Slopo

Slopo is an open source command line tool that detects code duplication where the copies are not exact. It uses embedding models, the same kind of AI used to find texts that are worded differently but mean the same thing, to identify logic that has been implemented more than once in different ways across a codebase. The distance between similar pieces of code raises the score, so duplicates that sit far apart, which are hardest for people and agents to notice, rank highest. The vendor frames it around a common problem in AI assisted development, where an agent writes a fresh implementation of something that already exists elsewhere. Slopo can review similar code in recent Git changes, analyzing them against the whole codebase rather than the changed lines alone, and it can scan an entire repository to support refactoring and maintenance. Dedicated skills let coding agents such as Claude Code and Codex run the tool, interpret the results, set aside duplication that is not actionable and guide a refactor. The vendor also notes that handing an agent a report of similar code can save tokens it would otherwise spend searching. It is aimed at developers and teams using coding agents. The tool is free and open source, available on GitHub. Embedding model API usage is billed by whichever provider is used, and the site publishes no paid plans.