Grammarly Free 100 AI prompts: when indies should buy Pro

When indies use Grammarly on landing pages, outreach email, and help docs, Free catches basic spelling and grammar. The real walls are usually the one hundred AI prompts per month and the moment you need full-sentence rewrites, tone control, plagiarism checks, or AI-text detection. This page does not compare Grammarly with DeepL Write for overseas English. It freezes Free versus Pro (shown as $12 USD on grammarly.com/plans on 2026-10-03) and the signals that justify paying. Re-check before checkout; prices and limits move.

What Free actually includes

The plans page prices Free at $0 per month for writing without spelling and grammar mistakes. In the comparison table observed the same day, Free still shows core mistake checking and seeing writing tone, while Rewrite full sentences, Adjust your writing tone, Detect plagiarism, and Detect AI generated text are unavailable in the Free column. Generate text with AI prompts lists one hundred prompts per month on Free versus two thousand prompts per member per month on Pro. For a solo shipper, that means long-term free basics are real, but generative rewrite and risk detection sit behind both a quota and a feature wall.

Write “about one hundred AI prompts a month” into your copy budget. Launch weeks, hiring-email weeks, or fundraising weeks can burn the quota early; quiet weeks of short mail may stretch further. Do not assume Free offers unlimited tone rewriting—the table does not support that.

What Pro buys beyond Free

On the observation day, Pro is listed at $12 USD with a seven-day free-trial entry (email reminder before the trial ends; trust the live page). Marketing bullets highlight one-click full-sentence rewrites, easier tone control, fluent English help, unlimited personalized suggestions, plagiarism and AI-generated-text detection, plus two thousand AI prompts per month. Versus Free, the first payment usually buys two things at once: an order-of-magnitude larger prompt budget, and a professional writing posture with sentence-level rewrite, tone, and originality risk checks.

If you need Enterprise roles, SSO, DLP, or brand-tone governance, keep climbing; do not expect personal Pro to become a compliance suite. If you only spike occasionally, reserve prompts for final drafts instead of generating every sentence.

Signals that Free should step aside

Upgrade first when these show up: launch week burns the one hundred AI prompts and you still need CTA and email rewrites; you repeatedly need full-sentence rewrite or tone shifts that Free’s table blocks; partners ask for plagiarism or AI-detection checks; Grammarly is your primary writing assistant rather than an occasional spellcheck. You can also upgrade before the first paid overseas campaign so “sentence polish + plagiarism check” sits on the content checklist.

Stay on Free when you mostly fix short UI strings and mail, barely touch AI prompts, do not need plagiarism checks, and can route long essays elsewhere. After upgrading, confirm the plan tier, prompt balance, and that the browser extension is signed into the same Pro identity. Price against the live $12 plans-page display; trial and annual discounts follow checkout.

Spend Free quota on the sharp edge

Save the one hundred prompts for final paragraphs, not brainstorming every line. Draft structure yourself, then generate or rewrite only critical blocks. Let free corrections absorb spelling and grammar so prompts buy clarity and tone. Split long pieces instead of burning multiple prompts on one sprawling generation. If you are leaving vague CTAs only to save prompts, that is an upgrade signal, not a savings win.

Keep this separate from toolchain comparisons

Toolvori already has Grammarly versus DeepL Write for overseas English choice. That page answers selection. This page answers Free AI-prompt caps and Pro feature walls. Snapshot the official table with the 2026-10-03 date. Next time someone says “Grammarly free is enough,” ask whether one hundred monthly prompts plus plagiarism needs are acceptable—not whether commas can be fixed.

Common misreads versus the official table

Indies often hear “free spelling fixes” as “free ship-ready rewrites.” On the observation day the comparison table keeps full-sentence rewrite, tone adjust, plagiarism, and AI detection on the Pro side, while AI prompts read Free 100 / Pro 2,000. Decide by this week’s job: correction versus rewrite. If the job is rewrite and risk detection, Free’s capability set already mismatches—do not wait for quota zero to admit it. Another misread is treating the seven-day trial entry as permanent free capacity; that path is a Pro trial, then paid rules apply. Archive a same-day screenshot of grammarly.com/plans with this slug so chat folklore cannot overwrite the table.

If you also pay for DeepL Write or another polish tool, keep separate ledgers: Grammarly Pro buys an English writing-assistant and plagiarism posture, not machine-translation quota. Mixing tools is fine, but “I already pay elsewhere” is not evidence that Free should unlock sentence rewrite—the official table does not change.

How to use this in a shipping checklist

Copy the official numbers into your content checklist with the verification date and source URL. Keep only checkable items: still on Free; upgrade signals present; prompts reserved for finals; paid benefits match the blocker. Pay only when the boxes tick. Pin grammarly-free-indie-when-to-pro beside the plans page so folklore never replaces the live table. Revisit in ninety days: if paid prompts stay near zero, consider downgrading or changing process; if Free stays stable through discipline, write that discipline into the playbook.