cosmetic differences in presentation?
• What does the seat and billing structure cost across a full manuscript's editing timeline, not just per month?

Grammarly's own pages answer the pricing question precisely and the data-handling question not at all here; a writer comparing checkers should treat the first as settled and the second as still open.