# mypy vs Psalm

**Leader by Vioscale score:** Psalm

| Attribute | mypy | Psalm |
|---|---|---|
| **Vioscale score** | 80.4 (22% (low)) | 81.4 (14% (low)) |
| activity.commits_last_30d | 44 | - |
| adoption.github_stars | 20,558 | 5,875 |
| adoption.package_downloads_weekly | 48,604,416 | - |
| deployment.options | - | `{"self_hosted":true}` |
| description.long | Mypy is an optional static type checker for Python that combines the benefits of dynamic and static typing. It enables compile-time type checking with no runtime overhead while allowing gradual migration from dynamic to static typing. | A free and open-source static analysis tool for PHP that identifies type-related bugs and security vulnerabilities in code, with automatic fixing capabilities. |
| features.capabilities | `{"function":"type_checker","deployment":"cli_local","open_source":"oss","pricing_model":"free","language_scope":"single_language"}` | `{"autofix":true,"function":"static_analyzer","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"pricing_model":"free","language_scope":"single_language","editor_integration":true}` |
| language.primary | Python | PHP |
| license.spdx | - | MIT |
| platform.support | - | `{"cli":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://mypy-lang.org","retrievedAt":"2026-08-05T14:11:24.368Z"}` | `{"type":"open_source","plans":[{"free":true,"name":"Open Source","description":"Free and open-source static analysis tool for PHP","contactSales":false}],"summary":"Free and open-source. Optional paid support contracts available.","freeTier":true,"sourceUrl":"https://psalm.dev/","retrievedAt":"2026-08-03T22:32:46.041Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | open_source | commercial |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | - | 1 |

## Capabilities (Code Quality Tools)

| Capability | mypy | Psalm |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Type checker | Static analyzer |
| Language scope | Single-language | Single-language |
| Implementation language | - | - |
| **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: Vioscale. Generated 2026-08-07T00:06:22.151Z. "-" = undocumented, not absent.*