# Black vs Psalm

**Leader by vioscaleAI score:** Black

| Attribute | Black | Psalm |
|---|---|---|
| **vioscaleAI score** | 73.9 (77% (high)) | 63.7 (42% (low)) |
| activity.commits_last_30d | 75 | 100 |
| adoption.dependent_repos | 105,588 | 15,920 |
| adoption.github_stars | 41,918 | 5,896 |
| adoption.package_downloads_weekly | 27,633,532 | - |
| content.faq | `[{"answer":"An opinionated Python code formatter that automatically reformats code according to a standardized style. It produces minimal diffs for cleaner code review and reduces developer cognitive load by removing formatting decisions, allowing focus on code logic. It is indexed under Code Quality Tools.","source":"https://black.readthedocs.io/en/stable/","question":"What is Black?","confidence":0.6},{"answer":"Black 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://black.readthedocs.io/en/stable/","question":"Is Black free to use?","confidence":0.6},{"answer":"Black supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://black.readthedocs.io/en/stable/","question":"What platforms does Black support?","confidence":0.6},{"answer":"Yes. Black can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://black.readthedocs.io/en/stable/","question":"Can Black be self-hosted?","confidence":0.6},{"answer":"We have confirmed 8 integrations for Black, including Neovim, conform.nvim, ALE, SublimeText, Pre-commit, Jupyter Notebooks, blacken-docs and blackdoc. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://black.readthedocs.io/en/stable/","question":"What does Black integrate with?","confidence":0.6},{"answer":"Yes. Black 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/psf/black","question":"Is Black open source?","confidence":0.95}]` | `[{"answer":"Psalm is a free, open-source static analyzer for PHP that identifies type-related errors and bugs in codebases at their strictest settings. It can automatically fix many common issues and supports safe coding patterns used in other languages. It is indexed under Code Quality Tools.","source":"https://psalm.dev/","question":"What is Psalm?","confidence":0.6},{"answer":"Psalm 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://psalm.dev/","question":"Is Psalm free to use?","confidence":0.6},{"answer":"Psalm supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://psalm.dev/","question":"What platforms does Psalm support?","confidence":0.6},{"answer":"Yes. Psalm can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://psalm.dev/","question":"Can Psalm be self-hosted?","confidence":0.6},{"answer":"Yes. Psalm 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/vimeo/psalm","question":"Is Psalm open source?","confidence":0.95}]` |
| deployment.options | `{"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A Python code formatter that automatically reformats entire files to enforce consistent styling. It produces minimal diffs to accelerate code review and ensures uniform appearance across projects. | Psalm scans PHP codebases to discover potential problems and includes Psalter, a tool for automatically fixing identified issues with configurable safety measures and PHP version targeting. |
| features.capabilities | `{"autofix":true,"metrics":false,"function":"formatter","ci_gating":true,"deployment":"both","incremental":false,"open_source":"oss","config_model":"zero_config","custom_rules":false,"impl_language":"Python","pricing_model":"free","language_scope":"single_language","editor_integration":true}` | `{"autofix":true,"metrics":true,"function":"static_analyzer","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"impl_language":"PHP","pricing_model":"free","language_scope":"single_language","editor_integration":true}` |
| integrations.count | 5 | - |
| integrations.list | `[{"name":"Neovim"},{"name":"conform.nvim"},{"name":"ALE"},{"name":"SublimeText"},{"name":"Pre-commit"},{"name":"Jupyter Notebooks"},{"name":"blacken-docs"},{"name":"blackdoc"},{"name":"Vim","native":true},{"name":"Visual Studio Code","native":true,"category":"editor","direction":"bidirectional"},{"name":"GitHub Actions","native":true,"category":"ci","direction":"inbound"}]` | - |
| language.primary | Python | PHP |
| license.spdx | MIT | MIT |
| platform.support | `{"cli":true,"linux":true,"windows":true}` | `{"cli":true}` |
| pricing | `{"type":"free","summary":"Free and open source","freeTier":true,"sourceUrl":"https://black.readthedocs.io/en/stable/","retrievedAt":"2026-09-14T09:28:09.046Z"}` | `{"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 | yes |
| pricing.model | free | commercial |
| pricing.price_level | free | free |
| pricing.transparent | yes | yes |
| release.cadence_days | 31 | 1 |
