# Black vs Qlty

**Leader by vioscaleAI score:** Black

| Attribute | Black | Qlty |
|---|---|---|
| **vioscaleAI score** | 73.9 (77% (high)) | 53.9 (49% (low)) |
| activity.commits_last_30d | 75 | 45 |
| adoption.dependent_repos | 105,588 | 0 |
| adoption.github_stars | 41,918 | 3,186 |
| 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":"A code quality platform that automatically analyzes pull requests for linting, formatting, security issues, and code coverage with AI-generated fixes. Supports 40+ languages and integrates with GitHub, IDEs, and CI systems. It is indexed under Code Quality Tools.","source":"https://qlty.sh/pricing","question":"What is Qlty?","confidence":0.6},{"answer":"Qlty offers a free tier, so you can start without paying. Paid plans start at $20 per contributor per month. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://qlty.sh/pricing","question":"Is Qlty free?","confidence":0.6},{"answer":"Qlty supports the web, Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://qlty.sh/pricing","question":"What platforms does Qlty support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Qlty, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://qlty.sh/pricing","question":"Can Qlty be self-hosted?","confidence":0.6},{"answer":"We have confirmed 5 integrations for Qlty, including GitHub, Visual Studio Code, CircleCI, Chrome and Firefox. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://qlty.sh/pricing","question":"What does Qlty integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 for Qlty. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Qlty not holding them. Always confirm compliance directly before you rely on it.","source":"https://qlty.sh/pricing","question":"What security certifications does Qlty have?","confidence":0.6},{"answer":"Qlty is available worldwide. Its primary market is the United States.","source":"https://qlty.sh/pricing","question":"Where is Qlty available?","confidence":0.5}]` |
| deployment.options | `{"self_hosted":true}` | `{"cloud":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. | A code quality and coverage platform combining linting, auto-formatting, security scanning, duplication detection, and code coverage analysis with AI-powered fix suggestions, deployed as a cloud service with a local CLI. |
| 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":"quality_platform","ci_gating":true,"deployment":"both","incremental":true,"open_source":"open_core","config_model":"config_file","custom_rules":true,"impl_language":"Rust","pricing_model":"per_contributor","language_scope":"multi_language","editor_integration":true}` |
| integrations.count | 5 | 6 |
| 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":"GitHub"},{"name":"Visual Studio Code"},{"name":"GitHub Actions"},{"name":"CircleCI"},{"name":"Chrome"},{"name":"Firefox"}]` |
| language.primary | Python | C |
| license.spdx | MIT | - |
| market.availability | - | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"linux":true,"windows":true}` | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":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":"hybrid","plans":[{"free":true,"name":"Free","summary":"Free","features":["Linting & auto-formatting","Code coverage","Maintainability & duplication","Open, extensible Rust CLI","Unlimited private/public contributors","Community support"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Linting, auto-formatting, and code coverage with Rust CLI","contactSales":false,"includedLimits":{"ai_autofixes":"100/month","analysis_minutes":"1,000/month"}},{"free":false,"name":"Pro","summary":"$20/contributor/month","features":["Everything from Free","Shared configurations","Trends & hotspots","One year of history","Accelerated analysis","Security scanning (SAST, SCA)","Secrets scanning","Infrastructure as Code (IaC) security","Custom checks","REST API","Monorepo support","Analytics & Reporting","GitHub single sign-on (SSO)","Email support","Web-based support"],"components":[{"kind":"per_unit","unit":"contributor","amount":20,"period":"month","currency":"USD"}],"description":"Complete code quality platform with advanced analytics and support","contactSales":false,"includedLimits":{"ai_autofixes":"5,000/month","analysis_minutes":"20,000/month"}},{"free":false,"name":"Enterprise","summary":"$30/contributor/month (minimum $10k/year for annual invoicing)","features":["Everything from Pro","Advanced analytics","Organization policies","Custom permissions","Audit logs","SOC 2 Type II certification","Priority support with SLA","Uptime SLA","Named account manager","Consolidated billing","Invoiced billing"],"components":[{"kind":"per_unit","unit":"contributor","amount":30,"period":"month","currency":"USD"}],"description":"Advanced