Grammarly vs QuillBot: Which Writing Tool Fits You in 2026
One is an always on checker with enterprise security, the other a cheap paraphrasing toolkit. Here is how they compare on the published facts.
By , research by the BestBots team · Updated Oct 18, 2026
Fact checked against each company's published pricing, documentation and verified user ratings. How we score
Pick Grammarly if you want an always on checker inside email, docs and your browser, writing in many languages, or a tool your IT team will approve. Pick QuillBot if you mainly paraphrase, summarize and check papers for plagiarism on a budget: $8.33 per month on annual billing against Grammarly's $12.
Side by side
| Spec | Grammarly | QuillBot |
|---|---|---|
| BestBots Score | 4.5 | 4.4 |
| Starting price | $30 per month | $19.95 per month |
| Pricing model | per seat | per seat |
| Free trial | Free Pro trial, length shown at checkout | None listed |
| Free plan | Yes, basic grammar and spelling plus 100 AI prompts per month | Yes, 100 word paraphrase and humanizer limits, 1,200 word summaries |
| Paid from | $12 per month billed annually; $30 billed monthly | $8.33 per month billed annually ($99.95); $19.95 billed monthly |
| Word or credit limits | No word cap listed; AI prompts: 100 per month Free, 2,000 per member Pro, unlimited Enterprise | Premium: unlimited paraphrasing, 6,000 word summaries, 25,000 plagiarism words per month |
| Plagiarism checker | Pro and up, against 16 billion+ web pages and ProQuest academic papers | Premium, 25,000 words per month in 100+ languages; more words can be bought |
| Brand voice | 1 style guide and 1 brand tone on Pro; unlimited on Enterprise | No brand voice; unlimited custom paraphrase modes on Premium |
| Browser extension | Yes, plus Windows and Mac desktop apps and an iOS keyboard | Chrome, Edge and Safari, plus Word add-in and Mac, Windows, iOS and Android apps |
| Languages | Spelling and grammar in 23 languages; advanced suggestions in English, Spanish, French, German, Portuguese and Italian | Paraphrase in 23 languages, grammar in 6, translation into 40+ |
The short answer
- Grammarly wins for professionals, multilingual writers and regulated teams. It runs everywhere you type, checks spelling and grammar in 23 languages, includes 2,000 AI prompts on Pro and publishes SOC 2, HIPAA and FedRAMP.
- QuillBot wins for students and budget writers. It bundles a 9 mode paraphraser, 6,000 word summarizer, humanizer, AI detector and 25,000 plagiarism words a month for $99.95 a year, and has the better user ratings.
Pricing
| Grammarly | QuillBot | |
|---|---|---|
| Free plan | Spelling, grammar, tone, 100 AI prompts per month | 100 word paraphrase and humanizer, 1,200 word summaries |
| Monthly | $30 | $19.95 |
| Quarterly | $60 ($20 per month) | $39.95 ($13.31 per month) |
| 6 months | $79.95 ($13.33 per month) | |
| Annual | $144 ($12 per month) | $99.95 ($8.33 per month) |
| Teams | Pro per member, 1 to 149 seats; Enterprise by quote | Team plan by quote, discount from 5 members |
QuillBot is cheaper on every term. On annual billing the gap is $44.05 a year; on monthly billing it is $10.05 a month. Grammarly's quarterly plan at $60 is the cheapest way to get Grammarly Pro for one academic term. Grammarly is also sold inside the Superhuman suite, whose Pro tier lists at $15 per member monthly or $12 annually.
Details: Grammarly pricing and QuillBot pricing.
Models and features
| Feature | Grammarly | QuillBot |
|---|---|---|
| Grammar and spelling languages | 23 (advanced suggestions in 6) | 6 |
| AI prompts | 100 Free, 2,000 Pro, unlimited Enterprise | AI Chat, limited Free, higher on Premium |
| Paraphrasing | Sentence and paragraph rewrites, tone adjustment | 9 modes plus unlimited custom modes, 23 languages |
| Plagiarism | Pro: 16 billion+ pages and ProQuest papers | Premium: 25,000 words per month, 100+ languages |
| AI detection | Pro, plus Authorship | Premium, full access |
| Humanizer | Not listed as a separate tool | Yes, 100 words Free, full on Premium |
| Summarizer | Not listed | 1,200 words Free, 6,000 Premium |
| Translation | 19 languages inline | 40+ languages |
| Brand controls | 1 style guide and 1 brand tone on Pro | None on Premium |
| Apps | Browser extensions, Windows, Mac, iOS keyboard, Word, Outlook, Google Docs | Chrome, Edge, Safari, Word, Mac, Windows, iOS and Android |
| Trustpilot | 3.1 from 10,479 | 4.8 from 14,537 |
Neither vendor names the underlying AI models on its pricing pages.
