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Scalafmt

Scalafmt is a free, open-source formatter that helps teams apply consistent formatting to Scala code.

Place
#24 of 34
Score
6.0
Scalafmt's website

What Scalafmt is

Scalafmt is a free, open-source formatter that helps teams apply consistent formatting to Scala code. It formats Scala 2, Scala 3, sbt files, and Scala scripts, with one selected dialect for each file. Rules are configured in a plain text `.scalafmt.conf` file using HOCON syntax. Since version 3.1.0, the configuration must explicitly specify the Scalafmt version and `runner.dialect`.

Scalafmt can run from an editor, a build tool, or a terminal. Documented editor integrations include IntelliJ, VS Code, Vim, NeoVim, Emacs, Sublime Text, and Eclipse; Metals supports editor formatting requests. It integrates with sbt and documents integrations for Maven, Gradle, and Mill. Command-line check and test modes report misformatted code without changing files. Other listed capabilities include ignoring files, formatting changed lines, and a library API. IntelliJ range formatting uses IntelliJ’s own formatter by default because Scalafmt is designed mainly for whole files and selected ranges may produce undesirable results. The project identifies its license as Apache-2.0.

Good

  • Supports Scala 2, Scala 3, and sbt dialects
  • Runs from editors, build tools, or terminal
  • Check and test modes avoid writing changes
  • Offers editor and build-tool integrations
  • Apache-2.0 license

Watch out

  • Configuration must specify version and runner.dialect
  • IntelliJ range formatting defaults to IntelliJ’s formatter
  • Selected-range formatting may produce undesirable results

Who it suits

Scalafmt suits Scala developers and teams seeking consistent formatting through editors, build tools, or the command line. It is also relevant for projects using sbt files or Scala scripts.

Verdict

Scalafmt provides broad Scala formatting support and several ways to fit it into development workflows. Teams should account for its explicit configuration requirements and IntelliJ’s range-formatting behavior.

Plans and prices

From Scalafmt's own pricing page, checked 7 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFreeCode formatter for Scala

The facts

Each one read from Scalafmt's own pages, with the date it was checked.

What it does

Build integrations
Scalafmt integrates with sbt and has documented integrations for Maven, Gradle, and Mill.checked 7 Oct 2026
Configuration
Formatting options are set in a plain text .scalafmt.conf file using HOCON syntax.checked 7 Oct 2026
Editor integrations
The documentation describes use with IntelliJ, VS Code, Vim, NeoVim, Emacs, Sublime Text, and Eclipse, with Metals supporting formatting requests from editors.checked 7 Oct 2026
File support
Scalafmt can format Scala files as well as .sbt and .sc files.checked 7 Oct 2026
Formatting checks
The CLI offers check and test modes that report misformatted code without writing changes.checked 7 Oct 2026
How to run it
Scalafmt can run from an editor, build tool, or terminal.checked 7 Oct 2026
IntelliJ limitation
IntelliJ range formatting uses its own formatter by default because Scalafmt is primarily designed to format entire text files and selected ranges may produce undesirable results.checked 7 Oct 2026
License
The GitHub repository identifies the project license as Apache-2.0.checked 7 Oct 2026
Purpose
Scalafmt is a code formatter for Scala that formats code consistently across a team.checked 7 Oct 2026
Scala dialects
The formatter supports Scala 2, Scala 3, and sbt-specific dialects, with one dialect selected for each file.checked 7 Oct 2026
Security
The official Scalafmt pages opened for this research do not state security certifications or compliance claims.checked 7 Oct 2026
Support
The project site links to a community Discord and GitHub, and the CLI help directs bug reports to GitHub issues.checked 7 Oct 2026
Version requirement
Since version 3.1.0, the version and runner.dialect settings must be specified explicitly in configuration.checked 7 Oct 2026

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