Grammarly vs QuillBot
Editing-first vs rewording-first: Grammarly checks grammar, spelling and tone wherever you type (browser, desktop, mobile) and adds full-sentence rewrites plus plagiarism and AI-text detection on Pro; QuillBot is built around paraphrasing with 9 modes, a summarizer and a citation generator, and its annual plan is 31% cheaper ($99.95 vs $144). We did not run a hands-on editing or paraphrase quality test, so no quality ranking is claimed.
| Decision point | Grammarly | QuillBot |
|---|---|---|
| Best suited to | Editing an existing draft for clarity, tone, grammar, and concise rewrites. | Trying alternative wording for a short draft and comparing revisions against the original. |
| Plans and cost | Free is listed at $0 with 100 AI prompts per month. Pro shows 2,000 prompts per member/month and $12/month billed annually equivalent; official support lists $30 monthly, $60 per quarter, or $144 annually per member. | A free plan and Premium are listed. Premium pricing depends on region and plan; official page views showed different annual amounts, so confirm the current local checkout price. |
| Limitations | Suggestions can change intended meaning. Generative prompt allowances and prices depend on plan and billing period; review the current plan terms. | Paraphrasing can change meaning, so check each revision. Official pages currently differ on the free word cap and displayed annual price, and limits vary by tool and platform. |
Use the same input
Take a 1,000-word English draft, run it through the free tier of both tools for corrections, then paraphrase one paragraph into a formal tone and check whether the paid tier is needed for the job.
What a successful result must preserve
The tool must cover the user's actual bottleneck — fixing mistakes as they type, or rewording passages on demand — within the free tier's limits, or justify its annual price.
Evidence and test status
Official specification comparison. Grammarly prices (Free $0; Pro $30/mo monthly, $60/quarter, $12/mo annual = $144/yr; 2,000 AI prompts/mo; free tier 100 prompts/mo) and QuillBot prices (Free $0 with 125-word paraphrases and 2 modes; Premium $19.95/mo, $39.95/quarter, $99.95/yr; plagiarism checker 25,000 words/mo; summarizer 6,000 words) come from both companies' official pricing and feature pages, re-checked 2026-10-24. We did not run a seeded-error or blind paraphrase-scoring test; no quality ranking is claimed.
- Grammarly — Official Grammarly plans and prompt limits ↗ (reviewed 2026-10-15), Official desktop product guide ↗ (reviewed 2026-10-15), Official Pro pricing by billing period ↗ (reviewed 2026-10-15), Official AI setting and detector guidance ↗ (reviewed 2026-10-15)
- QuillBot — Official QuillBot Premium features and pricing ↗ (reviewed 2026-10-15), Official Free and Premium paraphraser limits ↗ (reviewed 2026-10-15), Official Premium billing and regional price guidance ↗ (reviewed 2026-10-15)