Source Code Plagiarism Detection
Detect AI-Written Code
from ChatGPT & Others
Uphold Academic Integrity
in Programming
Scan Billions of Sources
for Plagiarised Code
Enforce Academic Integrity
Policies In Your Course
Code Copying Ends
with Codequiry
Detect code plagiarism across 1T+ sources. Find AI-written code, peer collusion, and more with Zeus™ Hyper—comes with JPlag, Dolos, and MOSS built in.
Trusted Code Integrity Detection
Purpose-built for source code. Advanced detection that understands programming logic, catches AI-generated code, and checks the entire web.
Deep Code Analysis
Understands syntax, logic, and structure. Detects plagiarism even with renamed variables and restructured code.
Trillion+ Web Sources
Checks 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."
Introducing Zeus Hyper
The most advanced code plagiarism detection engine ever built. Powered by breakthrough AI that thinks like a developer—catching what others miss in seconds, not hours.
Universal Intelligence
Understands every programming language instantly—no configuration needed
Cross-Language Magic
Spots when Python code was copied from Java, or JavaScript from C++—impossible for traditional tools
Obfuscation-Proof
Renamed variables? Shuffled functions? Rewritten comments? Still caught.
Logic-Aware
Detects restructured algorithms and reordered code blocks others completely miss
Surgically Precise
Industry-lowest false positive rate—flag real cheaters, not innocent students
Insanely Fast
45 seconds. That's it. What takes MOSS 45 minutes, Zeus does in under a minute.
Speed That'll Blow Your Mind
100 student submissions. Same test. Wildly different results.
While MOSS makes you wait up to 45 minutes (and sometimes crashes), Zeus Hyper returns comprehensive results in under a minute. That's not a typo. Our parallel AI processing analyzes code structure, not just text patterns—which is why we're faster AND more accurate.
Accuracy That Actually Matters
Because flagging innocent students destroys trust. We catch cheaters, not false positives.
Traditional tools compare text. Zeus understands code. It recognizes when logic has been rewritten, variables renamed, or algorithms restructured. Students who think they're clever enough to beat detection? They haven't met Zeus.
*Benchmarked against 100 real student submissions across multiple programming languages.
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 Check
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.
Covering all public source code, no plagiarism gone unnoticed.
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.
Why the top universities switched to Codequiry
Why educators love us
Trusted by educators 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."
"Like many professors, I listed 'plagiarism detection tools' on my syllabus as a deterrent, knowing we had no effective software for modern code cheating. That's no longer the case. Codequiry actually works—detecting AI-generated code and web plagiarism that outdated tools miss. We finally have real enforcement backing our academic integrity policies."
"We were completely unaware until we found a Chegg solution that was a 99% match between a student and a Chegg solution, which it seems the student paid for. I mean, I can't believe all of these computer science departments are missing this. Clearly missing and giving out A's to students who are not deserving of those grades."
"Teaching over 500 students per term, we faced a critical challenge: detecting code copied from ChatGPT and online sources without viable tools. Codequiry enables us to batch-process entire cohorts efficiently, establishing a fair assessment environment where academic integrity is upheld. This technology is essential for maintaining rigorous standards in computer science education, and I'm proud we adopted it early."
"We like that it includes MOSS. But we don't really use it, the Zeus Hyper detection is so much better. MOSS was technically made at our university, it just hasn't been updated to the standards we require."
"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."
"With Codequiry, the uptime and the support alone is something. The updates—everything is always updated and there's always better algorithms, better improvements. It's just something that open source tools cannot compete with. This is why we chose Codequiry."
"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."
It takes a few minutes to verify code integrity...
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 check, 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?
Trusted by educators worldwide worldwide. The world's most advanced code plagiarism detection platform. Plans from $59/month.
Enterprise pricing for institutions