Head to head scenarios
Writing email and docs all day at work
Winner: Grammarly. It underlines issues inside Outlook, Gmail, Slack and Google Docs without copy and paste, adjusts tone on Pro and applies a shared style guide and brand tone across a team. QuillBot has extensions too, but it is built around pasting text into its tools.
Student writing research papers
Winner: QuillBot. $99.95 a year buys paraphrasing, summaries for long sources, a citation generator, an AI detector and 25,000 plagiarism words a month, and you can pause billing over summer. Grammarly's ProQuest database is a strong plagiarism source, but at $144 a year without a summarizer it is the more expensive way to cover the same ground.
Rephrasing text you did not write well the first time
Winner: QuillBot. Nine built in modes such as Academic and Simple, unlimited custom modes, a synonym slider and side by side comparison give more control than Grammarly's rewrite suggestions. It works in 23 languages for paraphrasing.
Writing in a language other than English
Winner: Grammarly. Spelling and grammar cover 23 languages, including Polish, Korean, Hindi, Turkish and Ukrainian, against QuillBot's 6 for grammar. For paraphrasing alone, QuillBot's 23 languages close the gap.
A team with security review
Winner: Grammarly. SOC 2 Type 2, ISO 27001, ISO 27701, ISO 42001, HIPAA and FedRAMP are published, training opt out is in settings, and Enterprise adds BYOK, DLP and SCIM. QuillBot's Team plan lists data control, but we could not verify its certifications.
Lowest cost for a full toolkit
Winner: QuillBot. No other tool here bundles a plagiarism checker, paraphraser, humanizer, detector and summarizer for $8.33 per month.
Privacy
Grammarly states it does not sell user content, makes money from subscriptions, and lets every user opt out of model training. It publishes the broadest certification list among writing tools. QuillBot is owned by Learneo, Inc. and links a Trust Center, but its pages block automated access and we could not confirm specific certifications or its training policy. For confidential or regulated material, Grammarly is the safer published choice.
Verdict
These tools solve different problems. Grammarly is a checker and assistant that lives in your workflow, and its 23 language coverage and security paperwork make it the professional default. QuillBot is a rewriting and research toolkit with the best price and the best user reviews in the category.
If you can only buy one: professionals should buy Grammarly Pro on annual billing, students should buy QuillBot Premium annually. A practical combination is Grammarly Free for everyday checks plus QuillBot Premium for paraphrasing and plagiarism, at $99.95 a year in total. Read the full Grammarly review and QuillBot review.
Frequently asked questions
Is QuillBot better than Grammarly?
QuillBot is better for paraphrasing, summarizing and price: $8.33 per month on annual billing with 9 paraphrase modes. Grammarly is better as an always on grammar and tone checker across email, docs and browsers, with 23 languages and stronger security certifications.
Which is cheaper, Grammarly or QuillBot?
QuillBot. Premium is $19.95 monthly or $99.95 a year, against Grammarly Pro at $30 monthly or $144 a year. Over a year on annual billing, QuillBot saves $44.05.
Which is better for students?
QuillBot for most students: cheaper, with a paraphraser, summarizer, citation generator and 25,000 plagiarism words a month, and you can pause billing over breaks. Pick Grammarly if your school provides it or if you need Authorship to show how your paper was written.
Do I need both Grammarly and QuillBot?
Usually not. Grammarly's free plan plus QuillBot Premium is a common low cost combination: Grammarly underlines errors everywhere for free, and QuillBot handles paraphrasing, summaries and plagiarism for $8.33 per month.
Which plagiarism checker is better?
Grammarly checks against more than 16 billion web pages plus ProQuest academic databases with no published cap. QuillBot checks against billions of internet sources in 100+ languages, with 25,000 words per month included. For academic work in English, Grammarly's ProQuest coverage is the stronger published claim.
Which is safer for work documents?
Grammarly. It publishes SOC 2 Type 2, ISO 27001, ISO 27701, ISO 42001, HIPAA and FedRAMP and lets you opt out of model training. We could not verify QuillBot's certifications from pages we could open.