| release.history | `[{"url":"https://github.com/psf/black/releases/tag/26.10.1","date":"2026-10-10T04:11:33Z","type":"stable","version":"26.10.1"},{"url":"https://github.com/psf/black/releases/tag/26.10.0","date":"2026-10-04T16:50:23Z","type":"stable","version":"26.10.0"},{"url":"https://github.com/psf/black/releases/tag/26.5.1","date":"2026-05-18T16:52:38Z","type":"stable","version":"26.5.1"},{"url":"https://github.com/psf/black/releases/tag/26.5.0","date":"2026-05-16T17:56:23Z","type":"stable","version":"26.5.0"},{"url":"https://github.com/psf/black/releases/tag/26.3.1","date":"2026-03-12T03:35:15Z","type":"stable","version":"26.3.1"},{"url":"https://github.com/psf/black/releases/tag/26.3.0","date":"2026-03-06T17:41:48Z","type":"stable","version":"26.3.0"},{"url":"https://github.com/psf/black/releases/tag/26.1.0","date":"2026-01-18T04:49:25Z","type":"stable","version":"26.1.0"},{"url":"https://github.com/psf/black/releases/tag/26.1a1","date":"2025-12-08T01:46:21Z","type":"prerelease","version":"26.1a1"},{"url":"https://github.com/psf/black/releases/tag/25.12.0","date":"2025-12-08T01:40:32Z","type":"stable","version":"25.12.0"},{"url":"https://github.com/psf/black/releases/tag/25.11.0","date":"2025-11-10T01:53:31Z","type":"stable","version":"25.11.0"},{"url":"https://github.com/psf/black/releases/tag/25.9.0","date":"2025-09-19T00:27:15Z","type":"stable","version":"25.9.0"},{"url":"https://github.com/psf/black/releases/tag/25.1.0","date":"2025-01-29T04:15:11Z","type":"stable","version":"25.1.0"},{"url":"https://github.com/psf/black/releases/tag/24.10.0","date":"2024-10-07T19:20:06Z","type":"stable","version":"24.10.0"},{"url":"https://github.com/psf/black/releases/tag/24.8.0","date":"2024-08-02T17:42:53Z","type":"stable","version":"24.8.0"},{"url":"https://github.com/psf/black/releases/tag/24.4.2","date":"2024-04-26T00:31:27Z","type":"stable","version":"24.4.2"},{"url":"https://github.com/psf/black/releases/tag/24.4.1","date":"2024-04-24T15:17:30Z","type":"stable","version":"24.4.1"},{"url":"https://github.com/psf/black/releases/tag/24.4.0","date":"2024-04-12T20:13:48Z","type":"stable","version":"24.4.0"},{"url":"https://github.com/psf/black/releases/tag/24.3.0","date":"2024-03-15T19:35:14Z","type":"stable","version":"24.3.0"},{"url":"https://github.com/psf/black/releases/tag/24.2.0","date":"2024-02-12T20:20:40Z","type":"stable","version":"24.2.0"},{"url":"https://github.com/psf/black/releases/tag/24.1.1","date":"2024-01-28T05:28:09Z","type":"stable","version":"24.1.1"}]` | `[{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-rc2","date":"2026-10-09T16:00:46Z","type":"prerelease","version":"7.0.0-rc2"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.20.0","date":"2026-10-09T16:01:25Z","type":"stable","version":"6.20.0"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.19.2","date":"2026-10-07T13:43:48Z","type":"stable","version":"6.19.2"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-rc1","date":"2026-10-05T12:46:32Z","type":"prerelease","version":"7.0.0-rc1"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta24","date":"2026-10-02T13:17:13Z","type":"prerelease","version":"7.0.0-beta24"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta23","date":"2026-10-01T09:39:24Z","type":"prerelease","version":"7.0.0-beta23"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.19.1","date":"2026-09-29T11:11:40Z","type":"stable","version":"6.19.1"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.19.0","date":"2026-09-28T14:00:35Z","type":"stable","version":"6.19.0"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.18.1","date":"2026-09-25T20:34:43Z","type":"stable","version":"6.18.1"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta22","date":"2026-09-21T11:24:43Z","type":"prerelease","version":"7.0.0-beta22"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.18.0","date":"2026-09-21T11:04:09Z","type":"stable","version":"6.18.0"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta21","date":"2026-09-15T12:56:42Z","type":"prerelease","version":"7.0.0-beta21"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.17.2","date":"2026-09-15T12:43:38Z","type":"stable","version":"6.17.2"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta20","date":"2026-09-14T10:19:25Z","type":"prerelease","version":"7.0.0-beta20"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.17.1","date":"2026-09-12T13:52:03Z","type":"stable","version":"6.17.1"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.17.0","date":"2026-09-10T12:43:54Z","type":"stable","version":"6.17.0"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta19","date":"2026-04-15T20:51:53Z","type":"prerelease","version":"7.0.0-beta19"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta18","date":"2026-04-15T18:57:09Z","type":"prerelease","version":"7.0.0-beta18"},{"url":"https://github.com/vimeo/psalm/releases/tag/6.16.1","date":"2026-03-19T11:07:58Z","type":"stable","version":"6.16.1"},{"url":"https://github.com/vimeo/psalm/releases/tag/7.0.0-beta17","date":"2026-03-17T11:28:08Z","type":"prerelease","version":"7.0.0-beta17"}]` |
| security.disclosure_policy | yes | - |
| security.scorecard | 7.5 | 4.7 |
| security.vulnerabilities | `{"count":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=black&per_page=100","last_12m":1,"max_severity":"HIGH"}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=packagist&package_name=vimeo%2Fpsalm&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Code Quality Tools)

| Capability | Black | Psalm |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Formatter | Static analyzer |
| Language scope | Single-language | Single-language |
| Implementation language | Python | PHP |
| **Capability** |  |  |
| Autofix | ✓ | ✓ |
| **Config** |  |  |
| Config model | Zero-config | Config file |
| **Extensibility** |  |  |
| Custom rules | ✗ | ✓ |
| **Deployment** |  |  |
| Deployment | Both | 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 2026-10-25T00:36:13.944Z. "-" = undocumented, not absent.*