The World's Best Code Plagiarism Detection
Finally, code detection that
actually works
No plagiarized code escapes our detection
Detecting all code plagiarism
with Zeus AI Engine
Upholding academic integrity
in computer science
Scan trillions of code sources, detect AI-written code by ChatGPT, and identify peer-to-peer collaboration. Trusted by universities worldwide.
Introducing Zeus
AI-powered, language-agnostic code plagiarism detection
Language-Agnostic
Works with any file type
Cross-Language
JS ↔ Python ↔ Java ↔ C++
Variable Renaming
Catches renamed variables
Code Restructuring
Detects reordered logic
Zero Dependencies
Pure, self-contained
Blazing Fast
Pure JS implementation
New AI Powered Engine
Zeus is in Beta
The World's Best Source Code Plagiarism Detection
Purpose-built for source code. Advanced detection that understands programming logic, catches AI-generated code, and scans the entire web.
Deep Code Analysis
Understands syntax, logic, and structure. Detects plagiarism even with renamed variables and restructured code.
Trillion+ Web Sources
Scans GitHub, Stack Overflow, Chegg, GitLab, and millions of code repositories in real-time.
AI Code Detection
Industry-leading detection for ChatGPT, GitHub Copilot, Claude, and all AI-assisted code generation.
Peer Comparison
Cross-submission analysis that catches collusion, unauthorized collaboration, and contract cheating.
Smart Reports
Side-by-side diffs with syntax highlighting. Clear evidence for academic integrity cases.
60+ Languages
Python, Java, C++, JavaScript, Go, Rust, and every major programming language supported.
"Before Codequiry, I was manually reviewing submissions and couldn't reliably detect AI-generated code or copied solutions from GitHub and Stack Overflow. The open-source tools we tried weren't effective. Codequiry's reports show similarity scores up to 99% with side-by-side comparisons, and students can access their own reports. I don't need to have those conversations anymore—the evidence speaks for itself. When a student sees their code matched to a source with a 97% similarity score, there's no dispute. It's saved me significant time, and more importantly, students are actually writing their own code now instead of copying solutions."
Complete protection, stacked in your favor
Four specialized detection engines work in parallel. Together they catch what no single tool can.
Peer Comparison
Compares all submissions using AST-level tokenization. Catches renamed variables and reordered functions.
Web Source Scan
Checks against GitHub, Stack Overflow, Chegg, and billions of indexed sources. Direct URL tracking.
AI Code Detection
Identifies patterns from ChatGPT, Claude, Copilot. Updated weekly as models evolve.
AI Analysis Engine
Synthesizes findings, scores risk, presents clear evidence. You make the final call.
Comprehensive coverage for thorough academic review
Global Web Search
Real-time indexing across trillions of web pages, updated continuously
Git Repositories
Complete coverage of GitHub, GitLab, Bitbucket, and private repos
Stack Overflow
Every question, answer, and code snippet indexed and searchable
Homework Help Sites
Chegg, Course Hero, Quizlet, Bartleby, and solution databases
Code Archives
Google Code, SourceForge, academic databases, and historical code
Historical Matching
Cross-semester and cross-institution submission comparison
Codequiry Database
Proprietary database of hundreds of millions of code submissions
Dev Communities
Pastebin, CodePen, JSFiddle, Replit, and developer forums
Everything you need to protect academic integrity
Purpose-built for computer science education. Not a text plagiarism tool with code features bolted on—a true code-first platform.
Side-by-Side Comparison
Line-by-line diff viewer with syntax highlighting, similarity scoring, and one-click navigation between matched sections. Clear documentation for academic integrity reviews.
Visual Clustering
Interactive 2D diagrams that reveal collaboration patterns at a glance. Visualize submission relationships, identify unexpected similarities, and understand how code was shared.
AI Code Detection
Machine learning models trained to identify ChatGPT, Copilot, and AI-generated code patterns. Updated weekly as AI models evolve. Sees what humans can't.
10-Minute Results
Cloud-powered analysis across billions of sources delivers comprehensive reports while you wait. Process 500 submissions in under 10 minutes. No queues, no waiting.
Source URL Tracking
When we find a match, we show you exactly where it came from. Direct links to the source page, file, or repository. Complete transparency for fair conversations with students.
Public API
Powerful REST API for custom integrations. Build your own workflows, integrate with your systems, and automate code checking at scale.
See why leading universities switched to Codequiry
Why educators love us
Trusted by 500+ institutions worldwide
"I came across Codequiry through an ad, but it proved as a life saver in my CS course. I had no way to check if students were submitting original source code, now I do. And the results are amazing."
"MOSS kept timing out on large submissions. Switched to this and haven't looked back."
"The web scan found a Chegg solution I didn't know existed. Student had copied it almost line for line. Would've missed it completely otherwise."
"Makes the awkward conversations easier. I can just show them the report instead of arguing about it."
"Works with Canvas which was the main thing for us. Students submit like normal, I get the reports. Simple."
"Used MOSS for years but it couldn't catch web plagiarism at all. Students figured that out fast."
"Been using it 2 years now. Solid. Does what it says."
"Love that I can exclude my starter code. Used to get tons of false matches because everyone had the same template."
"I'm just a TA but this makes my life so much easier. The side by side view is really clear."
"Found a ring of 6 students sharing code. The clustering thing made it obvious immediately."
"Support actually responds. Had an issue, they fixed it same day. Refreshing honestly."
"MOSS was free but the hassle wasn't worth it. This just works without the email back and forth."
"The AI detection helped us catch a few ChatGPT submissions early in the semester. Good heads up."
"Tried it and immeditely caught members of the class copying one shared solution but modified slightly"
"The reports are way better than MOSS. Actually looks professional when you have to show admin."
Start detecting plagiarism in under 5 minutes
Upload
Drag and drop your submissions. ZIP files, folders, or use our API. We auto-detect 60+ languages.
Configure
Choose your detection engines: peer matching, web scan, AI detection—or enable all three for complete coverage.
Analyze
Our engines process your submissions in parallel. AST tokenization, web crawling, and AI analysis—all in minutes.
Review
Get actionable reports with side-by-side diffs, source URLs, and similarity scores. Export evidence with one click.
Supports 60+ programming languages
From intro Python courses to advanced systems programming, we've got you covered with language-specific tokenization.
Ready to protect academic integrity?
Join 500+ institutions using the world's most advanced code plagiarism detection platform. Plans from $10,999/month.
Plans starting at $10,999/month • Enterprise pricing for institutions