# Qlty vs Ruff

**Leader by vioscaleAI score:** Ruff

| Attribute | Qlty | Ruff |
|---|---|---|
| **vioscaleAI score** | 53.9 (49% (low)) | 72.5 (68% (medium)) |
| activity.commits_last_30d | 45 | 100 |
| adoption.dependent_repos | 0 | 5,870 |
| adoption.github_stars | 3,186 | 49,914 |
| adoption.package_downloads_weekly | - | 77,677,334 |
| content.faq | `[{"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}]` | `[{"answer":"A fast Python linter built in Rust that consolidates multiple linting tools into a single interface. It supports over 500 rules, provides automated fixes for common issues, and runs significantly faster than traditional Python linters on even very large codebases. It is indexed under Code Quality Tools.","source":"https://astral.sh/ruff","question":"What is Ruff?","confidence":0.6},{"answer":"Ruff supports Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://astral.sh/ruff","question":"What platforms does Ruff support?","confidence":0.6},{"answer":"Yes. Ruff can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://astral.sh/ruff","question":"Can Ruff be self-hosted?","confidence":0.6},{"answer":"We have confirmed 6 integrations for Ruff, including Flake8, isort, Autoflake, Pyflakes, pycodestyle and Pylint. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://astral.sh/ruff","question":"What does Ruff integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Ruff. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Ruff not holding them. Always confirm compliance directly before you rely on it.","source":"https://astral.sh/legal/privacy","question":"What security certifications does Ruff have?","confidence":0.7},{"answer":"Yes. Ruff 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/astral-sh/ruff","question":"Is Ruff open source?","confidence":0.95},{"answer":"Ruff is available worldwide. Its primary market is the United States. The vendor is headquartered in the United States.","source":"https://astral.sh/ruff","question":"Where is Ruff available?","confidence":0.75}]` |
| deployment.options | `{"cloud":true}` | `{"self_hosted":true}` |
| description.long | 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. | A tool for analyzing and formatting Python code, designed to be fast and efficient through Rust implementation, with support across multiple platforms. |
| features.capabilities | `{"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}` | `{"autofix":true,"function":"linter","deployment":"cli_local","incremental":true,"open_source":"oss","impl_language":"Rust","pricing_model":"free","language_scope":"single_language","editor_integration":true}` |
| integrations.count | 6 | 6 |
| integrations.list | `[{"name":"GitHub"},{"name":"Visual Studio Code"},{"name":"GitHub Actions"},{"name":"CircleCI"},{"name":"Chrome"},{"name":"Firefox"}]` | `[{"name":"Flake8"},{"name":"isort"},{"name":"Autoflake"},{"name":"Pyflakes"},{"name":"pycodestyle"},{"name":"Pylint"},{"name":"Visual Studio Code","native":false,"category":"editor","direction":"outbound"}]` |
| language.primary | C | Rust |
| license.spdx | - | MIT |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":true}` | `{"cli":true,"mac":true,"linux":true,"windows":true}` |
| pricing | `{"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 | - |
| pricing.model | freemium | commercial |
| pricing.price_level | mid | - |
| pricing.starting_price | `{"amount":20,"currency":"USD"}` | - |
| pricing.transparent | yes | - |
| release.cadence_days | 2 | 7 |
| release.history | 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| `[{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.10","date":"2026-10-01T18:04:27Z","type":"stable","version":"0.16.10"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.9","date":"2026-09-24T20:38:52Z","type":"stable","version":"0.16.9"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.8","date":"2026-09-16T15:56:22Z","type":"stable","version":"0.16.8"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.7","date":"2026-09-10T18:05:06Z","type":"stable","version":"0.16.7"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.6","date":"2026-09-03T17:20:13Z","type":"stable","version":"0.16.6"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.5","date":"2026-08-27T16:37:58Z","type":"stable","version":"0.16.5"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.4","date":"2026-08-20T17:44:56Z","type":"stable","version":"0.16.4"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.3","date":"2026-08-13T15:18:05Z","type":"stable","version":"0.16.3"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.2","date":"2026-08-07T13:31:55Z","type":"stable","version":"0.16.2"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.1","date":"2026-07-30T19:37:52Z","type":"stable","version":"0.16.1"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.16.0","date":"2026-07-23T19:12:22Z","type":"stable","version":"0.16.0"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.22","date":"2026-07-16T15:15:10Z","type":"stable","version":"0.15.22"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.21","date":"2026-07-09T20:02:30Z","type":"stable","version":"0.15.21"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.20","date":"2026-06-25T17:21:46Z","type":"stable","version":"0.15.20"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.19","date":"2026-06-24T01:11:40Z","type":"stable","version":"0.15.19"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.18","date":"2026-06-18T18:26:34Z","type":"stable","version":"0.15.18"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.17","date":"2026-06-11T17:57:00Z","type":"stable","version":"0.15.17"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.16","date":"2026-06-04T16:34:11Z","type":"stable","version":"0.15.16"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.15","date":"2026-05-28T14:18:02Z","type":"stable","version":"0.15.15"},{"url":"https://github.com/astral-sh/ruff/releases/tag/0.15.14","date":"2026-05-21T14:35:54Z","type":"stable","version":"0.15.14"}]` |
| reliability.status_page | yes | - |
| security.certifications | `[{"name":"SOC 2 Type II","level":"Type II","status":"active"}]` | - |
| security.gdpr | - | yes |
| security.soc2 | yes | - |
| security.vulnerabilities | `{"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}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=ruff&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Code Quality Tools)

| Capability | Qlty | Ruff |
|---|:--:|:--:|
| **Core** |  |  |
| Function | Quality platform | Linter |
| Language scope | Multi-language | Single-language |
| Implementation language | Rust | Rust |
| **Capability** |  |  |
| Autofix | ✓ | ✓ |
| **Config** |  |  |
| Config model | 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 | Open-core | OSS |
| **Commercial** |  |  |
| Pricing model | Per-contributor | Free |

*Source: vioscaleAI. Generated 2026-10-16T20:58:07.112Z. "-" = undocumented, not absent.*