I built a local MOSS alternative

I built a thing... YAM (Yet Another MOSS) is a free and open-source code plagiarism / similarity detector that runs entirely on your own machine. It combines classic token/winnowing comparison with Abstract Syntax Tree analysis, so it catches more than simple copy-paste: variable renaming, reformatting, reordering, and other cosmetic changes that leave the underlying structure intact.

Key points

• 100% local - student code never leaves your computer (big win for privacy, FERPA, GDPR, etc.)
• Modern, minimalist UI that makes it easy to spot the real problem cases without drowning in noise
• Multiple ways to run it: headless, pure CLI, CLI + browser view, or simple server mode
• Clean CSV and JSON output so you can pipe results into spreadsheets or other tools
• Fully configurable (thresholds, k-gram size, window size, language options, etc.)
• Free and open source (GitLab)
• No accounts, no uploads, no external services. Just install and run.

Repo: https://gitlab.com/sylvan.wood.carving-group/yam

Happy to answer questions or take feedback.