Vale

Vale is a command-line tool that brings code-like linting to prose. It helps teams check documentation and other written content with repeatable rules instead of editor-specific suggestions. It runs on Windows, macOS, and Linux and is written in Go.

Vale understands many markup formats, so prose checks can avoid syntax-related false positives and exclude code snippets from prose-related rules. Its extension system supports standard editorial style guides or custom in-house rule sets, without changing Vale itself.

Vale is distributed as stand-alone binaries, so it does not require installing a language runtime such as Python with pip or Node.js with npm. Development is led by a sole developer and supported through GitHub Sponsors, Open Collective, and hosting credits for Vale Studio.