custom_lint

At a glance

• Editor score
  Not yet scored
• Pricing
  Free plan
• Best for
  Teams building and testing custom Dart lint rules
• Free plan
  Yes
• Paid from
  None
• Dart analysis
  Yes
• Facts checked
  26 Sep 2026

• Where it wins

  • Build, configure, and selectively enable custom lint rules.
  • Includes CLI analysis, rule tests, quick fixes, and assists.
  • Supports Flutter projects, plugin debugging, and hot reload.

• Where it doesn't

  • No longer under active development; new lints are directed to analysis_server_plugin.
  • Focused on custom rules rather than a broad prebuilt ruleset.
  • Its listed IDE integration is Visual Studio Code.

Our verdict on custom_lint

custom_lint is an open-source Dart package from Invertase for developers and teams that need to create and apply their own lint rules in Dart and Flutter projects. It supports custom rule development through custom_lint_builder, with a command-line runner for analysis and CI. That makes it a fit for package authors or teams with conventions that generic lint collections do not cover, rather than a ready-made, broad ruleset for teams seeking prewritten checks.

Rule authoring comes with practical development tools: lint rules can be tested with expect_lint, plugin behavior can be debugged with the Dart debugger, and lint plugins support hot reload and hot restart. Projects can enable or disable individual rules, set options for rules that expose them, and use // ignore and // ignore_for_file comments. Quick fixes and assists extend the workflow beyond reporting diagnostics. It supports Flutter projects and lists Visual Studio Code among its integrations; the package also provides CLI analysis for CI and is self-hosted.

The main consideration is maintenance status: the repository was archived on March 24, 2026, says the project is no longer under active development, and recommends Dart’s analysis_server_plugin for new custom lints. Buyers starting a new linting project should weigh that recommendation before adopting custom_lint. It is more appropriate for teams that specifically need its custom-rule authoring and testing capabilities and can account for the project’s status; teams looking for an actively developed foundation for new plugins should consider the recommended alternative instead.

custom_lint pricing

custom_lint fact sheet

custom_lint integrations

custom_lint lists 1 integrations on its own site.

• Visual Studio Code

Alternatives to custom_lint

• DADart Analysis ServerA free, local analysis engine for Dart diagnostics and editor language services.—
• CodacyA hosted analysis suite with Dart support, pull-request checks, and a free plan.7.0
• Snyk CodeSecurity-focused source scanning with IDE, pull-request, CLI, and CI/CD coverage.5.0

See all custom_lint alternatives →

custom_lint vs the competition

• CLDAcustom_lint vs Dart Analysis Server
• CLcustom_lint vs Codacy
• CLcustom_lint vs Snyk Code
• CLDCcustom_lint vs Dart Code Metrics
• CLMLcustom_lint vs many_lints
• CLVGcustom_lint vs Very Good Analysis

Compare custom_lint with any tool side by side →

Featured on iTechGuides

custom_lint is listed in our Dart Flutter Static Analysis Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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