Freedom251 › AI Plagiarism Checkers
Plagius
What Plagius is
Plagius analyzes academic papers and other documents for suspected plagiarism by searching the internet or local files. It accepts Word, PDF, OpenOffice, PowerPoint, HTML, RTF, and plain-text files. Reports identify suspicious phrases and sources, show URLs with similarity percentages, estimate suspected-plagiarism percentages, and provide analysis quality indicators; results can be viewed in a browser or exported as HTML. Its V5 AI detector assesses paragraphs in context and reports an AI-generation probability and confidence level. The site says detection recognizes signals from more than 15 models, including Gemini 3.7, GPT 5.6, and Claude 5. Professional desktop features include local searches across computer files or network shares, batch analysis, URL analysis, and comparisons between files. The maker says desktop analysis is local and does not send an entire document to its servers. External searches may send fragments of text, usually 7 to 13 words, and AI detection may send isolated paragraphs that are deleted within up to 48 hours. A free demo activation key is available, but it displays only some analysis results. The maker cautions that automated results require manual review.
Who it suits
Plagius suits people reviewing academic or other documents for possible plagiarism, including those who need local or batch comparisons. Users handling sensitive material should consider its notes about text fragments sent for external searches and AI analysis.
What it does well
- Reports suspicious phrases, sources, and similarity percentages.
- Supports Word, PDF, OpenOffice, PowerPoint, and other formats.
- Professional desktop plans include local and batch comparisons.
- Free email support is listed.
- Offers AI-generation probability and confidence information.
What to know first
- Demo shows only some result information.
- External searches may send text fragments to search engines.
- AI detection may send paragraphs to Plagius servers.
- Automated results cannot confirm plagiarism without manual review.
Limits
The demo runs analysis but displays only some result information. Plagius Basic costs $6.90 per one-time payment, lasts 30 days, runs on one Windows computer, and excludes AI detection; Plagius One plans use monthly credit quotas of 8,000, 20,000 or 50,000 credits.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Plagius One Advanced | $128.40 per year (= $10.70/month, billed annually) · 240,000 credits · Plagiarism check · AI detection · Free email support | $128.40 a year |
| Plagius One Advanced | Recurring monthly billing; automatic renewal until cancellation · 20,000 credits · Plagiarism check · AI detection · Free email support | $15.50 a month |
| Plagius Pro 12 | One-time payment; license valid for 12 months · One computer · Windows and macOS · Local and batch comparison · Unlimited analyses · AI detection · URL analysis · Free support | $15.90, paid once |
| Plagius Pro 24 | One-time payment; license valid for 24 months · One computer · Windows and macOS · Local and batch comparison · Unlimited analyses · AI detection · URL analysis · Free support | $22.90, paid once |
| Plagius One Professional | $294.00 per year (= $24.50/month, billed annually) · 600,000 credits · Plagiarism check · AI detection · Free email support | $294 a year |
| Plagius One Professional | Recurring monthly billing; automatic renewal until cancellation · 50,000 credits · Plagiarism check · AI detection · Free email support | $35 a month |
| Plagius One Basic | $58.80 per year (= $4.90/month, billed annually) · 96,000 credits · Plagiarism check · AI detection · Free email support | $58.80 a year |
| Plagius Basic | One-time payment; license valid for 30 days · One computer · Windows only · Internet plagiarism search · No AI detection · Free support | $6.90, paid once |
The first 8 of 9 plans, as plagius.com lists them, read 3 Oct 2026. The maker's own page has the final word. Every plan
Getting started
- Open the Plagius website
- Choose the desktop software or Plagius One browser option
- Select a plan or request the free demo activation key
- Install the desktop application, or use Plagius One without installation
- Load a supported document and run an analysis
Verdict
Plagius combines document similarity checks with an AI-generation estimate and detailed reports. Its results are indicators for review, not confirmation, and the maker advises against external searches for sensitive or confidential data.
Questions
Does Plagius have a free plan?
No. A free demo activation key is available, but the demo shows only some result information.
What platforms does Plagius support?
Plagius lists macOS, web and Windows. Plagius Basic is Windows-only; Pro 12 and Pro 24 support Windows and macOS.
What does Plagius cost?
Pricing starts from $6.90. Listed plans include $6.90 one-time Basic, $15.90 or $22.90 one-time Pro licenses, and monthly Plagius One plans from $7.00 to $35.00.
Does Plagius detect AI writing?
Yes. V5 reports an AI-generation probability and confidence level, and the site says it recognizes signals from more than 15 models.
Does Plagius integrate with LMS platforms?
No. LMS integrations are listed as no.
Facts from Plagius's own pages
- AI data handling
- The AI detection feature may send isolated document paragraphs to Plagius servers, where excerpts are deleted within up to 48 hours after analysis. · plagius.com, 3 Oct 2026
- AI detection
- The V5 model analyzes paragraphs in context and reports an AI-generation probability and confidence level. · plagius.com, 3 Oct 2026
- AI model coverage
- The site says AI detection recognizes signals from more than 15 models, including Gemini 3.7, GPT 5.6 and Claude 5. · plagius.com, 3 Oct 2026
- Credit unit
- Plagius One says one credit is equivalent to analyzing one word. · plagius.one, 3 Oct 2026
- Desktop processing
- The maker says desktop analysis is performed locally and the full document is not sent in its entirety to its servers. · plagius.com, 3 Oct 2026
- External searches
- Plagius says search engines may receive fragments of analyzed text, usually 7 to 13 words, and advises against using external searches for sensitive or confidential data. · plagius.com, 3 Oct 2026
- File formats
- Supported formats include Word, PDF, OpenOffice, PPT, HTML, RTF and plain text. · plagius.com, 3 Oct 2026
- Headquarters
- Porto Alegre, Brazil · plagius.com, 28 Sept 2026
- Plagius One availability
- Plagius One is browser-based, requires no installation, and the site says access is initially limited and by invitation. · plagius.one, 3 Oct 2026
- Professional features
- Professional includes local search across computer files or network shares, batch analysis, direct URL analysis and cross-comparison between files. · plagius.com, 3 Oct 2026
- Purpose
- Plagius Desktop analyzes academic papers and documents for suspected plagiarism by searching the internet or local files. · plagius.com, 3 Oct 2026
- Reports
- Reports show suspicious phrases and sources, URLs with similarity percentages, suspected-plagiarism percentages and analysis quality indicators; results can be opened in a browser or exported as HTML. · plagius.com, 3 Oct 2026
- Support
- The maker advertises free email support and lists [email protected] for help. · plagius.com, 3 Oct 2026
- Trial
- A free demo activation key is available; the demo runs the analysis but displays only some result information. · plagius.com, 3 Oct 2026
- Usage caveat
- The maker says automated results cannot confirm plagiarism on their own and highlighted passages should be manually reviewed. · plagius.com, 3 Oct 2026
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