Credo review
A focused, free Elixir linter for style, complexity, refactoring, and custom checks.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Credo is an open-source static code analysis tool for Elixir projects. It is aimed at developers and teams that want consistent style, maintainable code, and earlier feedback on common mistakes. Its checks cover naming, coding style, refactoring opportunities, complex code fragments, and other patterns that can make Elixir code harder to maintain. Developers install Credo as a Mix dependency and run it from the command line, making it a focused fit for Elixir codebases rather than a general-purpose linter across several languages.
The feature set goes beyond basic style warnings. Credo includes strict analysis mode, explanations for issues with configuration guidance, and output in JSON and SARIF formats. Custom checks and plugins allow teams to extend its analysis for project-specific conventions. These capabilities make Credo suitable for teams that want to tune linting rules or connect findings with development and CI workflows. Its free, open-source model also makes it practical when teams want static analysis without a paid tier structure.
Credo fits well into an Elixir-centered toolchain through Mix and integrations for IntelliJ Elixir, Atom, Visual Studio Code, Emacs Flycheck, Kakoune, and Neovim. The result is a narrow but coherent product: strong coverage for Elixir style, complexity, refactoring, and maintainability concerns, with support for both editors and automated workflows. Choose Credo when Elixir is the main language and configurable analysis matters. Teams maintaining several programming languages, or looking for one linter across a mixed-language portfolio, should pair it with or consider a broader tool.
Credo pros and cons
- Where it wins
- Covers mistakes, style, refactoring, and complexity findings
- Supports strict mode, explanations, JSON, and SARIF output
- Offers custom checks, plugins, and broad editor integrations
- Where it doesn't
- Supports Elixir rather than multiple programming languages
- Installation and use center on Mix and the command line
- Teams may need another tool for broader language coverage
Credo fact sheet, pricing and score →
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