# ESLint vs Psalm

**Leader by vioscaleAI score:** ESLint

| Attribute | ESLint | Psalm |
|---|---|---|
| **vioscaleAI score** | 76 (78% (high)) | 63.7 (42% (low)) |
| activity.commits_last_30d | 44 | 100 |
| adoption.dependent_repos | 1,569,244 | 15,920 |
| adoption.github_stars | 27,559 | 5,896 |
| adoption.package_downloads_weekly | 158,743,826 | - |
| content.faq | `[{"answer":"An open-source linter and fixer for JavaScript and JSX that runs locally in editors and CI pipelines. It uses AST analysis to catch problems and can automatically fix many issues, with full support for custom rules and extensibility. It is indexed under Code Quality Tools.","source":"https://eslint.org","question":"What is ESLint?","confidence":0.6},{"answer":"ESLint 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://eslint.org","question":"Is ESLint free to use?","confidence":0.6},{"answer":"ESLint supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://eslint.org","question":"What platforms does ESLint support?","confidence":0.6},{"answer":"Yes. ESLint can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://eslint.org","question":"Can ESLint be self-hosted?","confidence":0.6},{"answer":"Yes. ESLint 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/eslint/eslint","question":"Is ESLint open source?","confidence":0.99}]` | `[{"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 | Open-source linter that uses abstract syntax tree analysis to detect JavaScript code issues and apply syntax-aware fixes, with extensive customization through custom rules and parsers. | 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,"function":"linter_formatter","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"impl_language":"JavaScript","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 | 2 | - |
| integrations.list | `[{"name":"eslint-plugin-react"},{"name":"eslint-plugin-unicorn"}]` | - |
| language.primary | JavaScript | PHP |
| license.spdx | MIT | MIT |
| platform.support | `{"cli":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","plans":[{"free":true,"name":"Open Source","features":["Find issues in JavaScript code","Automatically fix problems","Custom parsers","Custom rules","Text editor integration","CI pipeline integration"],"description":"Free open source linter","contactSales":false}],"summary":"Free open source","freeTier":true,"sourceUrl":"https://eslint.org","retrievedAt":"2026-08-05T14:08:29.561Z"}` | `{"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 | open_source | commercial |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | 13 | 1 |
| release.history | `[{"url":"https://github.com/eslint/eslint/releases/tag/v10.12.0","date":"2026-10-02T20:07:11Z","type":"stable","version":"v10.12.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.11.0","date":"2026-09-18T20:13:06Z","type":"stable","version":"v10.11.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.10.0","date":"2026-09-04T14:30:17Z","type":"stable","version":"v10.10.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.9.1","date":"2026-08-24T18:18:59Z","type":"stable","version":"v10.9.1"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.9.0","date":"2026-08-21T13:05:50Z","type":"stable","version":"v10.9.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.8.1","date":"2026-08-07T20:16:24Z","type":"stable","version":"v10.8.1"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.8.0","date":"2026-07-24T20:15:28Z","type":"stable","version":"v10.8.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.7.0","date":"2026-07-10T21:22:56Z","type":"stable","version":"v10.7.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v9.39.5","date":"2026-07-10T20:41:58Z","type":"stable","version":"v9.39.5"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.6.0","date":"2026-06-26T20:09:26Z","type":"stable","version":"v10.6.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.5.0","date":"2026-06-12T17:54:47Z","type":"stable","version":"v10.5.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.4.1","date":"2026-05-29T20:32:39Z","type":"stable","version":"v10.4.1"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.4.0","date":"2026-05-15T14:11:22Z","type":"stable","version":"v10.4.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.3.0","date":"2026-05-01T15:39:48Z","type":"stable","version":"v10.3.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.2.1","date":"2026-04-17T20:17:51Z","type":"stable","version":"v10.2.1"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.2.0","date":"2026-04-03T20:36:28Z","type":"stable","version":"v10.2.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.1.0","date":"2026-03-20T15:31:47Z","type":"stable","version":"v10.1.0"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.0.3","date":"2026-03-06T22:53:26Z","type":"stable","version":"v10.0.3"},{"url":"https://github.com/eslint/eslint/releases/tag/v9.39.4","date":"2026-03-06T21:46:54Z","type":"stable","version":"v9.39.4"},{"url":"https://github.com/eslint/eslint/releases/tag/v10.0.2","date":"2026-02-23T21:43:46Z","type":"stable","version":"v10.0.2"}]` | `[{"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 | 6.6 | 4.7 |
| security.vulnerabilities | `{"count":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=eslint&per_page=100","last_12m":1,"max_severity":"MODERATE"}` | `{"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 | ESLint | Psalm |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Linter + formatter | Static analyzer |
| Language scope | Single-language | Single-language |
| Implementation language | JavaScript | 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 2026-10-16T19:27:22.367Z. "-" = undocumented, not absent.*