Check student assignments for plagiarism and AI-generated code in one place. Compare source code across 65+ programming languages against GitHub, Stack Overflow and the open web to uncover copied work and review plagiarism matches.
IIT Madras
University of Melbourne
University of Virginia
IISc Bangalore
BITS Pilani
KTH Stockholm
IIT Madras
University of Melbourne
University of Virginia
IISc Bangalore
BITS Pilani
KTH Stockholm
Out of 188 checked. Another 52 matched a classmate's work. The latest three:
submission.h
94%
submission.js
100%
submission.h
98%
Student names, comments and strings are removed before anything is shown here.
Run every assignment through the same check, against the web, past students and each other.
Check your class free 2-day free trialRun a single check and get the same report, with no account or subscription.
Run one check Pay onceCodequiry inspects each line of submitted code and surfaces exact matches across the open web, public repositories, AI-generated output, and prior peer submissions, in seconds.
Every submission is checked against the open web, public repositories, every past student submission, and AI models, with the exact matched lines shown side by side.
Upload the submissions, run the checks, read the evidence. Codequiry helps educators confirm that students are learning the material, not copying it.
Specify the programming language, drag and drop submissions, and run different types of tests: peer, database, or web check.
Learn about our tests
See realtime checking progress and get results instantly. Codequiry's average time from starting checks to results is 12 seconds.
Learn about results
View cluster graphs, match tables, and histograms. Inspect individual submissions with highlighted matches and side-by-side comparisons.
Get Started FreeCodequiry's plagiarism engine runs against both internal and external sources to detect all forms of unoriginal code, built with the advanced requirements for detecting source code similarity.
The most comprehensive test for checking similarity within a group of submissions. Compares unique fingerprints, detecting logical similarities and code collusion.
Compares code to over 100 million sources from GitHub, GitLab, Stack Overflow, and code instances on the web.
Zeus builds on Hexagram, our original engine developed in-house from scratch, with an advanced implementation optimized for speed.
Zeus builds on Hexagram with an implementation optimized for faster analysis. Runtime depends on the submissions and checks selected.
Every programming language, instantly, no configuration needed
Python from Java? JavaScript from C++? We catch it.
Renamed variables? Shuffled functions? Still caught.
Detects restructured algorithms others miss
Industry-lowest. Flag real cheaters, not innocent students.
Each engine has a clear role in your report.
Our original code-similarity engine, developed from scratch.
An advanced implementation built on Hexagram, optimized for speed.
Our independent winnowing-based engine, extended for commercial use.
See our published comparison for specific examples and results. Performance varies with the workload.
Four specialized engines run in parallel on every submission. Together they catch what no single tool can.
Compares all submissions using AST-level tokenization. Catches renamed variables and reordered functions.
Checks against GitHub, Stack Overflow, Chegg, and billions of indexed sources with direct URL tracking.
Identifies patterns from ChatGPT, Claude, Copilot. Updated weekly as AI models evolve.
Synthesizes findings, scores risk, presents clear evidence. You make the final call.
Everything you need to protect academic integrity in a coding course. Purpose-built for computer science education, not a text plagiarism tool with code features bolted on.
Line-by-line diff viewer with syntax highlighting, similarity scoring, and one-click navigation between matched sections.
Interactive 2D diagrams revealing collaboration patterns at a glance.
Identifies ChatGPT, Copilot patterns. Updated weekly.
Process 500 submissions in under 10 minutes. No waiting.
Direct links to where the code was found. Complete transparency.
Powerful REST API for custom integrations. Build your own workflows and automate code checking at scale.
Extremely detailed reports let you investigate any suspicious cases of code plagiarism.
Comprehensive scanning across web, repositories, and code sources.
Precise algorithms calculate scores with industry-leading accuracy.
See clusters of similar submissions, spot patterns instantly.
Side-by-side comparison with syntax highlighting.
Visual breakdown showing percentage distribution of sources.
Automatically recognizes starter code to eliminate false positives.
Direct links to GitHub, Stack Overflow where code was found.
AI-powered originality score for informed decisions.
Trusted by 500+ institutions worldwide
"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. This technology is essential for maintaining rigorous standards in computer science education."
"The rise of AI-generated code has made verifying student mastery a critical challenge. Codequiry is now essential for upholding our academic standards and ensuring every submission represents original effort."
"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 found a 99% match between a student and a Chegg solution. I can't believe CS departments are missing this."
"Used MOSS for years but it couldn't catch web plagiarism at all. Students figured that out fast."
"Love that I can exclude my starter code. Used to get tons of false matches because everyone had the same template."
"Been using it 2 years now. Solid. Does what it says."
From Python to COBOL, Codequiry understands them all. Just upload and go.
Hexagram is our in-house MOSS alternative, built from scratch. Zeus builds on Hexagram for faster analysis. Our independent winnowing engine adds another comparison method alongside web matching and AI detection.
Hexagram™ and Zeus™ are Codequiry engines. Our winnowing implementation is independent of Stanford MOSS.
How Codequiry works as a code plagiarism checker, a programming plagiarism checker for 65+ languages, and an AI code detector, plus how it compares to MOSS.
Codequiry is a purpose-built code plagiarism checker for source code, not repurposed text-matching software. It compares every submission against your peer group and web sources (including GitHub and Stack Overflow), understands code structure across 65+ programming languages, and combines our in-house Hexagram and Zeus engines with independent winnowing-based comparison in a single evidence-rich report.
Yes. Codequiry is a programming plagiarism checker that supports 65+ programming languages, including Python, Java, C++, JavaScript, C#, Go, and Rust, with no configuration. It detects copied and refactored code even after variable renaming, reordering, or comment changes, comparing submissions to one another and to billions of public repositories.
Yes. Codequiry pairs its source code plagiarism checker with a built-in AI code detector that flags code generated by ChatGPT, GitHub Copilot, Claude, and Gemini across 65+ languages. One report covers both copied code and AI-written code, so you can catch academic integrity issues that text-only and MOSS-style tools miss entirely.
Yes. Codequiry is a modern MOSS alternative powered by our independently developed Hexagram and Zeus engines, with web-wide source matching across web sources (including GitHub and Stack Overflow), AI-written code detection, and support for 65+ programming languages, capabilities MOSS does not offer on its own.
Codequiry combines Hexagram, our original engine built in-house from scratch, with Zeus, an advanced version optimized for speed, and our independent winnowing-based similarity engine. These are separate from Stanford MOSS.
No. MOSS only measures similarity between the files you submit and has no AI detection. Codequiry includes a dedicated AI code detector that flags code generated by ChatGPT, Claude, and GitHub Copilot.
No. Hexagram is Codequiry's own engine, built from scratch. Zeus builds on Hexagram for faster analysis. MOSS Commercial is our independently developed winnowing-based engine, separate from Stanford MOSS software and services.
Codequiry supports 65+ programming languages including Python, Java, C++, JavaScript, Go, and Rust with no configuration, while MOSS supports about 24 languages.
Hexagram is our in-house MOSS alternative, built from scratch for structural code comparison. Zeus builds on Hexagram for faster analysis. Our published comparison shows results on specific examples; scores depend on the assignment and changes made to the code.
The most effective source code plagiarism detection. Trusted by 500+ institutions worldwide.
Plans from $28 · Enterprise pricing available
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