Qlty CLI
The free Qlty CLI is a polyglot, Rust-based command-line tool for universal linting, auto-formatting, security scanning, code smells, duplication, and maintainability metrics. It runs 70+ static analysis tools across 40+ languages natively (no Docker), is configured via a .qlty/qlty.toml file, and is free for all use including commercial projects. The CLI is a local developer tool, not an HTTP API; key commands include qlty init, qlty check, qlty fmt, qlty smells, qlty metrics, and qlty coverage publish.