AI writing assistants (ai writing) , by QuillBot, Inc. (Learneo) , since 2017
QuillBot
Paraphrasing, grammar, and summarizing suite with a 9-mode rewriter
- WEB
- EXTENSION
- PLUGIN
- MOBILE
What QuillBot does
Browser/web/plugin suite for paraphrasing, grammar checking, summarizing, and AI-text humanizing, plus a plagiarism checker and AI content detector. Owned by Learneo (Course Hero's parent company).
What you get: 9-mode paraphraser, Grammar checker, Summarizer, AI content detector, Plagiarism checker.
Typical jobs: Student paraphrasing/citation help; Quick grammar cleanup; Content summarization.
What users complain about: About 75% of AI-generated text run through QuillBot's paraphraser is still flagged by Turnitin's detector, with paraphrased passages averaging a 41% AI score (AI-detection testing discussions (r/stealthgpt and related))
Pricing and plan limits
Verified August 2026| Plan | Monthly | Annual (per mo) | Limits |
|---|---|---|---|
| Free | Free | Free | Paraphrase up to 125 words (2 modes), humanize up to 125 words (6 uses/day), 1,200-word summarizer, 20 AI chats, 3 AI images/day, 25,000 words/month plagiarism checker |
| Premium | $8.33 | $99.96 | Unlimited paraphrasing in 9 modes/23 languages, 6,000-word summarizer, 300 AI images/month, full AI Detector & humanizer access |
| Team | not disclosed | n/a | Custom, adds usage dashboard, centralized billing, priority support |
Where it wins
- Very low cost (~€8.33/mo on annual billing) for unlimited paraphrasing in 9 modes and 23 languages
- Generous free tier (125-word paraphrase, 1,200-word summarizer, 25,000-word/mo plagiarism checker)
- Backed by Learneo/Course Hero, giving longevity and integration with study tools
Where it falls short
- Humanizer/paraphraser is not built to evade AI detectors, roughly 75% of processed text is still reportedly flagged by Turnitin
- Free plan paraphrase limited to 125 words per run
- Official pricing page shows only the annual-equivalent monthly price; a separate month-to-month price isn't broken out on the same page
How we scored it
Full methodology| Criterion | Weight | Score | Contribution |
|---|---|---|---|
| Capability | 30% | 7.0 | 2.10 |
| Value for money | 25% | 8.0 | 2.00 |
| Ease of use | 15% | 8.5 | 1.27 |
| Maturity | 15% | 8.0 | 1.20 |
| Support & docs | 10% | 7.0 | 0.70 |
| Momentum | 5% | 7.0 | 0.35 |
| Weighted total | 100% | 7.6 | 7.60 |
Alternatives to QuillBot
Chosen by editors, not sponsors
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