Grammarly vs QuillBot 2026: Which AI Writer is Best?
Grammarly vs QuillBot 2026: we tested both for grammar, paraphrasing, AI writing and pricing. See which AI writing assistant fits your workflow.
Ira Poles
AI Expert · Toolsground
Grammarly vs QuillBot is one of the most common comparisons we get asked about at Toolsground, and for good reason. Both tools live inside your browser, both promise cleaner writing, and both have expanded aggressively into generative AI. But they started from very different places: Grammarly is a grammar and style editor that added AI writing, while QuillBot is a paraphrasing engine that added grammar checking. That origin story still shapes how each tool behaves in 2026.
We spent four weeks testing both tools side by side across real workloads: a 3,000-word academic essay, a batch of client emails, LinkedIn posts, a product landing page and a stack of research PDFs that needed summarizing. We tested the free plans and the paid tiers (Grammarly Pro and QuillBot Premium) in Chrome, Google Docs, Microsoft Word and the desktop apps. This guide is for students, freelance writers, marketers and professionals who want to know which one actually earns a spot in their workflow.
Quick picks - 2026
Grammarly vs QuillBot: Side-by-Side Comparison
| Feature | Grammarly | QuillBot |
|---|---|---|
| Core strength | Grammar, clarity, tone and style editing | Paraphrasing and rewriting |
| Free plan | Yes: spelling, grammar, punctuation, tone detection, 100 AI prompts/mo | Yes: paraphraser (125-word limit, 2 modes), grammar checker, summarizer (1,200 words) |
| Paid plan price | Pro: $12/mo billed annually ($30 monthly) | Premium: $8.33/mo billed annually ($19.95 monthly) |
| Team pricing | Enterprise: custom pricing | Team: from about $8/user/mo (annual) |
| Generative AI writing | Yes, 2,000 prompts/mo on Pro plus AI agents in Grammarly Docs | Yes, AI chat and Co-Writer, more limited |
| Paraphrasing modes | Basic rewrite suggestions | 9 modes including Academic, Formal, Creative, Expand, Shorten and Custom |
| Plagiarism checker | Included in Pro | Included in Premium (page limits apply) |
| AI detector | Yes, free | Yes, free |
| Summarizer | Via AI prompts | Dedicated tool |
| Citation generator | Basic citation help | Dedicated APA, MLA, Chicago generator |
| Integrations | Browser, Word, Google Docs, Outlook, desktop apps, mobile keyboard | Browser, Word, Google Docs, macOS app |
| Best for | Professionals, teams, non-native English writers | Students, researchers, content repurposing |
Grammarly Deep-Dive: The Best Editor for Polished Writing
Grammarly
Free + $12/moGrammarly remains the strongest real-time writing editor on the market. In our test essay, which we seeded with 40 deliberate errors, Grammarly caught 37, including subject-verb agreement buried in long clauses, dangling modifiers and inconsistent tense across paragraphs. QuillBot caught 29 of the same 40. The gap widened on style issues: Grammarly flagged passive voice, redundancy and overly long sentences, and its full-sentence rewrites were genuinely useful rather than mechanical.
The 2026 version leans heavily into AI. Grammarly Docs now includes AI agents that can predict reader reactions, suggest citations, check for AI-sounding text and grade a draft against a rubric. The tone detector was the standout for our email tests: it correctly flagged a client follow-up as sounding "demanding" and offered three friendlier versions in one click. Pro users get 2,000 generative AI prompts per month, which covered everything we threw at it, including drafting LinkedIn posts and reformatting meeting notes.
Integration is where Grammarly pulls far ahead. It works in Gmail, Slack, Notion, Word, Google Docs, Outlook and essentially any text box in your browser. The desktop app extends this to native apps on Windows and macOS, and the mobile keyboard brings it to your phone. QuillBot cannot match that coverage.
Pricing: The free plan covers spelling, grammar, punctuation and tone detection with 100 AI prompts per month. Grammarly Pro costs $12/mo billed annually or $30 month-to-month and adds full-sentence rewrites, tone adjustments, plagiarism detection, brand tones and 2,000 prompts. Enterprise plans use custom pricing and add admin controls, style guides, SSO and analytics.
- Most accurate grammar and style checking we tested
- Excellent tone detection and clarity rewrites
- Works almost everywhere you type
- Generous AI prompt allowance on Pro
- Plagiarism checker and AI detector built in
- Strong team features: style guides, brand tones, snippets
- Month-to-month pricing ($30) is steep
- Paraphrasing is basic compared to QuillBot
- Can over-suggest, flattening a distinctive voice
- No dedicated summarizer or citation generator
QuillBot Deep-Dive: The Best Paraphrasing Toolkit
QuillBot
Free + $8.33/moQuillBot's Paraphraser is still the best rewriting tool we have tested. Premium unlocks nine modes: Standard, Fluency, Natural, Formal, Academic, Simple, Creative, Expand and Shorten, plus a Custom mode where you describe the style you want. A synonym slider controls how aggressively words change, and you can freeze specific terms so technical vocabulary stays intact. When we fed it dense paragraphs from a research paper, Academic mode produced clean, readable rewrites that kept the meaning without sounding robotic.
