| Website | quillbot.com | grammarly.com |
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| Category | AI Writing | AI Writing |
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| Use cases | AI for Bloggers, AI for Students | AI for Bloggers, AI for Students |
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| Pricing model | Freemium | Freemium |
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| Starting price | From $8.33 per month | From $12 per month |
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| Platforms | Android, Browser Extension, iOS, macOS, Web, Windows | Android, Browser Extension, iOS, macOS, Web, Windows |
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| Key features | - Paraphraser with 9 modes plus custom modes
- Paraphrasing in 23 languages
- Grammar checker in 6 languages with tone insights
- Summarizer (1,200 words free, 6,000 on Premium)
- Plagiarism checker (25,000 words/month on Premium)
- AI detector and AI humanizer
- Citation generator
- Translator for 40+ languages
+2 more on the tool page | - Real-time grammar, spelling and punctuation checks
- Tone detection and tone adjustment
- Full-sentence and paragraph rewrites
- Generative AI prompts (100 free, 2,000 on Plus/Pro)
- Plagiarism and AI-generated text detection
- Free AI Detector, no sign-up
- Humanizer and AI Detector agents
- Fluency help for English learners
+2 more on the tool page |
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| Integrations | - Google Chrome extension
- Microsoft Edge extension
- Safari extension
- Microsoft Word add-in
- Windows and macOS apps
- Android and iOS keyboards and apps
| - Google Docs
- Microsoft Word and Outlook
- Google Chrome, Edge, Firefox and Safari
- Windows and Mac desktop apps
- iPhone and Android keyboards
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| Best for | Students, researchers and bloggers who paraphrase, summarize, check plagiarism and cite sources on a budget | Students, professionals, bloggers and non-native English writers who want instant grammar, tone and clarity fixes wherever they write |
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| Pros | - All-in-one toolkit: paraphraser, grammar, summarizer, plagiarism, citations
- Affordable Premium: $8.33/month (US) or ₹334/month (India), billed annually
- Paraphrasing in 23 languages and many modes
- Pause your subscription instead of canceling
- Works in Word, browsers and on phones
| - Generous free plan with tone detection
- Works in browsers, Word, Google Docs and phone keyboards
- Affordable: Pro $12/month in the US, Plus ₹392/month in India
- Free AI Detector with no sign-up
- SOC 2 Type 2 report; never sells user content
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| Cons | - Free plan paraphrases only 100 words at a time in 2 modes
- Uses inputs to train its AI by default (opt-outs available)
- Plagiarism checks capped at 25,000 words a month
- Premium price is shown for annual billing only
- Paraphrased text still needs a human check for meaning
| - Full-sentence rewrites and plagiarism checks need a paid plan
- Free plan limited to 100 AI prompts a month
- English only
- Uses your writing to improve its products unless you change the controls
- AI detection is not 100% accurate (Grammarly says so itself)
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Quillbot
Grammarly