Grammarly Free vs Pro: Where the AI Prompts Run Out

Grammarly does not sell AI by the word, the token or the credit. It sells prompts, and the difference matters because one prompt can rewrite a sentence or draft an email for the same cost. The published allowances are 100 a month on Free, 2,000 per member a month on Pro and unlimited on Enterprise. This article reads Grammarly's plans page and its support documentation as checked on October 11, 2026, defines what counts as a prompt, and lists what the price card does not say.

One prompt is one request, including a suggested rewrite

Grammarly's support documentation is specific about the unit. It states: "Each time you enter something in the prompt field or use a provided suggestion like 'Improve it,' you use one of your allocated generative AI prompts."

Two consequences follow. A one-word instruction costs the same as a detailed brief. And clicking a shortcut Grammarly itself offers also draws down the balance, so the meter runs during ordinary editing, not only during deliberate drafting.

The documentation also sets the refill rule: the number of available prompts "will be automatically refilled on a monthly basis, determined by the day generative AI assistance first became available within your account."

That anniversary date is not the calendar month and not necessarily the billing date. Nothing in the article we read addresses whether unused prompts carry forward, so treat the allowance as use-it-or-lose-it until Grammarly says otherwise.

The published allowances: 100, 2,000 and unlimited

Grammarly's plans page lists three consumer and business tiers. The generative AI row in its comparison table reads 100 prompts per month on Free, 2,000 prompts per member per month on Pro and unlimited prompts per member per month on Enterprise.

On the plan cards the same limits appear as feature lines: "Generate text with 100 AI prompts" on Free and "Generate text with 2,000 AI prompts" on Pro, read October 11, 2026.

One inconsistency is worth flagging. Grammarly's support article on prompt counts still describes a Premium tier with "access to 1000 generative AI prompts per month", a name the plans page no longer shows.

We did not find a reconciliation of those two pages. Where vendor pages disagree, the plans page is the one a buyer is charged from, so Free, Pro and Enterprise are the tiers to price.

The Pro price card does not state a billing period

Grammarly shows "$0 USD / month" for Free. For Pro it shows "$12 USD" with no period printed beside it, as read on October 11, 2026, alongside a 7-day free trial and an email reminder two days before the trial ends.

That omission matters. A $12 monthly rate and a $12 annual-equivalent rate differ by whatever the monthly premium is, and the page as served to us did not resolve which one is shown.

This is a common pattern rather than a Grammarly quirk. Runway strikes through $15 to show $12 on annual billing, and Writesonic prints $79 with the words "per month, billed annually".

The method for untangling it sits in how to read an AI credit pricing page, which puts the billing-period question fourth of six, after the unit and the output conversion.

What else changes between Free and Pro

The prompt allowance is the headline, but the comparison table moves several other rows at the same boundary, per the plans page on October 11, 2026.

• Free includes writing corrections and tone detection; adjusting tone, full-sentence rewrites and fluency support are Pro.
• Plagiarism detection and AI-generated text detection are listed as unavailable on Free and available on Pro.
• Pro lists unlimited personalised suggestions, against a capped experience on Free.
• Account roles, permissions and the Feature Management Hub appear from Pro; user groups are capped at 2 on Pro and unlimited on Enterprise.
• SAML single sign-on, SCIM, managed mode, data loss prevention, audit logs API and bring-your-own-key encryption are Enterprise only.

For a solo writer, the decision is almost entirely about the prompt count and the two detectors. For a team, it is about user groups and the security rows, which sit a tier higher than most buyers expect.

Enterprise is sold through Superhuman Go

Grammarly's Enterprise card describes the tier as available through Superhuman Go, and the site navigation lists Superhuman alongside the Grammarly product pages, as read October 11, 2026.

Buyers comparing quotes should expect the Enterprise contract and the product name to differ from the consumer-facing brand. No Enterprise price is published; the card routes to a sales contact.

How 2,000 prompts compares with a credit plan

Prompts are a coarser unit than credits, which cuts both ways. A Grammarly prompt that rewrites 400 words costs the same as one that fixes a clause.

Compare that with a metered video tool. Runway charges 12 credits per second of Gen-4.5 output, so a single long clip can consume a month's allowance, as set out in Runway against HeyGen on video credits.

Compare it also with per-article metering. Writesonic publishes 15 AI articles a month on Starter and 50 on Growth. One article is a far larger unit than one prompt, and far easier to count.

The useful question is how many discrete requests a working day produces. Twenty requests a day reaches 2,000 in roughly 100 working days, which our arithmetic puts at under five months of heavy use.

A coarse unit is easier to track and harder to optimise. With credits you can choose a cheaper model; with prompts the only lever is asking fewer, longer questions, as the AI credit mechanics explainer sets out.

Who each tier fits

• Free fits proofreading with occasional generation, since 100 prompts a month is about five requests a working day.
• Pro fits daily drafting and rewriting, and is the first tier with plagiarism and AI-text detection.
• Enterprise fits organisations that need SSO, SCIM, data loss prevention or an audit trail, none of which appear below it.
• None of the tiers fits a team that wants a published annual total per seat, because the page does not print one.

What Grammarly does not publish

There is no stated rollover rule for unused prompts, no published Enterprise price, no seat minimum on Pro and no stated conversion between a prompt and an amount of output. All four would change a buying decision.

The plans page also does not say whether AI Chat, the resume builder or the other listed AI agents draw on the same prompt balance. We did not find that mapping on the pages we read.

Video vendors are further ahead here. Both sides of the Runway and HeyGen comparison publish a per-feature rate card, so a buyer can price a specific job before subscribing.

Bottom line

Grammarly's metering is simple to understand and hard to forecast: one request is one prompt, 100 a month on Free and 2,000 per member on Pro, with no published carry-over.

Before upgrading, count the requests a normal week produces rather than the words written, and settle the billing period on the Pro card with Grammarly directly.

All figures reflect Grammarly's own pages on October 11, 2026. For the wider pattern across AI tools, see how AI writing credits work and the Claude Free, Pro and Max plan ladder.

Frequently asked questions

How many AI prompts does Grammarly Free include?

The plans page lists 100 prompts per month on Free, as read October 11, 2026. That works out at about five generative requests a working day, including clicks on Grammarly's own suggested rewrites.

How many prompts does Grammarly Pro include?

Pro lists 2,000 prompts per member per month. Enterprise lists unlimited prompts per member per month and is sold through Superhuman Go, with no published price on the plans page.

What counts as one Grammarly prompt?

Per Grammarly's support documentation, each entry in the prompt field or use of a provided suggestion such as "Improve it" consumes one prompt. Length of the request does not change the cost.

Do unused Grammarly prompts roll over?

The support article we read does not say. It states only that prompts refill monthly on the anniversary of the day generative AI first became available in the account, so assume no carry-over.

Is Grammarly Pro $12 a month or $12 a year?

The plans page shows "$12 USD" for Pro with no billing period printed next to the price, as read October 11, 2026. Confirm the period at checkout before comparing it with any monthly-billed rival.