Copyleaks AI Detector vs Plagiarism Checker X
Copyleaks AI Detector
copyleaks.com
Plagiarism Checker X
plagiarismcheckerx.comSide by side
| Figure | Copyleaks AI Detector | Plagiarism Checker X |
|---|---|---|
| Price from | $13.99/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 12 | 3 |
| Spec score · Plagiarism Checkers | 9.2 (#1) | 8.0 (#11) |
| Spec score · AI Plagiarism Checkers | 9.2 (#1) | 8.1 (#8) |
| Headquarters | New York, NY, United States | 733 3rd Avenue, New York City, NY 10017, United States |
| Language support | AI detection supports more than 30 languages, while plagiarism detection supports more than 100. | The software interface is available in English, Spanish, French, German, Italian, Dutch, and Portuguese, and it supports content from hundreds of languages. |
| Purpose | The AI Detector identifies AI-written text, including text blended with human writing. | The desktop software checks documents and text for plagiarism and similarity against published web pages. |
| Who it serves | Copyleaks describes its users as including students, writers, professionals, creators, educational institutions, and enterprise teams. | The maker describes the product for students, teachers, writers, universities, colleges, and SEO agents. |
Plans
Copyleaks AI Detector
- PersonalPriced on request
- ProPriced on request
- Personal$16.99 a month
- Personal (monthly billing)$16.99 a month
- Pro$99.99 a month
- Pro (monthly billing)$99.99 a month
- Personal (annual billing)$167.88 a year
- Pro (annual billing)$899.88 a year
- EducationPriced on request
- EducationPriced on request
Plagiarism Checker X
- BasicFree
- Professional$39.95, paid once
- Business$147.95, paid once
In their own words
Copyleaks AI Detector
Copyleaks AI Detector identifies AI-written text, including writing that mixes AI and human passages. It supports more than 30 languages and names GPT-5, GPT-4, ChatGPT, Claude, Gemini, DeepSeek, Llama, Bloom, Rytr, and Jasper among the sources it detects. AI Logic explains flagged results, displays AI phrase frequency, and can identify text appearing in published content elsewhere. The web detector scans up to 25,000 characters without login; the website platform requires at least 255 characters and accepts up to 2,000 pages. A Chrome and Edge extension accepts 350 to 25,000 characters, and a Google Docs add-on and education LMS integrations connect it to other workflows. Personal costs $13.99 a year with annual billing or $16.99 a month; Pro costs $74.99 a year with annual billing or $99.99 a month. A free plan and free trial are listed. Copyleaks says data is encrypted at rest with AES-256, reports SOC 2 and SOC 3 certifications, and supports GDPR compliance.
Plagiarism Checker X
Plagiarism Checker X is Windows desktop software for checking documents and text against published web pages for plagiarism and similarity. Its online checker compares content with more than 16 billion pages. Bulk Comparison examines multiple documents in repositories, while Side-By-Side Difference places content in two windows to locate matching text. An AI detector indicates whether writing may have come from an AI tool or a human. A readability checker analyzes reading levels, extracts keywords and assesses difficulty. Reports mark matches with colors and references and can export to Word, PDF or Excel. The software accepts Word, PDF, text and other textual formats. Its interface is available in English, Spanish, French, German, Italian, Dutch and Portuguese, with content support for hundreds of languages. The maker says documents remain on the user’s computer and customer content is not copied, stored or sold. Basic is free with limited words and a daily search limit. Professional costs $39.95, paid once; Business costs $147.95, paid once.