kitio.aiQuillBot vs Check-Plagiarism
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Check-Plagiarism has the lower starting price: about $8 a month, against $20 for QuillBot.
Plagiarism checker with AI detector, paraphraser and grammar tools
Freemium · $14.99/moAt a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Paraphraser with multiple modes
- Grammar checker
- Summarizer
- AI detector
- Citation generator
- Plagiarism detection
- Sentence-level source matching
- AI content detector
- Paraphrasing tool
- Bulk file checks
- Plagiarism API
| Feature | QuillBot | Check-Plagiarism |
|---|---|---|
| Best for | Paraphraser with grammar checker, summarizer and citation tools | Plagiarism checker with AI detector, paraphraser and grammar tools |
| Category | Writing | Writing |
| Pricing model | Freemium | Freemium |
| Starting price | $19.95/mo | $14.99/mo |
| Free plan | Yes | Yes |
| Made by | Learneo | Check-Plagiarism |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Check-Plagiarism has the lower starting price: about $8 a month, against $20 for QuillBot.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- 125-word paraphrases
- 2 paraphrasing modes
- Grammar checker
Premium
$19.95/mo
- Unlimited paraphrasing
- All modes
- Advanced grammar suggestions
Team
Contact sales
- Everything in Premium
- Multiple users, one purchase
4 plans
Free
Free
- Limited searches
- Up to 1,000 words per search
- Ads shown
Weekly
$4.99/week
- 10,000 words
- 7,000 words per search
Monthly
$14.99/mo
- 35,000 words
- 20,000 words per search
- No ads, detailed reports
Annual
$99.99/yr
- 450,000 words
- All premium tools
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
QuillBot
- Many rewrite modes to choose from
- Generous free tier
- Several writing tools under one login
- Free plan limits word count per paraphrase
- Rewrites can change the meaning
- Heavy use raises academic integrity questions
Check-Plagiarism
- Free checks without an account
- Rewrite flagged text from the report
- API available on paid plans
- Free tier shows ads and captchas
- Free checks limited to 1,000 words
- Word quotas on every paid plan
Which one should you choose?
Choose QuillBot if you want:
- Many rewrite modes to choose from
- Generous free tier
- Several writing tools under one login
Watch out: free plan limits word count per paraphrase.
Choose Check-Plagiarism if you want:
- Free checks without an account
- Rewrite flagged text from the report
- API available on paid plans
Watch out: free tier shows ads and captchas.
QuillBot vs Check-Plagiarism FAQ
What is the difference between QuillBot and Check-Plagiarism?
QuillBot: Paraphraser with grammar checker, summarizer and citation tools. Check-Plagiarism: Plagiarism checker with AI detector, paraphraser and grammar tools. Both are writing tools.
Is QuillBot or Check-Plagiarism cheaper?
Check-Plagiarism has the lower starting price: about $8 a month, against $20 for QuillBot.
Do QuillBot and Check-Plagiarism have free plans?
QuillBot: Yes. Check-Plagiarism: Yes.
Who makes QuillBot?
QuillBot is made by Learneo, based in United States.
Who makes Check-Plagiarism?
Check-Plagiarism is made by Check-Plagiarism.
Which should I choose, QuillBot or Check-Plagiarism?
Choose QuillBot if you value many rewrite modes to choose from and generous free tier. Choose Check-Plagiarism if you value free checks without an account and rewrite flagged text from the report.