Free Code Plagiarism Checker
Built for teachers and professors who need powerful code plagiarism detection.
Web plagiarism. AI/ChatGPT detection. Peer comparison. Unlimited group checks, free forever.
CS101 - Assignment 3
Leave the command line behind
MOSS and JPlag were built decades ago. Codequiry Desktop brings
plagiarism detection into the modern era.
Three types of detection.
One powerful app.
Local Plagiarism
Compare all submissions against each other. Perfect for detecting collusion between students in the same class.
- Peer-to-peer comparison
- Historical submissions
- Cross-class detection
Web Plagiarism
Search billions of web pages, GitHub repos, and Stack Overflow posts for matching code snippets.
- GitHub repository search
- Stack Overflow detection
- Pastebin & code sites
AI Plagiarism
Detect code generated by ChatGPT, Copilot, Claude, and other AI tools with our advanced detection model.
- ChatGPT detection
- GitHub Copilot patterns
- AI writing signatures
From folder to results in minutes
Simply sync your assignment folder. We'll handle the rest.
Sync your folder
Point the app to your assignment folder. We'll watch for new submissions automatically.
Choose detection type
Select local, web, AI, or all three. Configure sensitivity and language settings.
Review results
Get detailed reports with side-by-side comparisons, match highlighting, and exportable PDFs.
Every language your students use
Used by professors worldwide
"Finally, a tool that catches AI-generated code. My students thought they could use ChatGPT undetected. Not anymore."
"MOSS was a nightmare to set up every semester. Codequiry Desktop just works. Drag, drop, done."
"The web plagiarism feature found code copied straight from Stack Overflow. Game changer for my intro classes."
Common questions from educators
Is Codequiry Desktop really free?
Yes, 100% free forever. Unlike MOSS which has usage limits and requires email approval, Codequiry Desktop gives you unlimited group checks with no restrictions. No credit card, no trial period, no hidden fees.
How is this better than MOSS or JPlag?
MOSS (1994) and JPlag (1996) are command-line tools that only compare submissions locally. Codequiry Desktop adds:
- Web plagiarism detection — finds code copied from GitHub, Stack Overflow, and the web
- AI/ChatGPT detection — identifies AI-generated code
- Modern GUI — no command line needed, just drag and drop
- Folder sync — automatically watches for new submissions
- PDF reports — exportable reports for academic records
Can it detect ChatGPT and AI-generated code?
Yes. Our AI detection engine can identify code patterns from ChatGPT, GitHub Copilot, Claude, and other AI coding assistants. This is essential in 2024+ where students increasingly use AI tools for assignments.
What programming languages are supported?
51+ languages including Python, Java, JavaScript, C/C++, C#, Go, Rust, Swift, PHP, Ruby, TypeScript, SQL, MATLAB, R, and many more. We support virtually every language taught in computer science programs.
How do I check a class of student submissions?
Simply point Codequiry Desktop to your assignment folder. The app will automatically detect all submissions, compare them against each other, check the web for copied code, and flag any AI-generated content. Results are ready in minutes with side-by-side comparisons.
Is my students' code kept private?
Yes. Code is processed securely and never stored permanently. We follow GDPR, FERPA, and university data protection standards. Your students' submissions remain confidential.
Ready to modernize your
plagiarism detection?
Download now. Free forever. No credit card required.
Join thousands of educators who've already made the switch.