Tech riderRev. 29 Sept 2026

JPlag

Ch 117.0of 28 Plagiarism Detection Software

1Runs onAPI, Linux, Mac, self-hosted, Windows
2CostsFree plan
3AI detectionNo
4LMS integrationsNo
5API accessYes
6Browser extensionNo

6 lines stated Written from the maker's own pages: github.com

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Overview

JPlag is ranked #11 of 28 in plagiarism detection software on Specifiction. It runs on API, Linux, macOS, Self-hosted, Windows. There is a free plan.

JPlag plans and pricing

All plans

JPlag Free Open-source software · runs locally · requires Java SE 25 github.com · 29 Sept 2026

Compared on plagiarism detection software

Free plan: Yesgithub.com
AI detection: Nogithub.com
LMS integrations: Nogithub.com
API access: Yesgithub.com
Browser extension: Nogithub.com

Facts

Purpose: JPlag finds pairwise similarities among programs to detect source-code plagiarism and collusion.github.com · 29 Sept 2026
How it compares: It analyzes programming-language syntax and program structure, which helps it detect similarities despite some obfuscation attempts.github.com · 29 Sept 2026
Local processing: The project says analysis runs on the user's machine and sends no data externally.github.com · 29 Sept 2026
No internet search: JPlag compares submissions with one another and does not compare them against the internet.github.com · 29 Sept 2026
Languages: The README lists support for Java, C, C++, C#, Python, JavaScript, TypeScript, Go, Kotlin, R, Rust, Swift, Scala, LLVM IR, Scheme, EMF, SCXML, text, and multi-language submissions, with varying maturity levels.github.com · 29 Sept 2026
Interfaces: JPlag can be used through its command-line interface or Java API, and the CLI can launch the report viewer.github.com · 29 Sept 2026
Integration: JPlag is published on Maven Central for inclusion as a dependency in Java projects.github.com · 29 Sept 2026
Report limit: The report's top list and code comparison include at most 2,500 pairs by default; this limit can be changed with the -n option.github.com · 29 Sept 2026
Sensitivity: Lowering the minimum matching-token length increases sensitivity but may also increase false positives.github.com · 29 Sept 2026
Use cases: The project describes use in programming education and says it can also identify duplicated or slightly modified software parts.github.com · 29 Sept 2026
Runtime requirement: The README says Java SE 25 is required to run or build JPlag.github.com · 29 Sept 2026
Support: The project directs users to report bugs and issues on GitHub and provides a Q&A discussion section.github.com · 29 Sept 2026
Project history: JPlag was originally developed at Karlsruhe Institute of Technology in 1996 and is maintained primarily by KIT researchers.github.com · 29 Sept 2026