Check-Plagiarism vs Copyscape
Check-Plagiarism
check-plagiarism.comCopyscape
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| Figure | Check-Plagiarism | Copyscape |
|---|---|---|
| Price from | $4.17/mo | $4.95/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 10 | 5 |
| Spec score · AI Plagiarism Checkers | 8.7 (#7) | 9.2 (#2) |
| Licence | The opened vendor pages describe a hosted commercial service and do not state an open-source licence. | The terms reserve copyright in the service and restrict copying and access to authorized users, so Copyscape is proprietary rather than open source. |
| Praise: ease and accuracy | G2 reviewers commonly praise easy use, useful reports and generally effective plagiarism or AI-content detection. | Independent reviewers repeatedly praise Copyscape as simple to use, quick, accurate for duplicate-content checks and useful for validating writers’ web content. |
| Purpose | The service checks text for plagiarism and reports duplicated sections, similarity percentages, and matching sources. | Copyscape checks web content and new human- or AI-generated content for plagiarism and duplicate text found online. |
| Rating on Capterra | 4.5 out of 5 from 2 reviews | 4.8 out of 5 from 71 reviews |
| Rating on G2 | 4.5 out of 5 from 13 reviews | 4.4 out of 5 from 27 reviews |
| Rating on GetApp | 4.5 out of 5 from 2 reviews | 4.8 out of 5 from 71 reviews |
| Rating on Trustpilot | 2.8 out of 5 from 4 reviews | 2.4 out of 5 from 6 reviews |
| Support | The API page advertises 24/7 support for selected API tiers and offers contact for integration questions. | Copyscape accepts questions, comments, and suggestions through its contact form. |
| What it does | The service checks submitted text against web, academic and publication sources and reports duplicated passages, similarity percentages and matching sources. | Copyscape searches online content for matching or copied text and supports originality checking for human- and AI-generated material. |
Plans
Check-Plagiarism
- Weekly$4.99, paid once
- Annual$8.33 a month
- API Basic$10 a month
- API Company$14.99 a month
- Monthly$14.99 a month
- Semi-Annual$16.66 a month
- API Basic Yearly Plan$50 a year
- API Business$50 a month
- API Company / Webmasters$99.99 a year
- API Business / Colleges / Universities$250 a year
Copyscape
- Free CopyscapeFree
- Copyscape Premium$0.03, paid once
- Copysentry Weekly protection$4.95 a month
- Copysentry Premium daily protection$19.95 a month
- Copyscape EnterprisePriced on request
In their own words
Check-Plagiarism
Check-Plagiarism is a plagiarism-checking service for students, teachers, researchers, content creators, and digital publishers. It accepts pasted or typed text and DOC, DOCX, TXT, or PDF uploads, with a listed maximum of 7,000 words per document. The checker reports duplicated passages, sentence-level matches, similarity percentages, and matching sources. Its AI is described as detecting paraphrased or lightly edited text as well as exact matches. The service says it checks billions of web pages and provides access to academic databases and publications, with support claimed for more than 20 languages. Reports can be downloaded or shared, including as PDF. Free online use is available with limited searches; registered accounts can increase the limit. Plans include Monthly at $14.99 a month and Annual at $8.33 a month, billed $99.99 every 12 months. API access and LMS integrations are listed.
Copyscape
Copyscape checks web pages and newly written human- or AI-generated content for plagiarism and duplicate text found online. Its free checker scans a URL and presents a word-by-word comparison of results, but shows no more than 10 search results and limits scans per website. Premium accepts pasted text as well as PDF and Word uploads for originality checks. Its Batch Search can process up to 10,000 pages in one operation, with each page billed like a regular search. The Premium API can automate plagiarism and AI checks and return results in JSON, XML, or HTML; a WordPress plugin supports checks in a WordPress workflow. Premium users can create a private index of their own content, accessible only through their Copyscape account. Copysentry monitors selected pages daily or weekly and emails alerts when it finds copies. Enterprise can be hosted on-premises or in a private cloud. Copyscape says it uses Google for search and then processes results with proprietary algorithms. It warns that AI detector results may misclassify human or AI text and should not be the sole basis for disciplinary action.