kitio.aiPlag vs TheChecker.AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Plag starts at See pricing page and TheChecker.AI starts at $9.90/mo. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Plagiarism check
- AI content detection
- Translated plagiarism detection
- 129 languages
- Private file handling
- Many file formats
- AI probability scoring
- Paragraph-level analysis
- PDF and document upload
- Text humanizer
- MCP tools for Claude
| Feature | Plag | TheChecker.AI |
|---|---|---|
| Best for | Plagiarism checker and AI content detector for documents | AI text detector with a humanizer and an MCP connector for Claude |
| Category | Writing | Writing |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | $9.90/mo |
| Free plan | Yes | Yes |
| Made by | Plag | TheChecker.AI |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Plag starts at See pricing page and TheChecker.AI starts at $9.90/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Monthly
$9.90/mo
- Unlimited AI detections
- 5,000 humanizer words a month
- PDF and document upload
Yearly
$99/yr
- Everything in Monthly
- Billed once a year
Enterprise
Contact sales
- LMS and API integration
- Bulk user management
- Advanced analytics
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Plag
- Files not stored in comparison databases
- Free originality scores
- Wide language coverage
- Full reports are priced by document length
- AI detectors can produce false positives
- No flat subscription price shown
TheChecker.AI
- Unlimited checks on the paid plan
- Works inside Claude through MCP
- Humanizer credits never expire
- Detection scores are probabilistic, not proof
- Humanizer words are capped each month
- Free option is only a demo
Which one should you choose?
Choose Plag if you want:
- Files not stored in comparison databases
- Free originality scores
- Wide language coverage
Watch out: full reports are priced by document length.
Choose TheChecker.AI if you want:
- Unlimited checks on the paid plan
- Works inside Claude through MCP
- Humanizer credits never expire
Watch out: detection scores are probabilistic, not proof.
Plag vs TheChecker.AI FAQ
What is the difference between Plag and TheChecker.AI?
Plag: Plagiarism checker and AI content detector for documents. TheChecker.AI: AI text detector with a humanizer and an MCP connector for Claude. Both are writing tools.
Is Plag or TheChecker.AI cheaper?
Plag starts at See pricing page and TheChecker.AI starts at $9.90/mo. Check both pricing pages for current plans.
Do Plag and TheChecker.AI have free plans?
Plag: Yes. TheChecker.AI: Yes.
Who makes Plag?
Plag is made by Plag.
Who makes TheChecker.AI?
TheChecker.AI is made by TheChecker.AI.
Which should I choose, Plag or TheChecker.AI?
Choose Plag if you value files not stored in comparison databases and free originality scores. Choose TheChecker.AI if you value unlimited checks on the paid plan and works inside claude through mcp.