ESLint vs Codacy

Free and open source

From $21 per user/month (indicative, Pro)

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

Per-developer pricing rather than lines of code, which suits small teams with large codebases.

Everything, self-hosted

Free for open-source projects and small teams.

Category standard

OpenJS Foundation · since 2013

Established

Codacy · since 2014

• 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.

• Per-developer pricing is cheaper than SonarQube for small teams on big repositories.
• Bundles quality and security scanning in one PR check.
• Very quick to set up — connect a repository and it works.

• 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.

• Wrapping open-source linters means analysis depth depends on those tools.
• Configuration across many languages becomes fiddly.
• Less established than SonarQube in enterprise procurement.

Every JavaScript and TypeScript project.

Small and mid-sized teams wanting quality and security checks in PRs without running a server.