# flake8 vs Psalm

| Attribute | flake8 | Psalm |
|---|---|---|
| **vioscaleAI score** | 64 (66% (medium)) | 63.7 (42% (low)) |
| activity.commits_last_30d | 21 | 100 |
| adoption.dependent_repos | 153,063 | 15,920 |
| adoption.github_stars | 3,828 | 5,896 |
| adoption.package_downloads_weekly | 9,519,717 | - |
| content.faq | `[{"answer":"flake8 is an open-source Python linter that combines multiple style-checking tools to verify code compliance with PEP 8 and detect errors. It uses a plugin architecture for extensibility and is commonly integrated into development workflows and CI/CD pipelines. It is indexed under Code Quality Tools.","source":"https://flake8.pycqa.org/","question":"What is flake8?","confidence":0.6},{"answer":"flake8 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://flake8.pycqa.org/","question":"Is flake8 free to use?","confidence":0.6},{"answer":"flake8 supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://flake8.pycqa.org/","question":"What platforms does flake8 support?","confidence":0.6},{"answer":"Yes. flake8 can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://flake8.pycqa.org/","question":"Can flake8 be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for flake8, including pycodestyle, pyflakes and mccabe. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://flake8.pycqa.org/","question":"What does flake8 integrate with?","confidence":0.6},{"answer":"Yes. flake8 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://pypi.org/pypi/flake8/json","question":"Is flake8 open source?","confidence":0.9}]` | `[{"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 | flake8 is an open-source Python linter that combines multiple style-checking tools to verify code compliance with PEP 8 and detect errors. It uses a plugin architecture for extensibility and is commonly integrated into development workflows and CI/CD pipelines. | 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":false,"metrics":true,"function":"linter","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"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 | 3 | - |
| integrations.list | `[{"name":"pycodestyle"},{"name":"pyflakes"},{"name":"mccabe"},{"name":"pre-commit","native":true,"category":"ci","direction":"inbound"}]` | - |
| language.primary | Python | PHP |
| license.spdx | MIT | MIT |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"free","freeTier":true,"sourceUrl":"https://flake8.pycqa.org/","retrievedAt":"2026-09-10T16:03:57.147Z"}` | `{"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 | - | 1 |
| release.history | - | `[{"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.scorecard | 5 | 4.7 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=flake8&per_page=100","last_12m":0,"max_severity":null}` | `{"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 | flake8 | Psalm |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Linter | Static analyzer |
| Language scope | Single-language | Single-language |
| Implementation language | Python | PHP |
| **Capability** |  |  |
| Autofix | ✗ | ✓ |
| **Config** |  |  |
| Config model | Config file | 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 2026-10-16T19:15:56.935Z. "-" = undocumented, not absent.*