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SwiftLint

SwiftLint is an MIT tool from Realm for enforcing Swift style and conventions, with over 200 rules, auto-correct and Xcode, SwiftPM and CI integration.

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Introduction

SwiftLint enforces Swift style and conventions, loosely based on community style guides. It hooks into Clang and SourceKit to understand Swift’s syntax tree.

It ships a large set of rules, some opt-in, covering naming, spacing, force unwrapping, complexity and more. swiftlint --fix corrects many violations. Configuration in .swiftlint.yml selects rules and paths, custom regex rules handle team conventions, and integrations cover Xcode build phases, Swift Package Manager plugins and CI reporters.

In the quality loop it is the first gate for iOS and macOS Swift code.

The source code is at realm/SwiftLint on GitHub under the MIT licence, with about 19,800 stars; the most recent commit was on 5 November 2026.

Features

  1. Rule library: Default and opt-in rules.
  2. Auto-correct: --fix for many rules.
  3. Custom rules: Regex-based team rules.
  4. Xcode integration: Build phase warnings.
  5. SwiftPM plugins: Build tool and command plugins.
  6. Reporters: JSON, checkstyle, SARIF and more.

Pros

  1. Widely adopted: Standard in iOS projects.
  2. Free to use: Open source under the MIT licence, so the core tool costs nothing to use.
  3. Actively maintained: The repository had commits as recent as 5 November 2026.
  4. Community: About 19,800 GitHub stars.

Cons

  1. Swift only: No Objective-C.
  2. Build-time cost: Large projects add seconds per build.
  3. Rule churn: Rules change between versions.
brew install swiftlint
swiftlint lint --strict
swiftlint --fix

Resources:

Pricing

SwiftLint is free and open source under the MIT licence.

  1. iOS and macOS teams.
  2. Swift package maintainers.

Conclusion

SwiftLint is the default linter for Swift codebases.

Pin its version so builds stay reproducible.

On CheckOps, SwiftLint is filed under the Release & CI gates stage. Related tools listed here include Swift Testing, XCTest, XCUITest, MegaLinter, SonarQube and pre-commit. When comparing them, weigh the licence, the languages and platforms each supports, whether it is self-hosted or managed, and how cleanly it slots into your existing CI pipeline. Details on this page were checked against the official website, documentation and repository on 11 November 2026.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with SwiftLint side by side.