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Quick Verdict
Grammarly (79/100) is the better all-round writing assistant — grammar checking, tone detection, full-sentence rewrites, and GrammarlyGO’s AI writing features make it a complete package. QuillBot (71/100) is the better paraphrasing tool — 10 rewriting modes, a summariser, and a price point that undercuts Grammarly significantly. Choose Grammarly if you need comprehensive writing support across everything you write. Choose QuillBot if paraphrasing and rewording are your primary needs and budget matters.
Try Grammarly Free → | Try QuillBot Free →
Grammarly Overview
Grammarly is the category-defining grammar and writing assistant. With 93-98% accuracy on grammar, spelling, and punctuation, it’s the most reliable error-catching tool available. The Premium plan ($12/month) adds tone detection, full-sentence rewrites, vocabulary suggestions, and GrammarlyGO — an AI writing assistant that can draft, rewrite, and adjust tone on demand. The browser extension works everywhere: Gmail, Docs, LinkedIn, social media, and any web text field.
Score: 79/100 | Full Grammarly Review →
QuillBot Overview
QuillBot is a paraphrasing specialist. Its core function is taking existing text and rewording it — 10 modes (Standard, Fluency, Formal, Creative, Academic, and more) give fine-grained control over how text is restructured. It also includes a summariser, grammar checker, and citation generator. At approximately £3.33/month (annual), it’s one of the cheapest writing tools available. The limitation is scope — QuillBot is not a content generator or comprehensive writing assistant.
Score: 71/100 | Full QuillBot Review →
Head-to-Head Comparison
Grammar & Error Checking
Grammarly leads here by a significant margin. Its grammar engine catches errors with 93-98% accuracy across over 400 grammar rules, including nuanced issues like misplaced modifiers, subject-verb agreement in complex sentences, and comma splices. The suggestions include explanations of why something is wrong, which helps users learn.
QuillBot includes a grammar checker, but it functions as a secondary feature rather than a core strength. The error detection is competent but not as thorough or accurate as Grammarly’s purpose-built engine.
Winner: Grammarly — grammar checking is its core identity and it shows.
Paraphrasing & Rewriting
QuillBot is purpose-built for this and it shows. Ten rewriting modes give precise control over how text is restructured. Academic mode maintains formal register. Creative mode produces genuine variation. Fluency mode smooths awkward phrasing. The ability to adjust a “Synonym” slider controls how aggressively the tool rewrites — from minimal changes to complete restructuring.
Grammarly’s rewriting capabilities exist through GrammarlyGO, but they’re more limited. You can ask GrammarlyGO to rewrite a paragraph or adjust tone, but the fine-grained mode control that QuillBot offers doesn’t exist.
Winner: QuillBot — 10 specialised modes versus Grammarly’s general rewriting.
AI Writing Assistance
Grammarly’s GrammarlyGO can draft content from prompts, extend existing text, and adjust tone (professional, friendly, confident, etc.). It’s not a full content generator like Jasper or Copy.ai, but it handles quick drafting tasks within the editing workflow well.
QuillBot doesn’t offer AI content generation. Its role is transforming existing text, not creating new text from scratch. If you need to generate content, QuillBot isn’t the tool.
Winner: Grammarly — GrammarlyGO adds content generation; QuillBot only transforms existing text.
Pricing Comparison
| Feature | Grammarly | QuillBot |
|---|---|---|
| Free plan | Basic grammar/spelling | 2 modes, 125-word limit |
| Premium price | $12/mo | ~£3.33/mo (annual) |
| Annual price | $144/yr | ~£39.95/yr |
| Value proposition | Complete writing assistant | Specialist paraphrasing |
QuillBot is roughly one-third the price of Grammarly. The value question is whether you need Grammarly’s complete suite or just QuillBot’s paraphrasing focus.
Winner: QuillBot — significantly cheaper for its specific use case.
Who Should Choose Grammarly?
Choose Grammarly if you write across multiple platforms daily (email, documents, social media), want comprehensive error-catching across everything you type, need tone and style guidance, and want AI writing assistance for quick drafts. The $12/month covers a complete writing improvement toolkit.
Who Should Choose QuillBot?
Choose QuillBot if your primary need is paraphrasing — rewording academic papers, restructuring existing content, avoiding repetitive phrasing. If you’re a student, researcher, or writer who works mainly with existing text rather than generating from scratch, QuillBot’s specialist focus and lower price make it the better fit.
Our Recommendation
Grammarly is the better tool for most people. Writing assistance that works across every platform, catches errors reliably, and includes AI drafting covers more use cases than specialist paraphrasing. At $12/month, it’s affordable for the breadth of capability.
QuillBot is the better tool for paraphrasing-specific workflows. If rewording is your main activity and budget is tight, QuillBot’s focused toolset at ~£3.33/month is excellent value.
The ideal setup for heavy writers: both. Grammarly for error-catching and AI drafting, QuillBot for paraphrasing when you need it. Combined cost is still under $16/month.
FAQ
Can I use Grammarly and QuillBot together? Yes. Grammarly’s browser extension and QuillBot’s web app work alongside each other. Use QuillBot for paraphrasing, paste the result into your document, and let Grammarly catch any remaining errors.
Is QuillBot good for academic writing? Yes — the Academic mode maintains formal register and avoids colloquialisms. The citation generator adds APA, MLA, and Chicago-style citations. For students and researchers, QuillBot is a strong tool.
Does Grammarly work in Google Docs? Yes. The browser extension integrates with Google Docs, showing suggestions inline as you type. It also works in Microsoft Word (via add-in), Gmail, LinkedIn, and most web-based text fields.
Structured Data
Grammarly
| Field | Value |
|---|---|
| Tool Name | Grammarly |
| Category | AI Writing Tools |
| Overall Score | 79/100 |
| Core Performance | 86/100 |
| Ease of Use | 88/100 |
| Value for Money | 74/100 |
| Output Quality | 72/100 |
| Support & Reliability | 70/100 |
| Price From | $12/mo (Premium) |
| Free Plan | Yes |
| Best For | Best grammar checking with AI writing assistance |
| Affiliate Link | [AFFILIATE: grammarly] |
| Last Reviewed | April 2026 |
QuillBot
| Field | Value |
|---|---|
| Tool Name | QuillBot |
| Category | AI Writing Tools |
| Overall Score | 71/100 |
| Core Performance | 74/100 |
| Ease of Use | 80/100 |
| Value for Money | 82/100 |
| Output Quality | 58/100 |
| Support & Reliability | 54/100 |
| Price From | ~£3.33/mo (annual) |
| Free Plan | Yes |
| Best For | Best paraphrasing tool at a budget price |
| Affiliate Link | [AFFILIATE: quillbot] |
| Last Reviewed | April 2026 |
Last updated: April 2026