# ast-grep vs mypy

**Leader by vioscaleAI score:** mypy

| Attribute | ast-grep | mypy |
|---|---|---|
| **vioscaleAI score** | 54.8 (35% (low)) | 69.4 (66% (medium)) |
| activity.commits_last_30d | 33 | 100 |
| adoption.dependent_repos | 177 | 52,771 |
| adoption.github_stars | 16,225 | 20,682 |
| adoption.package_downloads_weekly | - | 42,892,033 |
| content.faq | `[{"answer":"A structural code search and rewriting tool that uses AST analysis to locate and modify code patterns across thousands of files, with support for linting and programmatic access via Node.js bindings. It is indexed under Code Quality Tools.","source":"https://ast-grep.github.io","question":"What is ast-grep?","confidence":0.6},{"answer":"ast-grep is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.","source":"https://ast-grep.github.io","question":"Is ast-grep free to use?","confidence":0.6},{"answer":"ast-grep supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://ast-grep.github.io","question":"What platforms does ast-grep support?","confidence":0.6},{"answer":"Yes. ast-grep can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://ast-grep.github.io","question":"Can ast-grep be self-hosted?","confidence":0.6},{"answer":"Yes. ast-grep is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/ast-grep/ast-grep","question":"Is ast-grep 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 | Find and modify code patterns using abstract syntax tree analysis. Useful for linting, refactoring, and enforcing coding standards. | 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":true,"function":"static_analyzer","deployment":"cli_local","open_source":"oss","config_model":"rule_packs","custom_rules":true,"impl_language":"Rust","pricing_model":"free","language_scope":"multi_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 | - | 1 |
| integrations.list | - | `[{"name":"VS Code","native":true}]` |
| language.primary | Rust | Python |
| license.spdx | MIT | - |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","sourceUrl":"https://ast-grep.github.io","retrievedAt":"2026-10-13T13:48:30.935Z"}` | `{"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 |
| release.cadence_days | 15 | - |
| release.history | `[{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.50.0","date":"2026-10-09T14:19:44Z","type":"stable","version":"0.50.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.45.3","date":"2026-08-31T01:42:23Z","type":"stable","version":"0.45.3"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.45.2","date":"2026-08-23T19:48:48Z","type":"stable","version":"0.45.2"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.45.1","date":"2026-08-07T15:13:34Z","type":"stable","version":"0.45.1"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.45.0","date":"2026-07-23T16:07:00Z","type":"stable","version":"0.45.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.44.1","date":"2026-07-04T14:06:40Z","type":"stable","version":"0.44.1"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.44.0","date":"2026-06-22T01:49:47Z","type":"stable","version":"0.44.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.43.0","date":"2026-05-25T17:54:30Z","type":"stable","version":"0.43.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.42.3","date":"2026-05-19T15:18:18Z","type":"stable","version":"0.42.3"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.42.2","date":"2026-05-10T21:58:34Z","type":"stable","version":"0.42.2"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.42.1","date":"2026-04-04T16:01:20Z","type":"stable","version":"0.42.1"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.42.0","date":"2026-03-16T03:29:14Z","type":"stable","version":"0.42.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.41.1","date":"2026-03-10T14:04:27Z","type":"stable","version":"0.41.1"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.41.0","date":"2026-02-22T18:57:13Z","type":"stable","version":"0.41.0"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.5","date":"2026-01-10T17:57:43Z","type":"stable","version":"0.40.5"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.4","date":"2026-01-05T01:22:05Z","type":"stable","version":"0.40.4"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.3","date":"2025-12-15T15:38:42Z","type":"stable","version":"0.40.3"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.2","date":"2025-12-14T22:38:05Z","type":"stable","version":"0.40.2"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.1","date":"2025-12-11T05:41:28Z","type":"stable","version":"0.40.1"},{"url":"https://github.com/ast-grep/ast-grep/releases/tag/0.40.0","date":"2025-11-16T04:57:10Z","type":"stable","version":"0.40.0"}]` | - |
| security.scorecard | - | 6.8 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40ast-grep%2Fnapi&per_page=100","last_12m":0,"max_severity":null}` | `{"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 | ast-grep | mypy |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Static analyzer | Type checker |
| Language scope | Multi-language | Single-language |
| Implementation language | Rust | Python |
| **Capability** |  |  |
| Autofix | ✓ | ✗ |
| **Config** |  |  |
| Config model | Rule packs | - |
| **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 2026-10-16T20:59:28.656Z. "-" = undocumented, not absent.*