# Checkstyle vs mypy

**Leader by vioscaleAI score:** mypy

| Attribute | Checkstyle | mypy |
|---|---|---|
| **vioscaleAI score** | 60.1 (49% (low)) | 69.4 (66% (medium)) |
| activity.commits_last_30d | 100 | 100 |
| adoption.dependent_repos | 1,425 | 52,771 |
| adoption.github_stars | 9,599 | 20,682 |
| adoption.package_downloads_weekly | - | 42,892,033 |
| content.faq | `[{"answer":"A development tool that automatically scans Java code to verify adherence to coding standards, detecting style violations, design problems, and formatting issues. Supports customizable rule sets and integrates with build tools and IDEs. It is indexed under Code Quality Tools.","source":"https://checkstyle.org/","question":"What is Checkstyle?","confidence":0.6},{"answer":"Checkstyle supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://checkstyle.org/","question":"What platforms does Checkstyle support?","confidence":0.6},{"answer":"Yes. Checkstyle can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://checkstyle.org/","question":"Can Checkstyle be self-hosted?","confidence":0.6},{"answer":"Yes. Checkstyle is published under the LGPL-2.1 licence, a copyleft licence, so check its terms before embedding it in a closed-source product. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/checkstyle/checkstyle","question":"Is Checkstyle open source?","confidence":0.95}]` | `[{"answer":"A type analysis tool for Python that enables code to transition from pure dynamic typing to statically-typed code through annotations, with error detection at check time. Code runs with negligible performance impact and developers can incrementally adopt static types in existing projects. It is indexed under Code Quality Tools.","source":"https://mypy-lang.org","question":"What is mypy?","confidence":0.6},{"answer":"mypy is open source, so it can be self-hosted and used at no licence cost. Pricing changes often, so verify at source before relying on it.","source":"https://mypy-lang.org","question":"Is mypy free to use?","confidence":0.6},{"answer":"mypy supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://mypy-lang.org","question":"What platforms does mypy support?","confidence":0.6}]` |
| deployment.options | `{"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | Checkstyle analyzes Java source code against configurable rules covering naming, imports, formatting, Javadoc, and class design. It enables teams to maintain consistent coding standards through CLI, IDE plugins, and CI/CD integrations. | A static type checker that analyzes Python code to catch type errors before runtime. Supports gradual typing, allowing you to mix static and dynamic typing and incrementally add type hints to existing codebases. |
| features.capabilities | `{"autofix":false,"metrics":true,"function":"static_analyzer","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"impl_language":"Java","pricing_model":"free","language_scope":"single_language","editor_integration":true}` | `{"autofix":false,"metrics":false,"function":"type_checker","ci_gating":true,"deployment":"cli_local","incremental":true,"open_source":"oss","custom_rules":false,"impl_language":"Python","pricing_model":"free","language_scope":"single_language","editor_integration":true}` |
| integrations.count | 7 | 1 |
| integrations.list | `[{"name":"Maven"},{"name":"Ant"},{"name":"Eclipse","native":true,"category":"ide"},{"name":"IntelliJ IDEA","native":true,"category":"ide"},{"name":"Neovim","native":true,"category":"editor"},{"name":"Code Climate","native":true,"category":"code_quality"},{"name":"GitHub Actions","native":true,"category":"ci"},{"name":"Apache Ant","native":true,"category":"build_tool"}]` | `[{"name":"VS Code","native":true}]` |
| language.primary | Java | Python |
| license.spdx | LGPL-2.1 | - |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://checkstyle.org/","retrievedAt":"2026-10-14T22:30:54.455Z"}` | `{"type":"open_source","sourceUrl":"https://mypy-lang.org","retrievedAt":"2026-08-14T13:45:01.127Z"}` |
| pricing.free_tier | yes | - |
| pricing.model | open_source | open_source |
| pricing.price_level | free | free |
| pricing.transparent | yes | - |
| release.cadence_days | 13 | - |
| release.history | `[{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-14.3.0","date":"2026-09-27T15:22:48Z","type":"stable","version":"checkstyle-14.3.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-14.2.0","date":"2026-09-27T14:43:29Z","type":"stable","version":"checkstyle-14.2.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-14.1.0","date":"2026-08-30T14:47:48Z","type":"stable","version":"checkstyle-14.1.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-14.0.0","date":"2026-08-18T13:09:20Z","type":"stable","version":"checkstyle-14.0.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.11.0","date":"2026-08-16T21:52:20Z","type":"stable","version":"checkstyle-13.11.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.10.0","date":"2026-08-09T17:48:41Z","type":"stable","version":"checkstyle-13.10.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.9.0","date":"2026-07-27T01:04:59Z","type":"stable","version":"checkstyle-13.9.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.8.0","date":"2026-07-12T02:55:15Z","type":"stable","version":"checkstyle-13.8.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.7.0","date":"2026-06-28T15:13:54Z","type":"stable","version":"checkstyle-13.7.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.6.0","date":"2026-06-15T03:24:52Z","type":"stable","version":"checkstyle-13.6.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.5.0","date":"2026-05-30T20:22:13Z","type":"stable","version":"checkstyle-13.5.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.4.2","date":"2026-05-02T04:07:51Z","type":"stable","version":"checkstyle-13.4.2"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.4.1","date":"2026-04-27T12:43:10Z","type":"stable","version":"checkstyle-13.4.1"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.4.0","date":"2026-03-29T17:41:44Z","type":"stable","version":"checkstyle-13.4.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.3.0","date":"2026-02-28T17:36:40Z","type":"stable","version":"checkstyle-13.3.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.2.0","date":"2026-02-05T20:28:40Z","type":"stable","version":"checkstyle-13.2.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.1.0","date":"2026-01-31T17:26:20Z","type":"stable","version":"checkstyle-13.1.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-13.0.0","date":"2026-01-04T23:48:39Z","type":"stable","version":"checkstyle-13.0.0"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-12.3.1","date":"2025-12-31T15:42:54Z","type":"stable","version":"checkstyle-12.3.1"},{"url":"https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-12.3.0","date":"2025-12-13T15:50:49Z","type":"stable","version":"checkstyle-12.3.0"}]` | - |
| reliability.status_page | yes | - |
| security.scorecard | 7 | 6.8 |
| security.vulnerabilities | `{"count":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.puppycrawl.tools%3Acheckstyle&per_page=100","last_12m":0,"max_severity":"MODERATE"}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=mypy&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Code Quality Tools)

| Capability | Checkstyle | mypy |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Static analyzer | Type checker |
| Language scope | Single-language | Single-language |
| Implementation language | Java | Python |
| **Capability** |  |  |
| Autofix | ✗ | ✗ |
| **Config** |  |  |
| Config model | Config file | - |
| **Extensibility** |  |  |
| Custom rules | ✓ | ✗ |
| **Deployment** |  |  |
| Deployment | CLI-local | CLI-local |
| **Delivery** |  |  |
| Editor integration | ✓ | ✓ |
| CI / VCS gating | ✓ | ✓ |
| **Insight** |  |  |
| Code metrics | ✓ | ✗ |
| **Performance** |  |  |
| Incremental / monorepo aware | - | ✓ |
| **Licensing** |  |  |
| Open-source | OSS | OSS |
| **Commercial** |  |  |
| Pricing model | Free | Free |

*Source: vioscaleAI. Generated 2026-10-16T20:52:02.732Z. "-" = undocumented, not absent.*