Scalafix

Scalafix is ranked #7 of 22 in code refactoring tools on The Geeks Club. It runs on Linux, macOS, Windows.

Compared on code refactoring tools

Free plan: Yes
Supported languages: Scala 2.12, Scala 2.13, Scala 3
Refactoring scope: project
Batch refactoring: Yes
AST-based analysis: Yes
Deployment: desktop

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Scalafix

Purpose: Scalafix is a refactoring and linting tool for Scala that automates code health tasks and one-time migrations.
Linting: It reports code patterns that can cause production bugs or violate coding style.
CI: Scalafix can enforce refactoring and linting rules during code review.
Rule types: Syntactic rules run on source code without compilation, while semantic rules require compiled sources with the SemanticDB compiler plugin enabled.
Built-in rules: Built-in rules include OrganizeImports, RemoveUnused, DisableSyntax, ProcedureSyntax, and RedundantSyntax.
Custom rules: Developers can write custom linter and rewrite rules using Scalafix’s public API.
Build tools: The documentation describes sbt support and lists externally maintained integrations for scala-cli, Mill, Gradle, Maven, and Mega-Linter.
Mega-Linter limit: The Mega-Linter integration supports only built-in syntactic rules.
Supported operating systems: Scalafix is tested to work on macOS, Linux, and Windows; other setups may work but could behave unexpectedly.
Scala support: The installation guide lists Scala 2.12.21, 2.13.18, and 3.9.0 LTS as tested versions and says Scalafix is no longer published for Scala 2.11.
Semantic rule requirement: Semantic rules require source files compiled with SemanticDB, and some rules also require compiler options such as unused-import warnings.
Support and community: The Scalafix site links to community help on Discord and Scala Users.
Maker: The Scala Center describes itself as an independent not-for-profit center established at EPFL and focused on open source and education.
Refactoring: It can automate day-to-day code health tasks and one-time migration scripts.

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Where it ranks on The Geeks Club

Best Code Refactoring Tools in 2026#7 of 22

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Sources

scalacenter.github.io/scalafix/· checked 2 Oct 2026
scalacenter.github.io/scalafix/docs/rules/overview.html· checked 2 Oct 2026
scalacenter.github.io/scalafix/docs/developers/setup.html· checked 2 Oct 2026
scalacenter.github.io/scalafix/docs/users/installation.html· checked 2 Oct 2026
scala.epfl.ch· checked 2 Oct 2026