Code Climate Quality vs ESLint

From $16 per user/month (indicative)

Free and open source

Per-seat pricing; free for public repositories.

Free and open source. You pay in engineering time and CI minutes.

Free for open-source repositories.

Everything, self-hosted

Established

Code Climate · since 2011

Category standard

OpenJS Foundation · since 2013

• Maintainability grading is easy to communicate to non-engineers.
• Coverage and quality tracked together in one PR check.
• Free for open source.

• The plugin ecosystem lets you enforce almost any convention as a rule.
• Autofix handles a large share of findings without human effort.
• Universal — every JavaScript tool integrates with it.

• Less depth and fewer languages than SonarQube.
• Letter grades oversimplify and can drive the wrong behaviour.
• Product investment appears to have slowed.

• Configuration is a real project of its own, and the flat-config migration caused significant churn.
• Slow on large codebases without caching.
• Rule sprawl produces bikeshedding unless someone owns the config.

Teams that want a simple maintainability signal in pull requests.

Every JavaScript and TypeScript project.