Catch code plagiarism before it becomes a problem

You suspect two students shared code, but proving it takes hours of side-by-side reading. CodeGrade's plagiarism detection does that for you. It scans every submission in the class and flags matches with a percentage similarity score.

Click into any match and you get a side-by-side code comparison showing exactly which lines overlap. No guessing, no manual diffing.

• Percentage similarity score for every flagged pair
• Side-by-side code comparison with matched lines highlighted
• Export any report to Word or PDF for academic integrity proceedings

Students don't just copy from classmates. They copy from last semester's students, from GitHub, from solutions posted online. CodeGrade catches that too.

Link a previous CodeGrade course to compare against last semester's submissions. Upload external source files to check against public solutions. Set your similarity threshold so you only see what matters.

• Compare within the class, across semesters, and against uploaded external sources
• Link previous CodeGrade courses for automatic cross-semester detection
• Set custom similarity thresholds to control what gets flagged

Plagiarism detection works across all the major programming languages your courses use, plus quiz submissions.

Whether you're teaching intro Python or advanced Java, the detection engine understands the structure of the code, not just string matching. It catches renamed variables, reordered functions, and other common obfuscation techniques.

• Python, Java, JavaScript, C, C++, C#, PHP, R, Scala
• Quiz submissions are also scanned
• Free for courses up to 50 students. No trial, no expiration.