custom_lint

Free#8 of 20 in Dart Flutter Static Analysis Tools

custom_lint: A free, open-source toolkit for authoring and testing custom Dart lints, but no longer actively developed. Ranked #8 of 20 in Dart Flutter Static Analysis Tools by our editors (7.3/10); pricing: Free plan; best for teams building and testing custom Dart lint rules.

7.3/10Editor score

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At a glance

Editor score
7.3 / 10
Pricing
Free plan
Best for
Teams building and testing custom Dart lint rules
Free plan
Yes
Paid from
Free
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.

Your product? Our editors can test custom_lint in depth and publish a review, labelled as paid · from $149/mo →

custom_lint pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on pub.dev

custom_lint fact sheet

Free plan	Yes
Paid from	Free
Dart analysis	Yes
Flutter analysis	Yes
Deployment	Self-hosted
IDE support	Multiple
Security analysis	No
CI integration	Yes
Deployment	Self-hosted
Platforms	Windows, macOS, Linux
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations	1 integrations: Visual Studio Code
Pricing	Free plan
Website	pub.dev
Facts checked	26 Sep 2026

custom_lint integrations

custom_lint lists 1 integrations on its own site.

Visual Studio Code

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custom_lint vs the competition

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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 Oct 2026

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Last updated 7 Oct 2026 · How we research and update