What makes QuillBot compelling is the bundle. One subscription gets you the Paraphraser, a Summarizer that condensed a 6,000-word report into key bullet points in seconds, a Citation Generator for APA, MLA and Chicago, a Translator covering 45+ languages, an AI Detector, an AI Humanizer and a Plagiarism Checker. For students, that replaces three or four separate tools.
The Grammar Checker is solid on basics: typos, punctuation, simple agreement errors. It struggled with nuance, missing several misplaced modifiers and offering no tone feedback. QuillBot's Co-Writer and AI chat handle generative tasks adequately, but output was noticeably more generic than Grammarly's prompts for emails and marketing copy.
Pricing: The free plan limits the Paraphraser to 125 words per input and two modes, and the Summarizer to 1,200 words. QuillBot Premium costs $8.33/mo billed annually ($99.95/year), $13.33/mo on a semi-annual plan or $19.95 month-to-month. It unlocks unlimited paraphrasing, all modes, a 6,000-word summarizer, advanced grammar rewrites and plagiarism checks. Team plans start at about $8 per user per month on annual billing.
- Best-in-class paraphraser with nine modes and custom styles
- Excellent summarizer for research and long documents
- Built-in citation generator and translator
- Cheaper than Grammarly on every billing cycle
- Useful free plan for light paraphrasing
- Grammar checker misses nuanced errors
- No tone detection or brand voice controls
- Fewer integrations, no mobile keyboard
- Paraphrasing can raise academic integrity concerns if misused
- Generative AI output is more generic
When to Choose Grammarly
Choose Grammarly if your writing goes directly to other people and mistakes cost you credibility. That covers most professional use cases.
- You write a lot of email and Slack messages. The tone detector and in-app suggestions prevented several awkward messages during our testing.
- English is your second language. Grammarly's explanations teach you why something is wrong, and its fluency suggestions are more natural than QuillBot's.
- You manage a team or brand. Style guides, brand tones and snippets keep everyone consistent, which QuillBot does not offer.
- You need AI drafting with editing in one place. Grammarly Docs and 2,000 monthly prompts handle drafting, rewriting and proofreading in a single workflow.
- You work across many apps. If you write in Gmail, Notion, Word, Jira and your phone, Grammarly follows you everywhere.
A marketing manager we worked with during testing summed it up: QuillBot helped her generate variations, but Grammarly was what she trusted before hitting send.
When to Choose QuillBot
Choose QuillBot if your work involves transforming existing text rather than polishing original drafts.
- You are a student. Summarizing readings, generating citations and rephrasing notes into your own words are exactly what QuillBot does best, at a student-friendly price.
- You repurpose content. Turning a blog post into social captions, a newsletter or a shorter landing page section is fast with Shorten, Expand and Creative modes.
- You handle dense research. The Summarizer and Academic mode cut our time processing a stack of PDFs roughly in half.
- You write in multiple languages. The built-in translator and multilingual paraphrasing are useful for international teams and ESL writers drafting in their native language first.
- Budget matters. At $99.95/year, QuillBot Premium costs less than Grammarly Pro's annual plan and bundles more standalone tools.
One important note: paraphrasing tools can be misused to disguise plagiarism. Always cite your sources, and check your institution's AI policy before using QuillBot on graded work.
Verdict: Grammarly vs QuillBot in 2026
After four weeks of testing, our recommendation is clear: Grammarly is the better all-round AI writing assistant, and QuillBot is the better specialist tool for paraphrasing and research.
If you can only pay for one and you write emails, reports, client documents or marketing copy, pick Grammarly Pro. Its grammar accuracy, tone feedback, AI drafting and integrations make it the more complete daily driver. If you are a student or researcher who spends more time summarizing, rephrasing and citing than proofreading, QuillBot Premium delivers more value per dollar.
For heavy writers, the best setup is both: use QuillBot's free or Premium plan to rework source material, then let Grammarly handle the final polish. Combined, they cost about $20/mo on annual billing, less than many single AI writing subscriptions. Start with both free plans for a week, note which one you open most, and upgrade that one first.
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Written by
Ira Poles
AI Expert · Founder, Toolsground
Ira is an AI tools expert and the founder of Toolsground. She researches, tests, and reviews AI software to help individuals and teams find the right tools for their workflow.