Detect plagiarized and similar code across trillions of code sources on the web See what's new

Code Intelligence Hub

Expert insights on AI code detection and academic integrity

Latest Articles

Stay ahead with expert analysis and practical guides

How to Build a Source Code Similarity Pipeline for Detection Tutorials 12 min
Alex Petrov Alex Petrov · 2 months ago

How to Build a Source Code Similarity Pipeline for Detection

A step-by-step guide to building a source code similarity detection pipeline from scratch. Covers tokenization, AST comparison, Winnowing fingerprinting, and heuristic scoring. Includes working Python code and configuration strategies used by universities and enterprises.

What 4,300 JavaScript Projects Reveal About Code Copying Case Studies 10 min
James Okafor James Okafor · 2 months ago

What 4,300 JavaScript Projects Reveal About Code Copying

A large-scale study of 4,300 open source JavaScript repositories reveals the true nature of code copying in modern software development. The findings challenge assumptions about originality, attribution, and the tools we use to detect plagiarism.

Teaching Students to Write Attribution Comments in Group Work Academic Integrity 10 min
David Kim David Kim · 2 months ago

Teaching Students to Write Attribution Comments in Group Work

Attribution comments are a simple but powerful tool for teaching code integrity in collaborative programming projects. This article explains how to implement them effectively, what to include, and how they transform group work from a plagiarism minefield into a learning opportunity.

From Paper Traces to Abstract Syntax Trees: Code Similarity Then and Now General 9 min
Rachel Foster Rachel Foster · 3 months ago

From Paper Traces to Abstract Syntax Trees: Code Similarity Then and Now

The history of code similarity detection is a story of escalating arms races. What started with professors reading printouts has evolved through Unix diffs, token-based fingerprinting, and into modern abstract syntax tree analysis. This retrospective traces the key technical shifts that shaped how we detect code plagiarism in programming courses today.

Do AST-Based Engines Catch More Refactored Cheating Than Token-Based Ones General 10 min
Dr. Sarah Chen Dr. Sarah Chen · 3 months ago

Do AST-Based Engines Catch More Refactored Cheating Than Token-Based Ones

A mid-sized university CS department ran a controlled study comparing AST-based and token-based plagiarism detection across student assignments that had been systematically refactored. The results reveal which technique handles control flow restructuring, identifier renaming, and method reordering — and where both fail entirely.

How a TA Spots Refactored Code in 300 Java Submissions General 13 min
Priya Sharma Priya Sharma · 3 months ago

How a TA Spots Refactored Code in 300 Java Submissions

Teaching assistants often face the challenge of detecting code plagiarism when students refactor submissions to evade similarity checkers. This article profiles one TA's workflow using AST-based analysis and structural fingerprinting to catch plagiarized code in a large introductory Java course, with practical techniques applicable to any programming educator.

A Checklist for Evaluating AI Code Detection Tools AI Detection 9 min
Emily Watson Emily Watson · 3 months ago

A Checklist for Evaluating AI Code Detection Tools

Not all AI detection tools are created equal, and a single "accuracy" number is dangerously misleading. This article provides a practical, seven-point checklist for evaluating AI-generated code detectors, covering everything from cross-language support and prompt sensitivity to campus-specific deployment constraints.

Why More CS Departments Are Adopting Layered Detection General 10 min
Rachel Foster Rachel Foster · 3 months ago

Why More CS Departments Are Adopting Layered Detection

Computer science departments are discovering that no single detection method catches every kind of code plagiarism. This article explores the layered detection approach combining structural, web-source, and AI analysis to create a comprehensive academic integrity system.

When Is Peer Similarity Enough in a Plagiarism Checker General 13 min
James Okafor James Okafor · 3 months ago

When Is Peer Similarity Enough in a Plagiarism Checker

Source code plagiarism detection relies on two fundamentally different reference sets: peer submissions and the open web. This article examines the trade-offs between each approach, when one method catches cheating the other misses, and how to build detection strategies that combine both for maximum coverage.

Can Dev Teams Trust Code Similarity for IP Theft Detection General 8 min
James Okafor James Okafor · 3 months ago

Can Dev Teams Trust Code Similarity for IP Theft Detection

Code similarity analysis has long been a staple of academic integrity enforcement, but enterprises face a harder problem: detecting IP theft, insider leaks, and unlicensed reuse in complex, multi-repo codebases. This post examines the practical limitations and proper applications of similarity detection for proprietary software, from AST comparison to dependency graph analysis.

A Checklist for Integrating Code Scanning Into Your CI Pipeline Tutorials 11 min
Priya Sharma Priya Sharma · 3 months ago

A Checklist for Integrating Code Scanning Into Your CI Pipeline

Manual code review alone can't catch every bug or security vulnerability. This practical guide walks you through building a robust code scanning pipeline that integrates directly into your CI/CD workflow, covering static analysis, dependency scanning, secret detection, and policy enforcement with concrete tool configurations and real-world examples.

Your Static Analysis Tool Is Lying to You About Code Smells General 6 min
James Okafor James Okafor · 3 months ago

Your Static Analysis Tool Is Lying to You About Code Smells

The industry's obsession with counting "code smells" is a dangerous distraction. We're measuring the wrong things, creating false confidence, and missing the systemic rot that actually slows down development. It's time to stop trusting the simplistic metrics and start analyzing what really matters: semantic duplication and logical debt.