Copyscape vs JPlag
Copyscape
copyscape.comJPlag
jplag.ipd.kit.eduSide by side
| Figure | Copyscape | JPlag |
|---|---|---|
| Price from | $4.95/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 5 | 1 |
| Spec score · Plagiarism Checkers | 9.2 (#2) | 8.0 (#10) |
| Founded | Crunchbase lists the company as founded in 2003. | 1996 |
| Headquarters | Crunchbase lists Copyscape in Tel Aviv, Israel. | Karlsruhe, Germany |
| Integration | Copyscape provides a WordPress plugin for integrating Premium checks into a WordPress workflow. | JPlag is available as a dependency from Maven Central for inclusion in Java projects. |
| Purpose | Copyscape checks web content and new human- or AI-generated content for plagiarism and duplicate text found online. | JPlag finds pairwise similarities among programs to detect source-code plagiarism and collusion. |
| Support | Copyscape accepts questions, comments, and suggestions through its contact form. | The project directs users to report bugs and issues and provides [email protected] for other inquiries. |
Plans
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
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.
JPlag
JPlag is free, open-source software for finding pairwise similarities among submitted programs. It examines program syntax and structure to help detect source-code plagiarism and collusion, especially in student programming exercises, and can also identify duplicated or stolen software parts. It does not compare submissions with the internet. Supported inputs include Java, C, C++, C#, Python, JavaScript, TypeScript, Go, Kotlin, R, Rust, Swift, Scala, LLVM IR, Scheme, EMF, SCXML, text, and multi-language projects. JPlag runs locally, with the project stating that source code and plagiarism results are not sent externally. You can use its command-line interface, Java API, or Maven Central dependency. A bundled report viewer opens generated or existing reports. Base-code directories can exclude shared starter code, while matching-token sensitivity is adjustable. The default report lists up to 2500 comparison pairs, configurable with -n. Running or building it requires Java SE 25.