platform with organization controls, priority support, and custom terms","contactSales":true,"includedLimits":{"ai_autofixes":"75,000/month","analysis_minutes":"75,000/month"}}],"addOns":[{"name":"Additional analysis minutes","components":[{"per":{"qty":1,"unit":"analysis_minute"},"kind":"metered","amount":0.01,"currency":"USD"}]}],"summary":"Free plan available. Pro from $20/contributor/month. Enterprise $30/contributor/month with volume discounts (5% off 100+ seats, 10% off 200+ seats annually).","currency":"USD","freeTier":true,"sourceUrl":"https://qlty.sh/pricing","retrievedAt":"2026-10-14T21:32:52.231Z","startingPrice":{"unit":"contributor","amount":20,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | free | freemium |
| pricing.price_level | free | mid |
| pricing.starting_price | - | `{"amount":20,"currency":"USD"}` |
| pricing.transparent | yes | yes |
| release.cadence_days | 31 | 2 |
| 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/qltysh/qlty/releases/tag/v0.654.0","date":"2026-10-13T03:22:30Z","type":"stable","version":"v0.654.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.653.0","date":"2026-10-08T23:08:27Z","type":"stable","version":"v0.653.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.652.0","date":"2026-10-06T12:45:09Z","type":"stable","version":"v0.652.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.651.0","date":"2026-10-01T16:52:46Z","type":"stable","version":"v0.651.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.650.0","date":"2026-09-30T18:29:14Z","type":"stable","version":"v0.650.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.649.0","date":"2026-09-26T19:36:10Z","type":"stable","version":"v0.649.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.648.0","date":"2026-09-25T21:01:31Z","type":"stable","version":"v0.648.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.646.0","date":"2026-09-25T18:59:52Z","type":"stable","version":"v0.646.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.645.0","date":"2026-09-23T20:12:00Z","type":"stable","version":"v0.645.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.644.0","date":"2026-08-28T20:39:51Z","type":"stable","version":"v0.644.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.643.0","date":"2026-08-22T00:41:59Z","type":"stable","version":"v0.643.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.642.0","date":"2026-08-14T21:22:17Z","type":"stable","version":"v0.642.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.641.0","date":"2026-08-03T21:23:53Z","type":"stable","version":"v0.641.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.640.0","date":"2026-07-28T18:38:45Z","type":"stable","version":"v0.640.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.639.0","date":"2026-07-23T21:03:00Z","type":"stable","version":"v0.639.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.638.0","date":"2026-07-22T18:48:37Z","type":"stable","version":"v0.638.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.637.0","date":"2026-07-21T22:17:30Z","type":"stable","version":"v0.637.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.636.0","date":"2026-07-20T15:35:09Z","type":"stable","version":"v0.636.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.635.0","date":"2026-07-17T15:50:51Z","type":"stable","version":"v0.635.0"},{"url":"https://github.com/qltysh/qlty/releases/tag/v0.634.0","date":"2026-07-15T19:45:17Z","type":"stable","version":"v0.634.0"}]` |
| reliability.status_page | - | yes |
| security.certifications | - | `[{"name":"SOC 2 Type II","level":"Type II","status":"active"}]` |
| security.disclosure_policy | yes | - |
| security.scorecard | 7.5 | - |
| security.soc2 | - | yes |
| 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=cargo&package_name=qlty-llm&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Code Quality Tools)

| Capability | Black | Qlty |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Formatter | Quality platform |
| Language scope | Single-language | Multi-language |
| Implementation language | Python | Rust |
| **Capability** |  |  |
| Autofix | ✓ | ✓ |
| **Config** |  |  |
| Config model | Zero-config | Config file |
| **Extensibility** |  |  |
| Custom rules | ✗ | ✓ |
| **Deployment** |  |  |
| Deployment | Both | Both |
| **Delivery** |  |  |
| Editor integration | ✓ | ✓ |
| CI / VCS gating | ✓ | ✓ |
| **Insight** |  |  |
| Code metrics | ✗ | ✓ |
| **Performance** |  |  |
| Incremental / monorepo aware | ✗ | ✓ |
| **Licensing** |  |  |
| Open-source | OSS | Open-core |
| **Commercial** |  |  |
| Pricing model | Free | Per-contributor |

*Source: vioscaleAI. Generated 2026-10-16T20:58:21.638Z. "-" = undocumented, not absent.*