# Black vs ESLint

| Attribute | Black | ESLint |
|---|---|---|
| **vioscaleAI score** | 73.9 (77% (high)) | 76 (78% (high)) |
| activity.commits_last_30d | 75 | 44 |
| adoption.dependent_repos | 105,588 | 1,569,244 |
| adoption.github_stars | 41,918 | 27,559 |
| adoption.package_downloads_weekly | 27,633,532 | 158,743,826 |
| 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":"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}]` |
| 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. | 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. |
| 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,"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}` |
| integrations.count | 5 | 2 |
| 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"}]` | `[{"name":"eslint-plugin-react"},{"name":"eslint-plugin-unicorn"}]` |
| language.primary | Python | JavaScript |
| 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","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"}` |
| pricing.free_tier | yes | yes |
| pricing.model | free | open_source |
| pricing.price_level | free | free |
| pricing.transparent | yes | - |
| release.cadence_days | 31 | 13 |
| 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/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"}]` |
| security.disclosure_policy | yes | - |
| security.scorecard | 7.5 | 6.6 |
| 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":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=eslint&per_page=100","last_12m":1,"max_severity":"MODERATE"}` |

## Capabilities (Code Quality Tools)

| Capability | Black | ESLint |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Formatter | Linter + formatter |
| Language scope | Single-language | Single-language |
| Implementation language | Python | JavaScript |
| **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 2026-10-16T19:28:18.160Z. "-" = undocumented, not absent.*