Clippy

Visit Website

Introduction

Clippy is a collection of lints to catch common mistakes and improve Rust code, maintained by the Rust project. It is distributed with rustup, so cargo clippy works on any standard toolchain.

Lints are grouped into categories such as correctness, suspicious, style, complexity, perf, pedantic and restriction. Correctness lints are deny-by-default because they almost always indicate bugs. cargo clippy --fix applies machine-applicable suggestions, and lint levels can be set in code, in Cargo.toml or in clippy.toml.

In the quality loop Clippy is the standard Rust lint gate in CI.

The source code is at rust-lang/rust-clippy on GitHub under the MIT or Apache-2.0 licence, with about 13,600 stars; the most recent commit was on 10 November 2026.

Features

1. Hundreds of lints: Correctness, style, complexity, performance and more.
2. Categories: Choose strictness by group.
3. Auto-fix: cargo clippy --fix.
4. Configurable: Lint levels in code or config.
5. Bundled with rustup: No extra install.
6. MSRV awareness: Respects minimum supported Rust version.

Pros

1. Official: Maintained with the Rust toolchain.
2. Free to use: Open source under the MIT or Apache-2.0 licence, so the core tool costs nothing to use.
3. Actively maintained: The repository had commits as recent as 10 November 2026.
4. Community: About 13,600 GitHub stars.

Cons

1. Rust only: Single language.
2. Pedantic noise: Some groups are very strict.
3. Version drift: New lints appear with new toolchains.

Usage and Links (Example)

cargo clippy --all-targets --all-features -- -D warnings

Resources:

• Clippy website
• GitHub repository

Pricing

Clippy is free and open source under the MIT or Apache-2.0 licence.

Recommended for?

1. Every Rust project.
2. Teams that treat warnings as errors in CI.

Conclusion

Clippy is an essential part of the Rust toolchain.

Run it with -D warnings in CI and pin the toolchain.

On CheckOps, Clippy is filed under the Release & CI gates stage. Related tools listed here include cargo-nextest, cargo-llvm-cov, cargo-mutants, cargo-fuzz, proptest and Semgrep. A short trial on a real project, with your own code, data and pipeline, is usually the fastest way to choose between them, because fit matters more than feature lists. Facts here come from the official site, documentation and repository, checked on 11 November 2026.