Fallow vs Simian Similarity Analyzer

Fallow has no write-up on Specifiction yet; its figures are above.

Simian Similarity Analyzer scans files in a repository and reports repeated blocks of text, including duplicated code. It analyzes human-readable material such as source files, markup, stylesheets, Markdown, and plain text. Listed languages range from Java, C, C++, C#, COBOL, and Python to JavaScript, TypeScript, HTML, XML, and CSS. The tool runs on the Java Virtual Machine, and its generated JAR works with JDK 8 or newer. It can run locally, from scripts, or in a build pipeline; the repository also documents Gradle integration. Results are plain text by default, with XML, YAML, and editor-friendly formats available. Settings include a duplicate-line threshold, file include and exclude patterns, language selection, and ways to ignore differences such as identifiers, strings, and numbers. The maker reports a JDK test processing over 2.4 million lines and finding more than 140,000 duplicate lines in under five seconds, with results varying by hardware, operating system, and options. Simian is free and open source under Apache License 2.0.