JPlag vs Plag
JPlag
jplag.ipd.kit.edu
Plag
plag.ieSide by side
| Figure | JPlag | Plag |
|---|---|---|
| Price from | Free | €14.95/mo |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 3 |
| Spec score · Plagiarism Checkers | 8.0 (#10) | 7.5 (#22) |
| Data handling | The project states that analysis runs locally and that source code and plagiarism results are not uploaded or sent externally. | The privacy policy identifies LINGUA INTELLEGENS, UAB as data controller and says personal data is generally processed and securely stored in the EU/EEA. |
| Founded | 1996 | 2011 |
| Headquarters | Karlsruhe, Germany | The privacy policy lists LINGUA INTELLEGENS, UAB at Palangos St. 4-101, Vilnius, Lithuania. |
| Support | The project directs users to report bugs and issues and provides [email protected] for other inquiries. | The contact page offers 24/7 chatbot support, while the FAQ says paid clients can access live chat staffed by human agents. |
Plans
In their own words
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.